ToolVet
77trust / 100

Run Base Receipt Verify

by AISkills402: Base Receipt in Onchain & crypto

x402 APIPassing, checked 4 h ago

Base Receipt Verify API: checks on Base mainnet that a transaction really paid USDC to an address - status, transfer, amount, payer and EIP-3009 nonce from the chain logs, never from the relayer. Base mainnet USDC only. $0.005 USDC per check, a live measurement. POST JSON {tx, pay_to, amount_micro?, from?, nonce?}; free example at https://api.aiskills402.com/v1/run/base-receipt-verify/example

POST
https://api.aiskills402.com/v1/run/base-receipt-verify
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
434 ms
930 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 · Watch with other listings

How to call it

POST https://api.aiskills402.com/v1/run/base-receipt-verify

Each call costs $0.005 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.

POST https://api.aiskills402.com/v1/run/base-receipt-verify
content-type: application/json

{
  "amount_micro": "3000",
  "from": null,
  "nonce": null,
  "pay_to": "0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4",
  "tx": "0xc741aa11e39c09bb0ec2975e7b6b738d7cea739d50b68524b2e05736c88bac8c"
}

Parameters

ParameterTypeRequiredDescription
amount_microstring or nullNoExpected amount in USDC micro-units (6 decimals); null = do not check.
fromstring or nullNoExpected payer (the transfer sender, not the relayer); null = do not check.
noncestring or nullNoExpected EIP-3009 authorization nonce; with from, also asked of the chain when the receipt is unknown.
pay_tostringYesThe address that should have received USDC.
txstringYesTransaction hash on Base mainnet.

Example response

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

Example response, 42 lines
{
  "engine": "1.0.0",
  "input_sha256": "<sha256 of the request>",
  "ok": true,
  "receipt": {
    "settled": true,
    "tx": "0x<settlement transaction>"
  },
  "refusal": null,
  "replay": false,
  "result": {
    "answered_by": "base.drpc.org",
    "authorization": {
      "authorizer": "0xa340966d806f114483d671f6bf934daebbdff8dc",
      "nonce": "0x61a1b7ac2ab9f8c22da20dc2802be3c298f8a7e5d598fc8c5d09d7b5de28f1ca"
    },
    "block": 52689216,
    "checked_at": "2026-10-16T17:26:09.575Z",
    "checks": {
      "amount_matches": true,
      "asset_is_usdc_base": true,
      "from_matches": null,
      "nonce_matches": null,
      "status_success": true,
      "to_matches": true
    },
    "confirmations": 1895,
    "findings": [],
    "found": true,
    "latest_block": 52691111,
    "nodes_asked": 1,
    "nonce_state": null,
    "status": "success",
    "transfer": {
      "from": "0xa340966d806f114483d671f6bf934daebbdff8dc",
      "to": "0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4",
      "value_micro": "3000"
    },
    "verdict": "confirmed"
  },
  "skill": "base-receipt-verify"
}

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 -X POST 'https://api.aiskills402.com/v1/run/base-receipt-verify' \
  -H 'content-type: application/json' \
  --data-raw '{"amount_micro":"3000","from":null,"nonce":null,"pay_to":"0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4","tx":"0xc741aa11e39c09bb0ec2975e7b6b738d7cea739d50b68524b2e05736c88bac8c"}'

# 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 - -X POST 'https://api.aiskills402.com/v1/run/base-receipt-verify' \
  -H 'content-type: application/json' \
  --data-raw '{"amount_micro":"3000","from":null,"nonce":null,"pay_to":"0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4","tx":"0xc741aa11e39c09bb0ec2975e7b6b738d7cea739d50b68524b2e05736c88bac8c"}' \
  | 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.aiskills402.com%2Fv1%2Frun%2Fbase-receipt-verify&method=POST
const res = await pay("https://api.aiskills402.com/v1/run/base-receipt-verify", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "amount_micro": "3000",
    "from": null,
    "nonce": null,
    "pay_to": "0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4",
    "tx": "0xc741aa11e39c09bb0ec2975e7b6b738d7cea739d50b68524b2e05736c88bac8c"
  }),
});
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.post(
        "https://api.aiskills402.com/v1/run/base-receipt-verify",
        json={
            "amount_micro": "3000",
            "from": None,
            "nonce": None,
            "pay_to": "0x8e37022edcf0f21cf3c9f93fee9d4d32519f36f4",
            "tx": "0xc741aa11e39c09bb0ec2975e7b6b738d7cea739d50b68524b2e05736c88bac8c",
        },
    )
    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 agoPassed402841 ms$0.005
9 h agoPassed40261 ms$0.005
14 h agoPassed402434 ms$0.005
19 h agoPassed402361 ms$0.005
24 h agoPassed402930 ms$0.005