Release Notes

v5.25.0 (2021-11-19)


  • Support for w3.eth.get_raw_transaction_by_block, and async support for w3.eth.get_raw_transaction_by_block (#2209)


  • BadResponseFormat error thrown instead of KeyError when a response gets sent back without a result key. (#2188)

Improved Documentation

  • Correct link to Websocket library documentation (#2173)

  • Doc update to make it clearer that enable_unstable_package_management() method is on the web3 instance (#2208)

v5.24.0 (2021-09-27)


  • Add async eth.send_raw_transaction method (#2135)

  • Updated eth-account version to v0.5.6 - adds support for signing typed transactions without needing to explicitly set the transaction type and now accepts correct JSON-RPC structure for accessList for typed transactions (#2157)


  • Encode block_count as hex before making eth_feeHistory RPC call (#2117)

Improved Documentation

  • Fix typo in AsyncHTTPProvider docs (#2131)

  • Update AsyncHTTPProvider doc Supported Methods to include web3.eth.send_raw_transaction(). (#2135)

  • Improve messaging around usage and implementation questions, directing users to the appropriate channel (#2138)

  • Clarify some contract ValueError error messages. (#2146)

  • Updated docs for w3.eth.account.sign_transaction to reflect that transaction type is no longer needed to successfully sign typed transactions and to illustrate how to structure an optional accessList parameter in a typed transaction (#2157)


v5.23.1 (2021-08-27)


  • Add constants for the zero address, zero hash, max int, and wei per ether. (#2109)

Improved Documentation

  • Renamed “1559 transaction” to “dynamic fee transaction” where appropriate to keep consistency among the general code base for 1559 transaction (type=2) naming (#2118)

  • Update AsyncHTTPProvider doc example to include modules and middlewares keyword arguments (#2123)

v5.23.0 (2021-08-12)


  • Add support for eth_feeHistory RPC method (#2038)

  • Add support for eth_maxPriorityFeePerGas RPC method (#2100)


  • Hot fix for string interpolation issue with contract function call decoding exception to facilitate extracting a meaningful message from the eth_call response (#2096)

  • Bypass adding a gasPrice via the gas price strategy, if one is set, when EIP-1559 transaction params are used for send_transaction (#2099)

Improved Documentation

  • Update feeHistory docs (#2104)

v5.22.0 (2021-08-02)


  • Add support for eth_getRawTransactionByHash RPC method (#2039)

  • Add AsyncNet module (#2044)

  • Add async eth.get_balance, eth.get_code, eth.get_transaction_count methods. (#2056)

  • eth_signTransaction support for eip-1559 params ‘maxFeePerGas’ and ‘maxPriorityFeePerGas’ (#2082)

  • Add support for async (#2083)


  • If a transaction hash was passed as a string rather than a HexByte to w3.eth.wait_for_transaction_receipt, and the time was exhausted before the transaction is in the chain, the error being raised was a TypeError instead of the correct TimeExhausted error. This is because the to_hex method in the TimeExhausted error message expects a primitive as the first argument, and a string doesn’t qualify as a primitive. Fixed by converting the transaction_hash to HexBytes instead. (#2068)

  • Hot fix for a string interpolation issue in message when BadFunctionCallOutput is raised for call_contract_function() (#2069)

  • fill_transaction_defaults() no longer sets a default gasPrice if 1559 fees are present in the transaction parameters. This fixes sign-and-send middleware issues with 1559 fees. (#2092)

Improved Documentation

  • Clarify that send_transaction, modify_transaction, and replace_transaction return HexByte objects instead of strings. (#2058)

  • Added troubleshooting section for Microsoft Visual C++ error on Windows machines (#2077)

  • Updated the sign-and-send middleware docs to include EIP-1559 as well as legacy transaction examples (#2092)

v5.21.0 (2021-07-12)


  • Adds support for EIP 1559 transaction keys: maxFeePerGas and maxPriorityFeePerGas (#2060)


  • Bugfix where an error response got passed to a function expecting a block identifier.

    Split out null result formatters from the error formatters and added some tests. (#2022)

  • Fix broken tests and use the new 1559 params for most of our test transactions. (#2053)

  • Set a default maxFeePerGas value consistent with Geth (#2055)

  • Fix bug in geth PoA middleware where a None response should throw a BlockNotFound error, but was instead throwing an AttributeError (#2064)

Improved Documentation

  • Added general documentation on unit and integration testing and how to contribute to our test suite. (#2053)

v5.20.1 (2021-07-01)


  • Have the geth dev IPC auto connection check for the WEB3_PROVIDER_URI environment variable. (#2023)

Improved Documentation

  • Remove reference to allowing multiple providers in docs (#2018)

  • Update “Contract Deployment Example” docs to use py-solc-x as solc is no longer maintained. (#2020)

  • Detail using unreleased Geth builds in CI (#2037)

  • Clarify that a missing trie node error could occur when using block_identifier with .call() on a node that isn’t running in archive mode (#2048)

v5.20.0 (2021-06-09)


  • Add new AsyncHTTPProvider. No middleware or session caching support yet.

    Also adds async w3.eth.gas_price, and async w3.isConnected() methods. (#1978)

  • Add ability for AsyncHTTPProvider to accept middleware

    Also adds async gas_price_strategy middleware, and moves gas estimate to middleware.

    AsyncEthereumTesterProvider now inherits from AsyncBase (#1999)

  • Support state_override in contract function call. (#2005)


  • Test ethpm caching + bump Sphinx version. (#1977)

Improved Documentation

  • Clarify solidityKeccak documentation. (#1971)

  • Improve contributor documentation context and ordering. (#2008)

  • Add docs for unstable AsyncHTTPProvider (#2017)

v5.19.0 (2021-04-28)


  • Handle optional eth_call state override param. (#1921)

  • Add list_storage_keys deprecate listStorageKeys (#1944)

  • Add net_peers deprecate netPeers (#1946)

  • Add trace_replay_transaction deprecate traceReplayTransaction (#1949)

  • Add add_reserved_peer deprecate addReservedPeer (#1951)

  • Add parity.set_mode, deprecate parity.setMode (#1954)

  • Add parity.trace_raw_transaction, deprecate parity.traceRawTransaction (#1955)

  • Add parity.trace_call, deprecate parity.traceCall (#1957)

  • Add trace_filter deprecate traceFilter (#1960)

  • Add trace_block, deprecate traceBlock (#1961)

  • Add trace_replay_block_transactions, deprecate traceReplayBlockTransactions (#1962)

  • Add parity.trace_transaction, deprecate parity.traceTransaction (#1963)

