S

Stride20k · Preflight

by Stride20k

GETBase

$0.01

per call · USD Coin on Base

Spend-guard preflight: deterministic 0-100 score for any x402 resource URL before an agent pays it. One SSRF-guarded probe of the live 402 (terms decode, payTo, price sanity) plus origin /.well-known/x402.json plus our collector's Bazaar presence and observed age. Rubric: start 50; +15 valid 402; +10 terms decode; +5 payTo; +5 price<=$5 (-10 above); +10 catalog; +15 Bazaar-listed; +10 age>=7d (+5 >=1d); -20 unreachable. Raw signals in every response; auditable. Not an endorsement.

Endpoint

GET https://gateway.stride20k.com/v1/preflight

2

Calls / 30d

1

Unique payers / 30d

Aug 30

Last called

exact

Payment scheme

Call this service

TypeScript · @x402/fetch
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);

const res = await fetchWithPay("https://gateway.stride20k.com/v1/preflight", {
  method: "GET",
});
const data = await res.json();
cURL
curl -X GET \
  "https://gateway.stride20k.com/v1/preflight?resource=https%3A%2F%2Fgateway.stride20k.com%2Ffx%2F%3Abase%2F%3Aquote" \
  -H "X-PAYMENT: <signed x402 payment>"

Example response

{
  "data": {
    "flags": [
      "age-unknown-or-new"
    ],
    "note": "Deterministic published rubric over the target's own public surfaces plus our collector archive. Presence and protocol validity, not an endorsement. NOT financial advice.",
    "resource": "https://gateway.stride20k.com/fx/:base/:quote",
    "score": 100,
    "signals": {
      "is402": true,
      "listedInBazaarNow": true,
      "network": "eip155:8453",
      "observedAgeDays": 0.1,
      "onChainBuyerCounts": "unavailable",
      "payToPresent": true,
      "priceUsd": 0.002,
      "reachable": true,
      "scheme": "exact",
      "status": 402,
      "termsDecodable": true,
      "wellKnownPresent": true
    }
  },
  "endpoint": "/v1/preflight",
  "meta": {
    "attribution": null,
    "cached": false,
    "fetchedAt": "2026-07-04T00:00:00.000Z",
    "source": "direct probe of the target + Stride20k collector archive"
  },
  "ok": true
}

Payment details

Pay to0x552cc4a10878c7f20574489d47184249657ca3f6
AssetUSD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913
NetworksBase
Schemesexact

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