SpendPreflight

SpendPreflight — trust and verification tools for stablecoin payments, built for AI agents and the people who run them. Check a supplied x402 challenge or cart against caller spending/sanctions rules and cached index evidence. Returns allow/hold/block, reasons and a receipt. Missing/stale evidence stays unknown; no live merchant fetch, signing, settlement or custody. An allow result is not identit

Open endpoint ↗

Price per call: $0.02
Chain: Base
Method: POST
Paid calls · 30 days: 5

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/preflight", { method: "POST" });
console.log(await res.json());

https://api.spendpreflight.com/v1/preflight