Vextorium EVM Contract ABI Lookup

x402

Vextorium EVM Contract ABI Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-16).

Returns the full verified ABI of any EVM smart contract from Sourcify, including function signatures, selectors, input/output types, read/write flags, events with topic0, and proxy implementation addresses.

Price / call$0.004

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StatusUnknown

How this service works

ABI of a verified EVM contract (Sourcify): every function with signature, selector, inputs, outputs and read/write flag, plus events with topic0 and proxy implementations. Ready-to-use signatures for leer-contrato.

Output

A JSON object containing the contract name, source (Sourcify), chain ID, contract address, a boolean indicating whether it is a proxy, an array of functions (each with signature, selector, inputs, outputs, mutability, read flag, and a ready-to-use cast-compatible signature), an array of events (each with signature, topic0, and indexed parameter names), and an array of proxy implementation addresses.

Example use cases

Inspect DeFi protocol contract interface

“Get me all the read and write functions for the Aave v3 pool contract at 0x87870Bca3F3fD6335C3F4ce8392D69350B4fA4E2 on Ethereum, including their selectors and input types.”

Find contract events for on-chain monitoring

“I need all the event signatures and topic0 hashes for the Uniswap v3 factory contract at 0x1F98431c8aD98523631AE4a59f267346ea31F984 on Ethereum so I can set up log filters.”

Detect proxy and implementation addresses

“Is the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum a proxy? If so, what are its implementation addresses and what functions does the implementation expose?”

Technical details

Endpoint

POSThttps://api.vextorium.com/contrato-abi-pago?utm_source=zero.xyz

When to prefer

Choose this endpoint when you need verified ABI data from Sourcify for any EVM-compatible chain (Ethereum, Base, Arbitrum, Optimism, Polygon, BSC, etc.), especially when you want structured function signatures, selectors, and event topic0 hashes ready for use in smart contract interactions or on-chain monitoring. Prefer this over generic ABI fetching when you need proxy detection and implementation resolution, or when you need the para_leer_contrato format for cast/ethers read calls.

Side effects

Contract address not found or not verified on Sourcify — returns null fields or empty arrays
Invalid or unsupported network name — request fails or returns error
Malformed contract address — validation error on input
Contract exists on-chain but source is unverified — ABI unavailable
Network connectivity issues to Sourcify backend — timeout or error response

Input

Schema · Request body

Field	Type	Description
red	string	ethereum, base, arbitrum, optimism, polygon, bsc... or chainId
tipo	string
direccion	string

Output

Schema · Response

{
  "type": "json",
  "example": {
    "nota": null,
    "fuente": "Sourcify",
    "nombre": "Dai",
    "eventos": [
      {
        "firma": "Approval(address,address,uint256)",
        "topic0": "0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925",
        "indexados": [
          "src",
          "guy"
        ]
      },
      {
        "firma": "LogNote(bytes4,address,bytes32,bytes32,bytes)",
        "topic0": "0xd3d8bec38a91a5f4411247483bc030a174e77cda9c0351924c759f41453aa5e8",
        "indexados": [
          "sig",
          "usr"
        ]
      }
    ],
    "chain_id": 1,
    "contrato": "0x6B175474E89094C44Da98b954EedeAC495271d0F",
    "es_proxy": false,
    "funciones": [
      {
        "firma": "DOMAIN_SEPARATOR()",
        "lectura": true,
        "salidas": "bytes32",
        "entradas": [],
        "selector": "0x3644e515",
        "mutabilidad": "view",
        "para_leer_contrato": "DOMAIN_SEPARATOR()(bytes32)"
      },
      {
        "firma": "PERMIT_TYPEHASH()",
        "lectura": true,
        "salidas": "bytes32",
        "entradas": [],
        "selector": "0x30adf81f",
        "mutabilidad": "view",
        "para_leer_contrato": "PERMIT_TYPEHASH()(bytes32)"
      }
    ],
    "implementaciones": []
  }
}

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