ToolVet
81trust / 100

Counterpartycheck Lite

by CounterpartyCheck by AgentGate in Onchain & crypto

x402 APIPassing, checked 7 h ago

Crypto address risk check API (pre-payment counterparty screening). Pre-payment counterparty check for agents: before paying or approving an EVM (Base, Ethereum, Polygon, Arbitrum) or Solana address, get ok / caution / block with reasons. Screens OFAC SDN and ScamSniffer scam lists, x402 Bazaar payee directory and known labels, and reads the address on-chain (wallet, contract, token contract, Safe, EIP-7702 delegation, activity, USDC balance).

GET
https://api.youraitools.co/counterpartycheck/v1/lite
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
97 ms
151 ms slowest 5%
Last check
Passed
7 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 · Watch with other listings

How to call it

GET https://api.youraitools.co/counterpartycheck/v1/lite

Each call costs $0.005 in USDC on Polygon, 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.youraitools.co/counterpartycheck/v1/lite?address=0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F&chain=base&intent=pay

Parameters

ParameterTypeRequiredDescription
addressstringYesCounterparty address: EVM 0x + 40 hex, or a Solana base58 address
chainstringNoChain of the payment (default base; a base58 address implies solana) One of: base, ethereum, polygon, arbitrum, solana.
intentstringNoWhat you are about to do (default pay): changes which signals matter, e.g. paying a token contract or approving an EOA One of: pay, approve, interact.

Example response

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

Example response, 27 lines
{
  "address": "0x098b716b8aaf21512996dc57eb0615e2383e2f96",
  "chain": "ethereum",
  "confidence": "high",
  "facts": {
    "kind": "eoa",
    "native_balance": 101.8,
    "nonce": 38,
    "usdc_balance": 0
  },
  "intent": "pay",
  "reasons": [
    {
      "code": "ofac_sdn",
      "severity": "danger",
      "text": "Listed on the US Treasury OFAC SDN list (LAZARUS GROUP, DPRK3). Do not pay or interact."
    },
    {
      "code": "active",
      "severity": "good",
      "text": "Active wallet: 38 outgoing transaction(s) on Ethereum."
    }
  ],
  "summary": "BLOCK: Listed on the US Treasury OFAC SDN list (LAZARUS GROUP, DPRK3). Do not pay or interact.",
  "tier": "lite",
  "verdict": "block"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.youraitools.co/counterpartycheck/v1/lite?address=0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F&chain=base&intent=pay'

# 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.youraitools.co/counterpartycheck/v1/lite?address=0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F&chain=base&intent=pay' \
  | 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.youraitools.co%2Fcounterpartycheck%2Fv1%2Flite
const res = await pay("https://api.youraitools.co/counterpartycheck/v1/lite?address=0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F&chain=base&intent=pay");
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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
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.youraitools.co/counterpartycheck/v1/lite?address=0x3c1A1E01e790Cd326495631B3b38Bd7068F08d6F&chain=base&intent=pay")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

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