Improved Documentation

  • Document eth_call state overrides. (#1965)

v5.18.0 (2021-04-08)


  • Add w3.eth.modify_transaction deprecate w3.eth.modifyTransaction (#1886)

  • Add w3.eth.get_transaction_receipt, deprecate w3.eth.getTransactionReceipt (#1893)

  • Add w3.eth.wait_for_transaction_receipt deprecate w3.eth.waitForTransactionReceipt (#1896)

  • Add w3.eth.set_contract_factory deprecate w3.eth.setContractFactory (#1900)

  • Add w3.eth.generate_gas_price deprecate w3.eth.generateGasPrice (#1905)

  • Add w3.eth.set_gas_price_strategy deprecate w3.eth.setGasPriceStrategy (#1906)

  • Add w3.eth.estimate_gas deprecate w3.eth.estimateGas (#1913)

  • Add w3.eth.sign_typed_data deprecate w3.eth.signTypedData (#1915)

  • Add w3.eth.get_filter_changes deprecate w3.eth.getFilterChanges (#1916)

  • Add eth.get_filter_logs, deprecate eth.getFilterLogs (#1919)

  • Add eth.uninstall_filter, deprecate eth.uninstallFilter (#1920)

  • Add w3.eth.get_logs deprecate w3.eth.getLogs (#1925)

  • Add w3.eth.submit_hashrate deprecate w3.eth.submitHashrate (#1926)

  • Add w3.eth.submit_work deprecate w3.eth.submitWork (#1927)

  • Add w3.eth.get_work, deprecate w3.eth.getWork (#1934)

  • Adds public get_block_number method. (#1937)

Improved Documentation

  • Add ABI type examples to docs (#1890)

  • Promote the new Ethereum Python Discord server on the README. (#1898)

  • Escape reserved characters in install script of Contributing docs. (#1909)

  • Add detailed event filtering examples. (#1910)

  • Add docs example for tuning log levels. (#1928)

  • Add some performance tips in troubleshooting docs. (#1929)

  • Add existing contract interaction to docs examples. (#1933)

  • Replace Gitter links with the Python Discord server. (#1936)

v5.17.0 (2021-02-24)


  • Added get_transaction_count, and deprecated getTransactionCount (#1844)

  • Add w3.eth.send_transaction, deprecate w3.eth.sendTransaction (#1878)

  • Add web3.eth.sign_transaction, deprecate web3.eth.signTransaction (#1879)

  • Add w3.eth.send_raw_transaction, deprecate w3.eth.sendRawTransaction (#1880)

  • Add w3.eth.replace_transaction deprecate w3.eth.replaceTransaction (#1882)

Improved Documentation

  • Fix return type of send_transaction in docs. (#686)

v5.16.0 (2021-02-04)


  • Added get_block_transaction_count, and deprecated getBlockTransactionCount (#1841)

  • Move defaultAccount to default_account. Deprecate defaultAccount. (#1848)

  • Add eth.default_block, deprecate eth.defaultBlock. Also adds parity.default_block, and deprecates parity.defaultBlock. (#1849)

  • Add eth.gas_price, deprecate eth.gasPrice (#1850)

  • Added eth.block_number property. Deprecated eth.blockNumber (#1851)

  • Add eth.chain_id, deprecate eth.chainId (#1852)

  • Add eth.protocol_version, deprecate eth.protocolVersion (#1853)

  • Add eth.get_code, deprecate eth.getCode (#1856)

  • Deprecate eth.getProof, add eth.get_proof (#1857)

  • Add eth.get_transaction, deprecate eth.getTransaction (#1858)

  • Add eth.get_transaction_by_block, deprecate eth.getTransactionByBlock (#1859)

  • Add get_uncle_by_block, deprecate getUncleByBlock (#1862)

  • Add get_uncle_count, deprecate getUncleCount (#1863)


  • Fix event filter creation if the event ABI contains a values key. (#1807)

Improved Documentation

  • Remove v5 breaking changes link from the top of the release notes. (#1837)

  • Add account creation troubleshooting docs. (#1855)

  • Document passing a struct into a contract function. (#1860)

  • Add instance configuration troubleshooting docs. (#1865)

  • Clarify nonce lookup in sendRawTransaction docs. (#1866)

  • Updated docs for web3.eth methods: eth.getTransactionReceipt and eth.waitForTransactionReceipt (#1868)

v5.15.0 (2021-01-15)


  • Add get_storage_at method and deprecate getStorageAt. (#1828)

  • Add eth.get_block method and deprecate eth.getBlock. (#1829)


  • PR #1585 changed the error that was coming back from eth-tester when the Revert opcode was called, which broke some tests in downstream libraries. This PR reverts back to raising the original error. (#1813)

  • Added a new ContractLogicError for when a contract reverts a transaction. ContractLogicError will replace SolidityError, in v6. (#1814)

Improved Documentation

  • Introduce Beacon API documentation (#1836)

v5.14.0 (2021-01-05)


  • Remove docs/web3.* from the gitignore to allow for the beacon docs to be added to git, and add beacon to the default web3 modules that get loaded. (#1824)

  • Remove auto-documenting from the Beacon API (#1825)


  • Introduce experimental Ethereum 2.0 beacon node API (#1758)

  • Add new get_balance method on Eth class. Deprecated getBalance. (#1806)


v5.13.1 (2020-12-03)


  • Handle revert reason parsing for Ganache (#1794)

Improved Documentation

  • Document Geth and Parity/OpenEthereum fixture generation (#1787)

v5.13.0 (2020-10-29)


  • Raise SolidityError exceptions that contain the revert reason when a call fails. (#941)


  • Update eth-tester dependency to fix tester environment install version conflict. (#1782)


v5.12.3 (2020-10-21)

v5.12.2 (2020-10-12)


  • Address the use of multiple providers in the docs (#1701)

  • Remove stale connection errors from docs (#1737)

  • Allow ENS name resolution for methods that use the Method class (#1749)

v5.12.1 (2020-09-02)

v5.12.0 (2020-07-16)


  • Update and ethpm module to EthPM v3 specification. (#1652)

  • Allow consumer to initialize HttpProvider with their own requests.Session. This allows the HttpAdapter connection pool to be tuned as desired. (#1469)

Improved Documentation

  • Use ethpm v3 packages in examples documentation. (#1683)

  • Modernize the deploy contract example. (#1679)

  • Add contribution guidelines and a code of conduct. (#1691)


v5.12.0-beta.3 (2020-07-15)


