Ethereum contract check

$0.003 per call · failed calls are never charged · no account or API key needed

Check whether a 0x address on Ethereum is a smart contract or a plain wallet: bytecode size, and whether it is an EIP-1167 minimal proxy and which implementation it points to. Use before sending funds or approving a spender; for a fuller risk verdict use check_counterparty. A malformed address is rejected with 400, uncharged.

Run it free (25 free calls) Buy credits by card (from $5) Example result (JSON)

Inputs

Name	Type	Description
`address` (required)	string	0x address

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/eth/is-contract?address=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/eth/is-contract?address=0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum, Monad, World Chain or Tempo) and retries.

Example result

{
  "chain": "Ethereum",
  "chainId": 1,
  "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
  "isContract": true,
  "codeBytes": 1855,
  "minimalProxy": false,
  "implementation": null
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is eth_is_contract, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

Ethereum contract check

Inputs

Request

Example result

From an AI agent (MCP)

Related tools