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Contract ABI Lookup via Sourcify (agent402.tools)
x402
Contract ABI Lookup via Sourcify (agent402.tools) is a paid API for AI agents from agent402.tools, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Fetches the verified ABI and human-readable function signatures with 4-byte selectors for an EVM smart contract address from Sourcify, across 8 mainnets.
Price / call$0.003
Success—
StatusUnknown
How this service works
Fetch the verified ABI for a contract address from Sourcify, plus a ready-to-use list of human-readable function signatures with their 4-byte selectors. Covers 8 EVM mainnets. Unverified contracts return a structured {verified:false} miss. Pair with /api/calldata-decode to decode transactions against this ABI.
Output
Returns the verified ABI array for the contract, plus a list of human-readable function signatures paired with their 4-byte selectors. If the contract is unverified on Sourcify, returns a structured {verified: false} object indicating a miss.
Example use cases
Example prompt
“Can you fetch the verified ABI and function signatures for the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum — I need to know what functions it exposes and their 4-byte selectors.”
Technical details
Endpoint
POSThttps://agent402.tools/api/contract-abiWhen to prefer
Use this endpoint when you need to programmatically discover the interface of an EVM smart contract — its ABI, callable functions, and 4-byte selectors — without manually searching Etherscan or other block explorers. Ideal when building agents that need to interact with unknown contracts, decode transaction calldata, or validate a contract's interface before calling it. Covers 8 EVM mainnets including Ethereum, Base, Polygon, Arbitrum, Optimism, BSC, Gnosis, and Celo.
Side effects
- Contract not verified on Sourcify — returns {verified: false} structured miss
- Invalid or malformed contract address — likely 400 or structured error
- Unsupported network name — falls back to base or errors
- Contract exists but has no source code submitted to Sourcify
- Network temporarily unavailable — upstream Sourcify timeout
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | 0x-prefixed 40-char contract address. |
| network | string | ethereum / base / polygon / arbitrum / optimism / bsc / gnosis / celo (default base). |
Output
Schema · Response
{
"type": "json",
"example": {
"abi": [
{
"name": "implementation",
"type": "function",
"inputs": [],
"outputs": [
{
"type": "address"
}
]
}
],
"match": "exact_match",
"events": [
{
"signature": "Upgraded(address)"
}
],
"address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
"chainId": 8453,
"network": "base",
"verified": true,
"functions": [
{
"selector": "0x5c60da1b",
"signature": "implementation()"
}
]
}
}Tags
x402
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