api.spendpreflight.com

SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them. Verify a native Base USDC transfer by tx_hash (optional log_index), or exact pay_to + decimal amount + past start/end (max 90 days). Ambiguous matches fail without charge. Signed observation, OFAC flags, confirmations and printable HTML. Not invoice ownership or finality proof.

Open endpoint ↗

Price per call: $0.01
Chain: Base
Method: POST
Paid calls · 30 days: 1

Call it from code

This API is run by its own provider and paid directly through x402. We list it so you can find it; we don't route or hold the payment.

import { x402Client, wrapFetchWithPayment } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";

const client = new x402Client();
registerExactEvmScheme(client, { signer: agentAccount });

const pay = wrapFetchWithPayment(fetch, client);
const res = await pay("https://api.spendpreflight.com/v1/books/receipt", { method: "POST" });
console.log(await res.json());

https://api.spendpreflight.com/v1/books/receipt