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Stride20k x402 Preflight Score
x402
Stride20k x402 Preflight Score is a paid API for AI agents from gateway.stride20k.com, paid per call via x402, $0.01/call, status down (last checked 2026-10-12).
Returns a deterministic 0-100 trust score for any x402 resource URL before an agent pays for it, by probing the live 402 response, well-known manifest, Bazaar listing, and observed age.
Price / call$0.01
Success—
StatusDown
How this service works
Spend-guard preflight: deterministic 0-100 score for an x402 resource URL before an agent pays it. Probes GET by default, or a caller-supplied/discoverable GET or POST method and JSON body. Decodes asset-aware terms and only scores USD price sanity for recognized USD-pegged default assets, plus origin /.well-known/x402.json, Bazaar presence, and observed age. Raw signals in every response; auditable. Not an endorsement.
Output
A JSON object with ok:true/false, a deterministic 0-100 trust score, an array of human-readable flags (e.g. 'valid_402', 'bazaar_listed', 'price_ok'), and a signals object containing: reachable boolean, is402 boolean, termsDecodable, payToPresent, priceUsd, wellKnownPresent, listedInBazaarNow, observedAgeDays, onChainBuyerCounts, network, scheme, and status code. Also includes cache metadata and fetchedAt timestamp.
Example use cases
Vet micropayment endpoints before agent payments
“I'm about to let you call a new x402 API that charges per request. Can you check how trustworthy it is first? Give me the trust score and let me know if there are any red flags I should worry about.”
Audit x402 resources in bulk for safety
“I have a list of x402 service URLs we might integrate with. Run a trust check on each one and sort them by score so we only consider the highest-rated, safest ones.”
Monitor Bazaar-listed x402 providers
“Can you check if this x402 endpoint is actually listed in Bazaar and tell me how long it's been observed in the ecosystem? I want to make sure it's a real, established provider before we start paying for it.”
Technical details
Endpoint
GEThttps://gateway.stride20k.com/v1/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever an AI agent is about to pay for an x402 resource and needs a fast, auditable, pre-payment trust signal. It is the only endpoint that combines live 402 probe, well-known manifest check, Bazaar catalog presence, and observed age into a single deterministic rubric score. Prefer it over manual inspection or other validators when you need a machine-readable risk score with raw signals for downstream logic.
Side effects
- resource URL is unreachable — score penalized by -20 and reachable:false returned
- resource URL is not a valid http/https URL — 400-level error
- target URL times out during SSRF-guarded probe — score reflects unreachability
- Bazaar lookup unavailable — listedInBazaarNow returned as null
- score is 0-100 but is not an endorsement — low score means high risk, not guaranteed fraud
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"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.",
"flags": [
"age-unknown-or-new"
],
"score": 100,
"signals": {
"is402": true,
"scheme": "exact",
"status": 402,
"network": "eip155:8453",
"priceUsd": 0.002,
"reachable": true,
"payToPresent": true,
"termsDecodable": true,
"observedAgeDays": 0.1,
"wellKnownPresent": true,
"listedInBazaarNow": true,
"onChainBuyerCounts": "unavailable"
},
"resource": "https://gateway.stride20k.com/fx/:base/:quote"
},
"meta": {
"cached": false,
"source": "direct probe of the target + Stride20k collector archive",
"fetchedAt": "2026-07-04T00:00:00.000Z",
"attribution": null
},
"endpoint": "/v1/preflight"
}
}Tags
x402
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