  • Include ethpm-spec solidity examples in distribution. (#1686)

v5.12.0-beta.2 (2020-07-14)


  • Support ethpm-spec submodule in distributions. (#1682)

Improved Documentation

  • Modernize the deploy contract example. (#1679)

  • Use ethpm v3 packages in examples documentation. (#1683)

v5.12.0-beta.1 (2020-07-09)


  • Allow consumer to initialize HttpProvider with their own requests.Session. This allows the HttpAdapter connection pool to be tuned as desired. (#1469)

  • Update and ethpm module to EthPM v3 specification. (#1652)


  • Update outdated reference url in ethpm docs and tests. (#1680)

Improved Documentation

  • Add a getBalance() example and provide more context for using the fromWei and toWei utility methods. (#1676)

  • Overhaul the Overview documentation to provide a tour of major features. (#1681)

v5.11.1 (2020-06-17)


  • Added formatter rules for eth_tester middleware to allow getBalance() by using integer block numbers (#1660)

  • Fix type annotations within the module. Several arguments that defaulted to None were not declared Optional. (#1668)

  • Fix type annotation warning when using string URI to instantiate an HTTP or WebsocketProvider. (#1669)

  • Fix type annotations within the web3 modules. Several arguments that defaulted to None were not declared Optional. (#1670)

Improved Documentation

  • Breaks up links into three categories (Intro, Guides, and API) and adds content to the index page: a lib introduction and some “Getting Started” links. (#1671)

  • Fills in some gaps in the Quickstart guide and adds provider connection details for local nodes. (#1673)

v5.11.0 (2020-06-03)


  • Accept a block identifier in the Contract.estimateGas method. Includes a related upgrade of eth-tester to v0.5.0-beta.1. (#1639)

  • Introduce a more specific validation error, ExtraDataLengthError. This enables tools to detect when someone may be connected to a POA network, for example, and provide a smoother developer experience. (#1666)


  • Correct the type annotations of FilterParams.address (#1664)

Improved Documentation

  • Corrects the return value of getTransactionReceipt, description of caching middleware, and deprecated method names. (#1663)

  • Corrects documentation of websocket timeout configuration. (#1665)

v5.10.0 (2020-05-18)


  • An update of eth-tester includes a change of the default fork from Constantinople to Muir Glacier. #1636


  • was incorrectly annotated so that MyEvent was marked as a ContractEvent instance. Fixed to be a class type, i.e., Type[ContractEvent]. (#1646)

  • IPCProvider correctly handled pathlib.Path input, but warned against its type. Fixed to permit Path objects in addition to strings. (#1647)


v5.9.0 (2020-04-30)


  • Upgrade eth-account to use v0.5.2+. eth-account 0.5.2 adds support for hd accounts

    Also had to pin eth-keys to get dependencies to resolve. (#1622)


  • Fix local_filter_middleware new entries bug (#1514)

  • ENS name and ENS address can return None. Fixes return types. (#1633)

v5.8.0 (2020-04-23)


  • Introduced list_wallets method to the GethPersonal class. (#1516)

  • Added block_identifier parameter to ContractConstructor.estimateGas method. (#1588)

  • Add snake_case methods to Geth and Parity Personal Modules.

    Deprecate camelCase methods. (#1589)

  • Added new weighted keyword argument to the time based gas price strategy.

    If True, it will more give more weight to more recent block times. (#1614)

  • Adds support for Solidity’s new(ish) receive function.

    Adds a new contract API that mirrors the existing fallback API: contract.receive (#1623)


  • Fixed hasattr overloader method in the web3.ContractEvent, web3.ContractFunction, and web3.ContractCaller classes by implementing a try/except handler that returns False if an exception is raised in the __getattr__ overloader method (since __getattr__ HAS to be called in every __hasattr__ call).

    Created two new Exception classes, ‘ABIEventFunctionNotFound’ and ‘ABIFunctionNotFound’, which inherit from both AttributeError and MismatchedABI, and replaced the MismatchedABI raises in ContractEvent, ContractFunction, and ContractCaller with a raise to the created class in the __getattr__ overloader method of the object. (#1594)

  • Change return type of rpc_gas_price_strategy from int to Wei (#1612)

Improved Documentation

  • Fix typo in “Internals” docs. Changed asyncronous –> asynchronous (#1607)

  • Improve documentation that introduces and troubleshoots Providers. (#1609)

  • Add documentation for when to use each transaction method. (#1610)

  • Remove incorrect web3 for w3 in doc example (#1615)

  • Add examples for using web3.contract via the ethpm module. (#1617)

  • Add dark mode to documentation. Also fixes a bunch of formatting issues in docs. (#1626)


v5.7.0 (2020-03-16)


  • Add snake_case methods for the net module

    Also moved net module to use ModuleV2 instead of Module (#1592)


  • Fix return type of eth_getCode. Changed from Hexstr to HexBytes. (#1601)


v5.6.0 (2020-02-26)


  • Add snake_case methods to Geth Miner class, deprecate camelCase methods (#1579)

  • Add snake_case methods for the net module, deprecate camelCase methods (#1581)

  • Add PEP561 type marker (#1583)


  • Increase replacement tx minimum gas price bump

    Parity/OpenEthereum requires a replacement transaction’s gas to be a minimum of 12.5% higher than the original (vs. Geth’s 10%). (#1570)

v5.5.1 (2020-02-10)

Improved Documentation

  • Documents the getUncleCount method. (#1534)


v5.5.0 (2020-02-03)


  • ENS had to release a new registry to push a bugfix. See this article for background information. uses the new registry for all default ENS interactions, now. (#1573)


  • Minor bugfix in how ContractCaller looks up abi functions. (#1552)

  • Update modules to use compatible typing-extensions import. (#1554)

  • Make ‘from’ and ‘to’ fields checksum addresses in returned transaction receipts (#1562)

  • Use local Trinity’s IPC socket if it is available, for newer versions of Trinity. (#1563)

Improved Documentation

  • Add Matomo Tracking to Docs site.

    Matomo is an Open Source web analytics platform that allows us to get better insights and optimize for our audience without the negative consequences of other compareable platforms.

