$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/preflight2
Calls / 30d
1
Unique payers / 30d
Aug 30
Last called
exact
Payment scheme
Call this service
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 -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
0x552cc4a10878c7f20574489d47184249657ca3f6USD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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