ToolVet
80trust / 100

Evm Contract

by SiteCheck in Onchain & crypto

x402 APIPassing, checked 35 min ago

Whether a contract's source is verified on Sourcify (exact or partial match), with its name, compiler version, license, and the functions and events from its ABI. A contract without verified source is answered with verified false, not an error. Chains: base (default), ethereum, arbitrum, optimism, polygon. Read-only.

GET
https://api.sitecheck-api.workers.dev/api/evm/contract
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
58 ms
97 ms slowest 5%
Last check
Passed
35 min ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

GET https://api.sitecheck-api.workers.dev/api/evm/contract

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://api.sitecheck-api.workers.dev/api/evm/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base

Parameters

ParameterTypeRequiredDescription
addressstringYesContract address, 0x…
chainstringNobase (default), ethereum, arbitrum, optimism or polygon

Example response

The provider's example. We can't check it without paying.

Example response, 39 lines
{
  "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "chain": "base",
  "chainId": 8453,
  "checkedAt": "2026-10-14T07:00:21.039Z",
  "compilerVersion": "0.6.12+commit.27d51765",
  "events": [
    {
      "name": "AdminChanged",
      "signature": "AdminChanged(address,address)"
    },
    {
      "name": "Upgraded",
      "signature": "Upgraded(address)"
    }
  ],
  "functions": [
    {
      "name": "admin",
      "signature": "admin()",
      "stateMutability": "view"
    },
    {
      "name": "changeAdmin",
      "signature": "changeAdmin(address)",
      "stateMutability": "nonpayable"
    },
    {
      "name": "implementation",
      "signature": "implementation()",
      "stateMutability": "view"
    }
  ],
  "license": "MIT",
  "match": "exact_match",
  "name": "FiatTokenProxy",
  "source": "https://sourcify.dev/server/v2/contract/8453/0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "verified": true
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.sitecheck-api.workers.dev/api/evm/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://api.sitecheck-api.workers.dev/api/evm/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.sitecheck-api.workers.dev%2Fapi%2Fevm%2Fcontract
const res = await pay("https://api.sitecheck-api.workers.dev/api/evm/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.sitecheck-api.workers.dev/api/evm/contract?address=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&chain=base")
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
35 min agoPassed40297 ms$0.002
5 h agoPassed40289 ms$0.002
9 h agoPassed40258 ms$0.002
14 h agoPassed40240 ms$0.002
18 h agoPassed40246 ms$0.002
Show 1 older checks
22 h agoPassed40268 ms$0.002