    Read more: (#1541)

  • Fix web3 typo in docs (#1559)

v5.4.0 (2019-12-06)


  • Add __str__ to IPCProvider (#1536)


  • Add required typing-extensions library to (#1544)

v5.3.1 (2019-12-05)


  • Only apply hexbytes formatting to r and s values in transaction if present (#1531)

  • Update eth-utils dependency which contains mypy bugfix. (#1537)

Improved Documentation

  • Update Contract Event documentation to show correct example (#1515)

  • Add documentation to methods that raise an error in v5 instead of returning None (#1527)


v5.3.0 (2019-11-14)


  • Support handling ENS domains in ERC1319 URIs. (#1489)


  • Make local block filter return empty list when when no blocks mined (#1255)

  • Google protobuf dependency was updated to 3.10.0 (#1493)

  • Infura websocket provider works when no secret key is present (#1501)

Improved Documentation

  • Update Quickstart instructions to use the auto Infura module instead of the more complicated web3 auto module (#1482)

  • Remove outdated py.test command from readme (#1483)

v5.2.2 (2019-10-21)


  • Add poll_latency to waitForTransactionReceipt (#1453)


  • Fix flaky Parity whisper module test (#1473)


v5.2.1 (2019-10-17)

Improved Documentation

  • Update documentation for unlock account duration (#1464)

  • Clarify module installation command for OSX>=10.15 (#1467)


v5.2.0 (2019-09-26)


  • Add enable_strict_bytes_type_checking flag to web3 instance (#1419)

  • Move Geth Whisper methods to snake case and deprecate camel case methods (#1433)


  • Add null check to logsbloom formatter (#1445)

Improved Documentation

  • Reformat autogenerated towncrier release notes (#1460)

Web3 5.1.0 (2019-09-18)


  • Add contract_types property to Package class. (#1440)


  • Fix flaky parity integration test in the whisper module (#1147)

Improved Documentation

  • Remove whitespace, move topics key -> topic in Geth docs (#1425)

  • Enforce stricter doc checking, turning warnings into errors to fail CI builds to catch issues quickly.

    Add missing to the table of contents and fix incorrectly formatted JSON example. (#1437)

  • Add example using Geth POA Middleware with Infura Rinkeby Node (#1444)



Released August 22, 2019

  • Bugfixes

    • [ethPM] Fix bug in package id and release id fetching strategy - #1427


Released August 15, 2019

  • Bugfixes

    • [ethPM] Add begin/close chars to package name regex - #1418

    • [ethPM] Update deployments to work when only abi available - #1417

    • Fix tuples handled incorrectly in decode_function_input - #1410

  • Misc

    • Eliminate signTransaction warning - #1404


Released August 1, 2019

  • Features

    • web3.eth.chainId now returns an integer instead of hex - #1394

  • Bugfixes

    • Deprecation Warnings now show for methods that have a @combomethod decorator - #1401

  • Misc

    • [ethPM] Add ethPM to the docker file - #1405

  • Docs

    • Docs are updated to use checksummed addresses - #1390

    • Minor doc formatting fixes - #1338 & #1345


Released July 31, 2019

This is intended to be the final release before the stable v5 release.

  • Features

    • Parity operating mode can be read and set - #1355

    • Process a single event log, instead of a whole transaction receipt - #1354

  • Docs

    • Remove doctest dependency on ethtoken - #1395

  • Bugfixes

    • [ethPM] Bypass IPFS validation for large files - #1393

  • Misc

    • [ethPM] Update default Registry solidity contract - #1400

    • [ethPM] Update to use new simple Registry implementation - #1398

    • Update dependency requirement formatting for releasing - #1403


Released July 18,2019

  • Features

    • [ethPM] Update registry uri to support basic uris w/o package id - #1389

  • Docs

    • Clarify in docs the return of Eth.sendRawTransaction() as a HexBytes object, not a string. - #1384

  • Misc

    • [ethPM] Migrate tests over from pytest-ethereum - #1385


Released July 15, 2019

  • Features

    • Add eth_getProof support - #1185

    • Implement - #1372

    • Update registry URIs to support chain IDs - #1382

    • Add error flags to event.processReceipt - #1366

  • Bugfixes

    • Remove full IDNA processing in favor of UTS46 - #1364

  • Misc

    • Migrate py-ethpm library to web3/ethpm - #1379

    • Relax canonical address requirement in ethPM - #1380

    • Replace ethPM’s infura strategy with web3’s native infura support - #1383

    • Change combine_argument_formatters to apply_formatters_to_sequence - #1360

    • Move pytest.xfail instances to @pytest.mark.xfail - #1376

    • Change net.version to eth.chainId in default transaction params - #1378


Released May 13, 2019

  • Features

    • Mark deprecated sha3 method as static - #1350

    • Upgrade to eth-account v0.4.0 - #1348

  • Docs

    • Add note about web3[tester] in documentation - #1325

  • Misc

    • Replace web3._utils.toolz imports with eth_utils.toolz - #1317


Released May 6, 2019

  • Features

    • Add support for tilda in provider IPC Path - #1049

    • EIP 712 Signing Supported - #1319

  • Docs

    • Update contract example to use compile_standard - #1263

    • Fix typo in middleware docs - #1339


Released April 24, 2019

  • Docs

    • Add documentation for unit tests - #1324

  • Misc

    • Update deprecated imports - #1334

    • Fix documentation typo - #1335

    • Upgrade eth-tester version - #1332


Released April 15, 2019

  • Features

    • Add getLogs by blockHash - #1269

    • Implement chainId endpoint - #1295

    • Moved non-standard JSON-RPC endpoints to applicable Parity/Geth docs. Deprecated web3.version for web3.api - #1290

    • Moved Whisper endpoints to applicable Geth or Parity namespace - #1308

    • Added support for Goerli provider - #1286

    • Added addReservedPeer to Parity module - #1311

  • Bugfixes

    • Cast gas price values to integers in gas strategies - #1297

    • Missing constructor function no longer ignores constructor args - #1316

  • Misc

    • Require eth-utils >= 1.4, downgrade Go version for integration tests - #1310

    • Fix doc build warnings - #1331

    • Zip Fixture data - #1307

    • Update Geth version for integration tests - #1301

    • Remove unneeded testrpc - #1322

    • Add ContractCaller docs to v5 migration guide - #1323


Released March 26, 2019

  • Breaking Changes

    • Raise error if there is no Infura API Key - #1294 & - #1299

  • Misc

    • Upgraded Parity version for integration testing - #1292


Released March 20, 2019

  • Breaking Changes

    • Removed web3/utils directory in favor of web3/_utils - #1282

    • Relocated personal RPC endpoints to Parity and Geth class - #1211

    • Deprecated, web3.eth.getCompilers(), and web3.eth.getTransactionFromBlock(). Removed web3.eth.enableUnauditedFeatures() - #1270

