Universal blockchain ABI decoder — production-grade EVM event & call decoding

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Project description

chaincodec (Python)

Universal blockchain ABI decoder — production-grade EVM event log and function call decoding, with 50+ built-in DeFi/NFT/bridge protocol schemas.

Install

pip install chaincodec

Prebuilt wheels for Linux (x64, arm64, musl), macOS (x64, arm64), and Windows (x64). No Rust toolchain required.

Quick Start

import asyncio
from chaincodec import EvmDecoder, MemoryRegistry

async def main():
    # Load a schema
    registry = MemoryRegistry()
    registry.load_file("schemas/erc20.csdl")

    decoder = EvmDecoder()

    # Decode an ERC-20 Transfer event
    raw_log = {
        "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
        "topics": [
            "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
            "0x000000000000000000000000d8da6bf26964af9d7eed9e03e53415d37aa96045",
            "0x000000000000000000000000ab5801a7d398351b8be11c439e05c5b3259aec9b",
        ],
        "data": "0x000000000000000000000000000000000000000000000000000000003b9aca00",
    }

    fingerprint = "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
    schema = registry.get_by_fingerprint(fingerprint)

    event = decoder.decode_event(raw_log, schema)
    print(event)
    # DecodedEvent(schema="ERC20Transfer", fields={"from": "0xd8dA...", "to": "0xAb58...", "value": 1000000000})

asyncio.run(main())

Decode Function Calls

from chaincodec import EvmCallDecoder, MemoryRegistry

registry = MemoryRegistry()
registry.load_file("schemas/uniswap-v3.csdl")

decoder = EvmCallDecoder()
call_data = bytes.fromhex("414bf389...")  # exactInputSingle calldata

result = decoder.decode_call(call_data, registry)
print(result.function_name)  # "exactInputSingle"
print(result.inputs)         # [("tokenIn", "0x..."), ("amountIn", 1000000)]

Encode Function Calls

from chaincodec import EvmEncoder, MemoryRegistry

registry = MemoryRegistry()
registry.load_file("schemas/erc20.csdl")

encoder = EvmEncoder()
calldata = encoder.encode_call("transfer", ["0xRecipient...", 1_000_000], registry)
# b'\xa9\x05\x9c\xbb...'

Batch Decode

from chaincodec import EvmDecoder, MemoryRegistry

registry = MemoryRegistry()
registry.load_directory("schemas/")   # loads all 50+ schemas

decoder = EvmDecoder()
events = decoder.decode_batch(raw_logs, registry)
# Parallel decode via Rayon — >1M events/sec

Built-in Schemas (53 protocols)

Category	Protocols
Tokens	ERC-20, ERC-721, ERC-1155, WETH, ERC-4626, ENS, ERC-4337
DEX	Uniswap V2/V3, SushiSwap, Curve, Balancer V2, Camelot, DODO, Bancor V3
Lending	Aave V2/V3, Compound V2/V3, Morpho Blue, Spark
Derivatives	GMX, GMX V1, dYdX V4, Perpetual Protocol, Synthetix V3, Ribbon Finance
LSD/Staking	Lido, Rocket Pool, Frax Ether, Stader, EigenLayer, Convex, Yearn
Bridges	Wormhole, LayerZero V2, Hop, Celer, Stargate, Across
NFT	OpenSea, Blur, CryptoPunks, BAYC, LooksRare
Governance	Safe Multisig, Compound Governance
Oracle	Chainlink (Aggregator, VRF, CCIP)
Other	Pendle Finance, Maker DAO

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This version

0.2.0

Mar 8, 2026

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chainfoundry-chaincodec 0.2.0

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chaincodec (Python)

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