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Decode EVM smart-contract transaction calldata into the function name and typed parameters. Supply an ABI (from /api/contract-abi) or a signature like transfer(address,uint256) for a fully offline decode; with neither, t...
Fetch the verified ABI for a contract address from an open verified-contract repository, plus a ready-to-use list of human-readable function signatures with their 4-byte selectors. Covers 8 EVM mainnets. Unverified contr...
Contract ABI Lookup: Ethereum mainnet ABI for any contract address. Ethereum mainnet contract ABI. Takes query parameter address (contract, 0x + 40 hex). Returns the contract's ABI as JSON when one is available for that...
Decode calldata. Decode EVM transaction calldata into the function and its arguments with viem: give the function signature (transfer(address,uint256)), or leave it out to try common ERC-20, ERC-721, ERC-1155, WETH, perm...
Fetch a verified smart-contract's full source, ABI, compiler settings and NatSpec docs for an EVM address, and automatically resolve a proxy to its implementation so the response also carries the implementation ABI. One...
Encode a contract function call (calldata) from its signature and arguments, e.g. transfer(address,uint256) with [to, amount]: selector and hex data ready to sign or simulate.
EVM developer utilities: keccak256 hash, function selector from a signature, EIP-55 checksum address and wei/gwei/ether conversion.
Recover which address signed a message — Genesis402 / UnyKorn Operator Network
Turns a Solidity signature like transfer(address,uint256) into its 4-byte function selector and its 32-byte event topic0. What you need to build calldata by hand or to filter logs.
Decode EVM calldata (transaction input) with the function signature you provide, checking that it matches the selector, or decode return data with its output types (e.g. uint256,address). Local calculation, no third-part...
Contract ABI, verified contract. The verified ABI of a smart contract on Ethereum, Base, Arbitrum, Optimism or Polygon from Sourcify's open verification repository: contract name, compiler, match quality, every function...
Derive an Ethereum address from a public key — Genesis402 / UnyKorn Operator Network
EIP-191 digest of a message (what personal_sign actually signs) — Genesis402 / UnyKorn Operator Network
Event topic0 from a Solidity event signature — Genesis402 / UnyKorn Operator Network
Solidity abi.encodePacked equivalent — Genesis402 / UnyKorn Operator Network
Pad hex to a fixed byte width — Genesis402 / UnyKorn Operator Network
Decode a Base transaction's calldata into a human-readable function call and arguments — ERC-20 transfer/approve and the EIP-3009 transferWithAuthorization used by x402 settlements. Recognizes x402 settlement transaction...
Payment flow verification for agents integrating x402: confirms your wallet and payment channel work before you spend on a real endpoint. Category: infra.
ABI-decode return data against declared types — Genesis402 / UnyKorn Operator Network
ABI-encode a list of typed parameters — Genesis402 / UnyKorn Operator Network
Predict a contract address before it is deployed — Genesis402 / UnyKorn Operator Network
RLP-encode a value or nested list — Genesis402 / UnyKorn Operator Network
Split calldata into its selector and 32-byte words — Genesis402 / UnyKorn Operator Network
Compute the storage slot of a Solidity mapping entry — Genesis402 / UnyKorn Operator Network