    • Relocated eth_protocolVersion and web3_clientVersion - #1274

    • Relocated web3.txpool to web3.geth.txpool - #1275

    • Relocated admin module to Geth namespace - #1288

    • Relocated miner module to Geth namespace - #1287

  • Features

    • Implement eth_submitHashrate and eth_submitWork JSONRPC endpoints. - #1280

    • Implement web3.eth.signTransaction - #1277

  • Docs

    • Added v5 migration docs - #1284


Released March 11, 2019

  • Breaking Changes

    • Updated JSON-RPC calls that lookup txs or blocks to raise an error if lookup fails - #1218 and #1268

  • Features

    • Tuple ABI support - #1235

  • Bugfixes

    • One last middleware_stack was still hanging on. Changed to middleware_onion - #1262


Released February 25th, 2019

  • Features

    • New NoABIFound error for cases where there is no ABI - #1247

  • Misc

    • Interact with Infura using an API Key. Key will be required after March 27th. - #1232

    • Remove process_type utility function in favor of eth-abi functionality - #1249


Released February 13th, 2019

  • Breaking Changes

    • Remove deprecated buildTransaction, call, deploy, estimateGas, and transact methods - #1232

  • Features

    • Adds Web3.toJSON method - #1173

    • Contract Caller API Implemented - #1227

    • Add Geth POA middleware to use Rinkeby with Infura Auto - #1234

    • Add manifest and input argument validation to pm.release_package() - #1237

  • Misc

    • Clean up intro and block/tx sections in Filter docs - #1223

    • Remove unnecessary EncodingError exception catching - #1224

    • Improvements to merge_args_and_kwargs utility function - #1228

    • Update vyper registry assets - #1242


Released January 23rd, 2019

  • Breaking Changes

    • Rename middleware_stack to middleware_onion - #1210

    • Drop already deprecated web3.soliditySha3 - #1217

    • ENS: Stop inferring .eth TLD on domain names - #1205

  • Bugfixes

    • Validate ethereum_tester class in EthereumTesterProvider - #1217

    • Support getLogs() method without creating filters - #1192

  • Features

    • Stablize the PM module - #1125

    • Implement async Version module - #1166

  • Misc

    • Update .gitignore to ignore .DS_Store and .mypy_cache/ - #1215

    • Change CircleCI badge link to CircleCI project - #1214


Released January 15th, 2019

  • Breaking Changes

    • Remove web3.miner.hashrate and - #1198

    • Remove web3.providers.tester.EthereumTesterProvider and web3.providers.tester.TestRPCProvider - #1199

    • Change manager.providers from list to single manager.provider - #1200

    • Replace deprecated web3.sha3 method with web3.keccak method - #1207

    • Drop auto detect testnets for IPCProvider - #1206

  • Bugfixes

    • Add check to make sure blockHash exists - #1158

  • Misc

    • Remove some unreachable code in providers/ - #1160

    • Migrate tester provider results from middleware to defaults - #1188

    • Fix doc formatting for build_filter method - #1187

    • Add ERC20 example in docs - #1178

    • Code style improvements - #1194 & #1191

    • Convert Web3 instance variables to w3 - #1186

    • Update eth-utils dependencies and clean up other dependencies - #1195


Released December 20th, 2018

  • Breaking Changes

    • Remove support for python3.5, drop support for eth-abi v1 - #1163

  • Features

    • Support for custom ReleaseManager was fixed - #1165

  • Misc

    • Fix doctest nonsense with unicorn token - 3b2047

    • Docs for installing web3 in FreeBSD - #1156

    • Use latest python in readthedocs - #1162

    • Use twine in release script - #1164

    • Upgrade eth-tester, for eth-abi v2 support - #1168


Released December 13th, 2018

  • Features

    • Add Rinkeby and Kovan Infura networks; made mainnet the default - #1150

    • Add parity-specific listStorageKeys RPC - #1145

    • Deprecated Web3.soliditySha3; use Web3.solidityKeccak instead. - #1139

    • Add default trinity locations to IPC path guesser - #1121

    • Add wss to AutoProvider - #1110

    • Add timeout for WebsocketProvider - #1109

    • Receipt timeout raises TimeExhausted - #1070

    • Allow specification of block number for eth_estimateGas - #1046

  • Misc

    • Removed web3._utils.six support - #1116

    • Upgrade eth-utils to 1.2.0 - #1104

    • Require Python version 3.5.3 or greater - #1095

    • Bump websockets version to 7.0.0 - #1146

    • Bump parity test binary to 1.11.11 - #1064


Released November 15, 2018

  • Misc

    • Reduce unneeded memory usage - #1138


Released October 28, 2018

  • Features

    • Add timeout for WebsocketProvider - #1119

    • Reject transactions that send ether to non-payable contract functions - #1115

    • Add Auto Infura Ropsten support: from import w3 - #1124

    • Auto-detect trinity IPC file location - #1129

  • Misc

    • Require Python >=3.5.3 - #1107

    • Upgrade eth-tester and eth-utils - #1085

    • Configure readthedocs dependencies - #1082

    • soliditySha3 docs fixup - #1100

    • Update ropsten faucet links in troubleshooting docs


Released September 25th, 2018

  • Bugfixes

    • IPC paths starting with ~ are appropriately resolved to the home directory - #1072

    • You can use the local signing middleware with bytes-type addresses - #1069


Released September 11th, 2018

  • Bugfixes

    • old pip bug used during release made it impossible for non-windows users to install 4.7.0.


Released September 10th, 2018

  • Features

    • Add traceFilter method to the parity module. - #1051

    • Move datastructures to public namespace datastructures to improve support for type checking. - #1038

    • Optimization to contract calls - #944

  • Bugfixes

    • ENS name resolution only attempted on mainnet by default. - #1037

    • Fix attribute access error when attributedict middleware is not used. - #1040

  • Misc - Upgrade eth-tester to 0.1.0-beta.32, and remove integration tests for py-ethereum. - Upgrade eth-hash to 0.2.0 with pycryptodome 3.6.6 which resolves a vulnerability.


