Verified contract ABI (Sourcify) · Contract ABI

POSTBaseSolanaArbitrumPolygonMonadAvalancheeip155:1329OptimismFraxtaleip155:42220stellar:pubnetalgorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=

$0.003

per call · USD Coin on Base

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.

Endpoint

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

Calls / 30d

Unique payers / 30d

Aug 31

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch

import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://agent402.tools/api/contract-abi", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "network": "base"
  }),
});
const data = await res.json();

cURL

curl -X POST \
  "https://agent402.tools/api/contract-abi" \
  -H "Content-Type: application/json" \
  -d '{"address":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","network":"base"}' \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "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
}

Payment details

Pay to0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0

AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913

NetworksBase, Solana, Arbitrum, Polygon, Monad, Avalanche, eip155:1329, Optimism, Fraxtal, eip155:42220, stellar:pubnet, algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=

Schemesexact, upto

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