Preflight

{
  "attestation": {
    "hash": "0x…",
    "signature": "0x…",
    "signer": "0x95b774e15D7DabFAd1aFc28055C24F78eBB8452A"
  },
  "delivery": {
    "last_delivery_at": "2026-09-27T09:00:00.000Z",
    "verified": true
  },
  "honeypot": {
    "flags": [],
    "label": "clean"
  },
  "liveness": {
    "http_status": 402,
    "last_ok_at": "2026-09-28T15:10:00.000Z",
    "latency_ms": 412,
    "ok_count": 14,
    "probe_count": 14,
    "status": "live"
  },
  "payability": {
    "declared_verb": "GET",
    "payable_verb": "GET",
    "verdict": "payable"
  },
  "payee": {
    "seen_onchain": true,
    "seller": {
      "endpoints": 12,
      "flags": [],
      "live": 11,
      "settlement_integrity": {
        "label": "organic",
        "score": 88
      }
    },
    "usdc_balance": 1840.5
  },
  "quality": {
    "total": 76
  },
  "quote": {
    "network": "eip155:8453",
    "pay_to": "0x52E29e0d2Aa49bfBfC548C0A9F2196F4aa51f3ea",
    "price_usd": 0.01,
    "scheme": "exact",
    "x402_version": 2
  },
  "reasons": [
    "live, payable on the declared verb, payee seen on-chain, no honeypot or seller flags"
  ],
  "recommendation": "pay",
  "url": "https://api.example.com/search"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://settled.tools/v1/preflight?url=https%3A%2F%2Fapi.example.com%2Fsearch'

# 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://settled.tools/v1/preflight?url=https%3A%2F%2Fapi.example.com%2Fsearch' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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%2Fsettled.tools%2Fv1%2Fpreflight
const res = await pay("https://settled.tools/v1/preflight?url=https%3A%2F%2Fapi.example.com%2Fsearch");
console.log(res.status, await res.text());

# 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://settled.tools/v1/preflight?url=https%3A%2F%2Fapi.example.com%2Fsearch")
    print(res.status_code, res.text)