Released Aug 24, 2018

  • Features

  • Bugfixes

    • Fix crash in time-based gas strategies with small number of transactions - #983

    • Fx crash when passing multiple addresses to w3.eth.getLogs() - #1005

  • Misc

    • Disallow configuring filters with both manual and generated topic lists - #976

    • Add support for the upcoming eth-abi v2, which does ABI string decoding differently - #974

    • Add a lot more filter tests - #997

    • Add more tests for filtering with None. Note that geth & parity differ here. - #985

    • Follow-up on Parity bug that we reported upstream (parity#7816): they resolved in 1.10. We removed xfail on that test. - #992

    • Docs: add an example of interacting with an ERC20 contract - #995

    • A couple doc typo fixes


Released July 30, 2018

  • Features

    • Accept addresses supplied in bytes format (which does not provide checksum validation)

    • Improve estimation of gas prices

  • Bugfixes

  • Misc

    • Test Parity 1.11.7

    • Parity integration tests upgrade to use sha256 instead of md5

    • Fix some filter docs

    • eth-account upgrade to v0.3.0

    • eth-tester upgrade to v0.1.0-beta.29


Released June 29, 2018


Released June 21, 2018

  • Features

    • Add support for https in WEB3_PROVIDER_URI environment variable

    • Can send websocket connection parameters in WebsocketProvider

    • Two new auto-initialization options:

      • from import w3

      • from import w3 (After setting the INFURA_API_KEY environment variable)

    • Alpha support for a new package management tool based on ethpm-spec, see Package Manager API

  • Bugfixes

    • Can now receive large responses in WebsocketProvider by specifying a large max_size in the websocket connection parameters.

  • Misc


Released June 6, 2018

  • Features

    • Support for the ABI types like: fixedMxN which is used by Vyper.

    • In-flight transaction-signing middleware: Use local keys as if they were hosted keys using the new sign_and_send_raw_middleware

    • New getUncleByBlock() API

    • New name getTransactionByBlock(), which replaces the deprecated getTransactionFromBlock()

    • Add several new Parity trace functions

    • New API to resolve ambiguous function calls, for example:

      • Two functions with the same name that accept similar argument types, like myfunc(uint8) and myfunc(int8), and you want to call contract.functions.myfunc(1).call()

      • See how to use it at: Invoke Ambiguous Contract Functions Example

  • Bugfixes

    • Gas estimation doesn’t crash, when 0 blocks are available. (ie~ on the genesis block)

    • Close out all HTTPProvider sessions, to squash warnings on exit

    • Stop adding Contract address twice to the filter. It was making some nodes unhappy

  • Misc

    • Friendlier json encoding/decoding failure error messages

    • Performance improvements, when the responses from the node are large (by reducing the number of times we evaluate if the response is valid json)

    • Parity CI test fixes (ugh, environment setup hell, thanks to the community for cleaning this up!)

    • Don’t crash when requesting a transaction that was created with the parity bug (which allowed an unsigned transaction to be included, so publicKey is None)

    • Doc fixes: addresses must be checksummed (or ENS names on mainnet)

    • Enable local integration testing of parity on non-Debian OS

    • README:

      • Testing setup for devs

      • Change the build badge from Travis to Circle CI

    • Cache the parity binary in Circle CI, to reduce the impact of their binary API going down

    • Dropped the dot: py.test -> pytest


Released May 9, 2018

  • Bugfixes

    • When getting a transaction with data attached and trying to modify it (say, to increase the gas price), the data was not being reattached in the new transaction.

    • web3.personal.sendTransaction() was crashing when using a transaction generated with buildTransaction()

  • Misc

    • Improved error message when connecting to a geth-style PoA network

    • Improved error message when address is not checksummed

    • Started in on support for fixedMxN ABI arguments

    • Lots of documentation upgrades, including:

      • Guide for understanding nodes/networks/connections

      • Simplified Quickstart with notes for common issues

      • A new Troubleshooting section

    • Potential pypy performance improvements (use toolz instead of cytoolz)

    • eth-tester upgraded to beta 24


Released Apr 25, 2018

  • Removed audit warning and opt-in requirement for w3.eth.account. See more in: Working with Local Private Keys

  • Added an API to look up contract functions: fn = contract.functions['function_name_here']

  • Upgrade Whisper (shh) module to use v6 API

  • Bugfix: set ‘to’ field of transaction to empty when using transaction = contract.constructor().buildTransaction()

  • You can now specify nonce in buildTransaction()

  • Distinguish between chain id and network id – currently always return None for chainId

  • Better error message when trying to use a contract function that has 0 or >1 matches

  • Better error message when trying to install on a python version <3.5

  • Installs pypiwin32 during pip install, for a better Windows experience

  • Cleaned up a lot of test warnings by upgrading from deprecated APIs, especially from the deprecated contract.deploy(txn_dict, args=contract_args) to the new contract.constructor(*contract_args).transact(txn_dict)

  • Documentation typo fixes

  • Better template for Pull Requests


Released Apr 9, 2018

  • New WebsocketProvider. If you’re looking for better performance than HTTP, check out websockets.

  • New w3.eth.waitForTransactionReceipt()

  • Added name collision detection to ConciseContract and ImplicitContract

  • Bugfix to allow fromBlock set to 0 in createFilter, like, ...)

  • Bugfix of ENS automatic connection

  • eth-tester support for Byzantium

  • New migration guide for v3 -> v4 upgrade

  • Various documentation updates

  • Pinned eth-account to older version


Released Apr 2, 2018

  • Marked beta.13 as stable

  • Documentation tweaks


Released Mar 27, 2018

This is intended to be the final release before the stable v4 release.

  • Add support for geth 1.8 (fixed error on getTransactionReceipt())

  • You can now call a contract method at a specific block with the block_identifier keyword argument, see: call()

  • In preparation for stable release, disable w3.eth.account by default, until a third-party audit is complete & resolved.

  • New API for contract deployment, which enables gas estimation, local signing, etc. See constructor().

  • Find contract events with$my_event.createFilter()

  • Support auto-complete for contract methods.

  • Upgrade most dependencies to stable

    • eth-abi

    • eth-utils

    • hexbytes

    • not included: eth-tester and eth-account

  • Switch the default EthereumTesterProvider backend from eth-testrpc to eth-tester: web3.providers.eth_tester.EthereumTesterProvider

  • A lot of documentation improvements

  • Test node integrations over a variety of providers

  • geth 1.8 test suite


A little hiccup on release. Skipped.


Released Feb 28, 2018

  • New methods to modify or replace pending transactions

  • A compatibility option for connecting to geth --dev – see Geth-style Proof of Authority

  • A new

  • Create a filter object from an existing filter ID.

  • eth-utils v1.0.1 (stable) compatibility


Released Feb 21, 2018

  • bugfix: Compatibility with eth-utils v1-beta2 (the incompatibility was causing fresh installs to fail)

  • bugfix: crash when sending the output of contract.functions.myFunction().buildTransaction() to sendTransaction(). Now, having a chainID key does not crash sendTransaction.

  • bugfix: a TypeError when estimating gas like: contract.functions.myFunction().estimateGas() is fixed

  • Added parity integration tests to the continuous integration suite!

