feat: add EVM payment method (e.g. Base) - #243
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Adds mpp.methods.evm, ported from the ../mpp/evm.py prototype: a Method/Intent pair for standard EVM chains that settles charges with a plain ERC-20 transfer instead of Tempo's native account-abstraction transaction. Client-side builds and signs an EIP-1559 transaction; server-side broadcasts it and confirms the mined receipt contains a matching Transfer log, with optional Store-backed replay protection. Ships behind a new "evm" extra (eth-account, eth-hash) and follows the tempo method's package layout and lazy-export conventions. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_012oZVh6chEXJMiVkQ2Qsjej
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Summary
mpp.methods.evm, ported from the../mpp/evm.pyprototype: aMethod/Intentpair for standard EVM chains (Base by default) that settles charges with a plain ERC-20transferinstead of Tempo's native account-abstraction transaction.transfer(address,uint256); server side broadcasts it and confirms the mined receipt contains a matchingTransferlog, with optionalStore-backed replay protection.evmextra (eth-account,eth-hash[pycryptodome]) and followsmpp.methods.tempo's package layout and lazy-export conventions (account.py,client.py,intents.py,_defaults.py,_rpc.py, lazy__init__.py/__init__.pyi).Test plan
tests/test_evm.py(51 tests): account key handling,evm()factory defaults/overrides, client-side transaction building (incl. chain-id mismatch, gas-estimate fallback), server-sideChargeIntentverification (decode failures, revert/missing-log handling, receipt polling, replay protection, "already known" tx tolerance), and an end-to-end client→server flow.tests/test_optional_deps.py/tests/test_import_isolation.pyextended with evm-extra coverage mirroring the existing tempo-extra tests.ruff check ./ruff format --check .cleanpyrightclean (0 errors)🤖 Generated with Claude Code