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Contract Abi

by Verified contract ABI (Sourcify) in Onchain & crypto

x402 APIPassing, checked 37 min ago

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.

POST https://agent402.tools/api/contract-abi

Last 30 days

All checks passedSome failedAll failedNot checked
Uptime
100%
Response time
190 ms typical, 190 ms slowest 5%
Last check
37 min ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/contract-abi" \
  -H "content-type: application/json" \
  -d '{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Fcontract-abi
const res = await pay("https://agent402.tools/api/contract-abi", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base"}),
});
console.log(await res.json());

Example input

{
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "network": "base"
}

Example output

{
  "abi": [
    {
      "inputs": [],
      "name": "implementation",
      "outputs": [
        {
          "type": "address"
        }
      ],
      "type": "function"
    }
  ],
  "address": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
  "chainId": 8453,
  "events": [
    {
      "signature": "Upgraded(address)"
    }
  ],
  "functions": [
    {
      "selector": "0x5c60da1b",
      "signature": "implementation()"
    }
  ],
  "match": "exact_match",
  "network": "base",
  "verified": true
}

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
37 min agoPassed402192 ms$0.003
6 h agoPassed402190 ms$0.003