  • Some py3 and docs cleanup


Released Feb 8, 2018

  • Access event log parameters as attributes

  • Support for specifying nonce in eth-tester

  • Bugfix dependency conflicts between eth-utils, eth-abi, and eth-tester

  • Clearer error message when invalid keywords provided to contract constructor function

  • New docs for working with private keys + set up doctests

  • First parity integration tests

  • replace internal implementation of w3.eth.account with eth_account.account.Account


Released Feb 7, 2018, then recalled. It added 32MB of test data to git history, so the tag was deleted, as well as the corresponding release. (Although the release would not have contained that test data)


Released Jan 29, 2018

  • Support for web3.eth.Eth.getLogs() in eth-tester with py-evm

  • Process transaction receipts with Event ABI, using*args, **kwargs).processReceipt(transaction_receipt) see Event Log Object for the new type.

  • Add timeout parameter to web3.providers.ipc.IPCProvider

  • bugfix: make sure idna package is always installed

  • Replace ethtestrpc with py-evm, in all tests

  • Dockerfile fixup

  • Test refactoring & cleanup

  • Reduced warnings during tests


Released Jan 18, 2018

  • New contract function call API: my_contract.functions.my_func().call() is preferred over the now deprecated API.

  • A new, sophisticated gas estimation algorithm, based on the approach. You must opt-in to the new approach, because it’s quite slow. We recommend using the new caching middleware. See web3.gas_strategies.time_based.construct_time_based_gas_price_strategy()

  • New caching middleware that can cache based on time, block, or indefinitely.

  • Automatically retry JSON-RPC requests over HTTP, a few times.

  • ConciseContract now has the address directly

  • Many eth-tester fixes. web3.providers.eth_tester.main.EthereumTesterProvider is now a legitimate alternative to web3.providers.tester.EthereumTesterProvider.

  • ethtest-rpc removed from testing. Tests use eth-tester only, on pyethereum. Soon it will be eth-tester with py-evm.

  • Bumped several dependencies, like eth-tester

  • Documentation updates


Released Dec 28, 2017

  • Improvements to working with eth-tester, using EthereumTesterProvider:

  • IPCProvider now automatically retries on a broken connection, like when you restart your node

  • New gas price engine API, laying groundwork for more advanced gas pricing strategies


Released Dec 7, 2017

  • New buildTransaction() method to prepare contract transactions, offline

  • New automatic provider detection, for w3 = Web3() initialization

  • Set environment variable WEB3_PROVIDER_URI to suggest a provider for automatic detection

  • New API to set providers like: w3.providers = [IPCProvider()]

  • Crashfix: web3.eth.Eth.filter() when retrieving logs with the argument ‘latest’

  • Bump eth-tester to v0.1.0-beta.5, with bugfix for filtering by topic

  • Removed GPL lib pylru, now believed to be in full MIT license compliance.


Released Dec 1, 2017

  • Fix encoding of ABI types: bytes[] and string[]

  • Windows connection error bugfix

  • Bugfix message signatures that were broken ~1% of the time (zero-pad r and s)

  • Autoinit web3 now produces None instead of raising an exception on from import w3

  • Clearer errors on formatting failure (includes field name that failed)

  • Python modernization, removing Py2 compatibility cruft

  • Update dependencies with changed names, now:

    • eth-abi

    • eth-keyfile

    • eth-keys

    • eth-tester

    • eth-utils

  • Faster Travis CI builds, with cached geth binary


Released Nov 22, 2017

Bug Fixes:

  • sendRawTransaction() accepts raw bytes

  • contract() accepts an ENS name as contract address

  • signTransaction() returns the expected hash (after signing the transaction)

  • Account methods can all be called statically, like: Account.sign(...)

  • getTransactionReceipt() returns the status field as an int

  • Web3.soliditySha3() looks up ENS names if they are supplied with an “address” ABI

  • If running multiple threads with the same w3 instance, ValueError: Recursively called ... is no longer raised

Plus, various python modernization code cleanups, and testing against geth 1.7.2.


  • Python 3 is now required

  • ENS names can be used anywhere that a hex address can

  • Sign transactions and messages with local private keys

  • New filter mechanism: get_all_entries() and get_new_entries()

  • Quick automatic initialization with from import w3

  • All addresses must be supplied with an EIP-55 checksum

  • All addresses are returned with a checksum

  • Renamed Web3.toDecimal() to toInt(), see: Encoding and Decoding Helpers

  • All filter calls are synchronous, gevent integration dropped

  • Contract eventFilter() has replaced both Contract.on() and Contract.pastEvents()

  • Contract arguments of bytes ABI type now accept hex strings.

  • Contract arguments of string ABI type now accept python str.

  • Contract return values of string ABI type now return python str.

  • Many methods now return a bytes-like object where they used to return a hex string, like in Web3.sha3()

  • IPC connection left open and reused, rather than opened and closed on each call

  • A number of deprecated methods from v3 were removed


  • Addition of ethereum-tester as a dependency


  • Addition of named middlewares for easier manipulation of middleware stack.

  • Provider middlewares can no longer be modified during runtime.

  • Experimental custom ABI normalization API for Contract objects.


  • Change docs to use RTD theme

  • Experimental new EthereumTesterProvider for the ethereum-tester library.

  • Bugfix for function type abi encoding via ethereum-abi-utils upgrade to v0.4.1

  • Bugfix for Web3.toHex to conform to RPC spec.


  • Fix PyPi readme text.


  • Fix PyPi readme text.


  • New stalecheck_middleware

  • Improvements to Web3.toHex and Web3.toText.

  • Improvements to Web3.sha3 signature.

  • Bugfixes for Web3.eth.sign api


  • Add experimental fixture_middleware

  • Various bugfixes introduced in middleware API introduction and migration to formatter middleware.


  • Bugfix for formatter handling of contract creation transaction.


  • Improved testing infrastructure.


  • Bugfix for retrieving filter changes for both new block filters and pending transaction filters.


  • Fix mispelled attrdict_middleware (was spelled attrdict_middlware).


  • New Middleware API

  • Support for multiple providers

  • New web3.soliditySha3

  • Remove multiple functions that were never implemented from the original web3.

  • Deprecated web3.currentProvider accessor. Use web3.provider now instead.

  • Deprecated password prompt within web3.personal.newAccount.


  • Bugfix for abi filtering to correctly handle constructor and fallback type abi entries.


  • All web3 apis which accept address parameters now enforce checksums if the address looks like it is checksummed.

