ToolVet
78trust / 100

Evm Call

by SiteCheck in Onchain & crypto

x402 APIPassing, checked 4 h ago

Read-only contract call (eth_call): decodes the return value of a function you name, e.g. balanceOf(address) returns (uint256). Nothing is signed or sent. A function whose name reads like a write (transfer, approve, mint, set...) is refused unless it is declared view or pure.

GET
https://api.sitecheck-api.workers.dev/api/evm/call
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
62 ms
912 ms slowest 5%
Last check
Passed
4 h 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/call

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/call?args=%5B%220xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045%22%5D&chain=base&contract=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&function=balanceOf%28address%29+returns+%28uint256%29

Parameters

ParameterTypeRequiredDescription
argsstringNoJSON array of arguments, e.g. ["0xd8dA…"]
chainstringNobase (default), ethereum, arbitrum, optimism or polygon
contractstringYesContract address, 0x…
functionstringYesHuman-readable signature, e.g. balanceOf(address) returns (uint256)

Example response

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

{
  "args": [
    "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  ],
  "chain": "base",
  "checkedAt": "2026-10-14T04:49:19.343Z",
  "contract": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
  "disclaimer": "Information only, not financial advice.",
  "function": "function balanceOf(address) returns (uint256)",
  "outputs": [
    {
      "name": null,
      "type": "uint256"
    }
  ],
  "result": "44783666",
  "source": "https://base-rpc.publicnode.com (eth_call, read-only)"
}

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/call?args=%5B%220xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045%22%5D&chain=base&contract=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&function=balanceOf%28address%29+returns+%28uint256%29'

# 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/call?args=%5B%220xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045%22%5D&chain=base&contract=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&function=balanceOf%28address%29+returns+%28uint256%29' \
  | 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%2Fcall
const res = await pay("https://api.sitecheck-api.workers.dev/api/evm/call?args=%5B%220xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045%22%5D&chain=base&contract=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&function=balanceOf%28address%29+returns+%28uint256%29");
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/call?args=%5B%220xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045%22%5D&chain=base&contract=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913&function=balanceOf%28address%29+returns+%28uint256%29")
    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
4 h agoPassed40274 ms$0.002
8 h agoPassed402912 ms$0.002
12 h agoPassed40262 ms$0.002
17 h agoPassed40262 ms$0.002
21 h agoPassed402148 ms$0.002
Show 2 older checks
25 h agoPassed40256 ms$0.002
29 h agoPassed40254 ms$0.002