  • Improvements to error messaging with when calling a contract on a node that may not be fully synced

  • Bugfix for web3.eth.syncing to correctly handle False


  • Web3 now returns web3.utils.datastructures.AttributeDict in places where it previously returned a normal dict.

  • web3.eth.contract now performs validation on the address parameter.

  • Added web3.eth.getWork API


  • Add validation for the abi parameter of eth

  • Contract return values of bytes, bytesXX and string are no longer converted to text types and will be returned in their raw byte-string format.


  • Bugfix for eth_sign double hashing input.

  • Removed deprecated DelegatedSigningManager

  • Removed deprecate PrivateKeySigningManager


  • Update pyrlp dependency to >=0.4.7

  • Update eth-testrpc dependency to >=1.2.0

  • Deprecate DelegatedSigningManager

  • Deprecate PrivateKeySigningManager


  • upstream version bump for bugfix in eth-abi-utils


  • deprecate eth.defaultAccount defaulting to the coinbase account.


  • Fix error message from contract factory creation.

  • Use ethereum-utils for utility functions.


  • Upgrade ethereum-abi-utils dependency for upstream bugfix.


  • Deprecate Contract.code: replaced by Contract.bytecode

  • Deprecate Contract.code_runtime: replaced by Contract.bytecode_runtime

  • Deprecate abi, code, code_runtime and source as arguments for the Contract object.

  • Deprecate source as a property of the Contract object

  • Add Contract.factory() API.

  • Deprecate the construct_contract_factory helper function.


  • Bugfix for how requests library is used. Now reuses session.


  • Bugfix for construction of request_kwargs within HTTPProvider


  • Allow HTTPProvider to be imported from web3 module.

  • make HTTPProvider accessible as a property of web3 instances.


  • Deprecate web3.providers.rpc.RPCProvider

  • Deprecate web3.providers.rpc.KeepAliveRPCProvider

  • Add new web3.providers.rpc.HTTPProvider

  • Remove hard dependency on gevent.


  • Bugfix for web3.eth.getTransaction when the hash is unknown.


  • Bugfix for event log data decoding to properly handle dynamic sized values.

  • New web3.tester module to access extra RPC functionality from eth-testrpc


  • Fix package so that eth-testrpc is not required.



  • Bugfix for contract instances to respect web3.eth.defaultAccount

  • Better error reporting when ABI decoding fails for contract method response.


  • New EthereumTesterProvider now available. Faster test runs than TestRPCProvider

  • Updated underlying eth-testrpc requirement.


  • web3.shh is now implemented.

  • Introduced KeepAliveRPCProvider to correctly recycle HTTP connections and use HTTP keep alive


  • Bugfix for contract transaction sending not respecting the web3.eth.defaultAccount configuration.


  • New DelegatedSigningManager and PrivateKeySigningManager classes.


  • Bugfix or IPCProvider not handling large JSON responses well.


  • Better RPC compliance to be compatable with the Parity JSON-RPC server.


  • Filter objects now support controlling the interval through which they poll using the poll_interval property


  • Bugfix generation of event topics.

  • Web3.Iban now allows access to Iban address tools.


  • Bugfix for geth.ipc path on linux systems.


  • Changes to the Contract API:
    • Contract.deploy() parameter arguments renamed to args

    • Contract.deploy() now takes args and kwargs parameters to allow constructing with keyword arguments or positional arguments.

    • Contract.pastEvents now allows you to specify a fromBlock or ``toBlock. Previously these were forced to be 'earliest' and web3.eth.blockNumber respectively.

    •, Contract.transact and Contract.estimateGas are now callable as class methods as well as instance methods. When called this way, an address must be provided with the transaction parameter.

    •, Contract.transact and Contract.estimateGas now allow specifying an alternate address for the transaction.

  • RPCProvider now supports the following constructor arguments.
    • ssl for enabling SSL

    • connection_timeout and network_timeout for controlling the timeouts for requests.


  • Bugfix: Fix KeyError in merge_args_and_kwargs helper fn.


  • Bugfix for usage of block identifiers ‘latest’, ‘earliest’, ‘pending’

  • Sphinx documentation

  • Non-data transactions now default to 90000 gas.

  • Web3 object now has helpers set as static methods rather than being set at initialization.

  • RPCProvider now takes a path parameter to allow configuration for requests to go to paths other than /.


  • TestRPCProvider no longer dumps logging output to stdout and stderr.

  • Bugfix for return types of address[]

  • Bugfix for event data types of address


  • All transactions which contain a data element will now have their gas automatically estimated with 100k additional buffer. This was previously only true with transactions initiated from a Contract object.


  • Contract functions can now be called using keyword arguments.


  • Upstream fixes for filters

  • Filter APIs on and pastEvents now callable as both instance and class methods.


  • The filters that come back from the contract on and pastEvents methods now call their callbacks with the same data format as web3.js.


  • Cast RPCProvider port to an integer.


  • Remove all monkeypatching


  • Pull in downstream updates to proper gevent usage.

  • Fix eth_sign

  • Bugfix with contract operations mutating the transaction object that is passed in.

  • More explicit linting ignore statements.


  • BugFix: fix for python3 only json.JSONDecodeError handling.


  • BugFix: RPCProvider not sending a content-type header

  • Bugfix: web3.toWei now returns an integer instead of a decimal.Decimal


  • TestRPCProvider can now be imported directly from web3


  • Add eth.admin interface.

  • Bugfix: Format the return value of web3.eth.syncing

  • Bugfix: IPCProvider socket interactions are now more robust.


  • Downstream package upgrades for eth-testrpc and ethereum-tester-client to handle configuration of the Homestead and DAO fork block numbers.


  • Rename web3.contract._Contract to web3.contract.Contract to expose it for static analysis and auto completion tools

  • Allow passing string parameters to functions

  • Automatically compute gas requirements for contract deployment and

  • transactions.

  • Contract Filters

  • Block, Transaction, and Log filters

  • web3.eth.txpool interface

  • web3.eth.mining interface

  • Fixes for encoding.


  • Bugfix to allow address types in constructor arguments.


  • Partial implementation of the web3.eth.contract interface.


  • Restructure project modules to be more flat

  • Add ability to run test suite without the slow tests.

  • Breakup encoding utils into smaller modules.

  • Basic pep8 formatting.

  • Apply python naming conventions to internal APIs

  • Lots of minor bugfixes.

  • Removal of dead code left behing from 1.0.0 refactor.

  • Removal of web3/solidity module.


  • Add missing isConnected() method.

  • Add test coverage for setProvider()


  • Specify missing pyrlp and gevent dependencies


  • Massive refactor to the majority of the app.


  • Initial release