Spend-guard preflight: deterministic 0-100 score for any x402 resource URL before an agent
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<=$5 (-10 above); +10 catalog; +15 Bazaar-listed; +10 age>=7d (+5 >=1d); -20 unreachable. Raw signals in every response; auditable. Not an endorsement.
10000 (raw units)
price
2
calls / 30d
1
unique payers
2026-08-30
updated
Provider
gateway.stride20k.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0x552Cc4A10878C7F20574489D47184249657Ca3f6",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"maxTimeoutSeconds": 60
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"resource": "https://gateway.stride20k.com/fx/:base/:quote"
},
"type": "http"
},
"output": {
"example": {
"data": {
"flags": [
"age-unknown-or-new"
],
"note": "Deterministic published rubric over the target's own public surfaces plus our collector archive. Presence and protocol validity, not an endorsement. NOT financial advice.",
"resource": "https://gateway.stride20k.com/fx/:base/:quote",
"score": 100,
"signals": {
"is402": true,
"listedInBazaarNow": true,
"network": "eip155:8453",
"observedAgeDays": 0.1,
"onChainBuyerCounts": "unavailable",
"payToPresent": true,
"priceUsd": 0.002,
"reachable": true,
"scheme": "exact",
"status": 402,
"termsDecodable": true,
"wellKnownPresent": true
}
},
"endpoint": "/v1/preflight",
"meta": {
"attribution": null,
"cached": false,
"fetchedAt": "2026-07-04T00:00:00.000Z",
"source": "direct probe of the target + Stride20k collector archive"
},
"ok": true
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"resource": {
"description": "The x402 resource URL to preflight, exactly as advertised.",
"pattern": "^https?://.+",
"type": "string",
"urlSafety": true
}
},
"required": [
"resource"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"properties": {
"flags": {
"items": {
"type": "string"
},
"type": "array"
},
"note": {
"type": "string"
},
"resource": {
"type": "string"
},
"score": {
"description": "0-100, deterministic published rubric.",
"type": "number"
},
"signals": {
"properties": {
"is402": {
"type": "boolean"
},
"listedInBazaarNow": {
"type": [
"boolean",
"null"
]
},
"network": {
"type": [
"string",
"null"
]
},
"observedAgeDays": {
"type": [
"number",
"null"
]
},
"onChainBuyerCounts": {
"type": "string"
},
"payToPresent": {
"type": "boolean"
},
"priceUsd": {
"type": [
"number",
"null"
]
},
"reachable": {
"type": "boolean"
},
"scheme": {
"type": [
"string",
"null"
]
},
"status": {
"type": [
"number",
"null"
]
},
"termsDecodable": {
"type": "boolean"
},
"wellKnownPresent": {
"type": "boolean"
}
},
"type": "object"
}
},
"required": [
"resource",
"score",
"flags",
"signals"
],
"type": "object"
},
"endpoint": {
"description": "Always \"/v1/preflight\".",
"type": "string"
},
"meta": {
"properties": {
"attribution": {
"description": "Licensing attribution when the source requires it.",
"type": [
"string",
"null"
]
},
"cached": {
"description": "Whether this response was served from cache.",
"type": "boolean"
},
"fetchedAt": {
"description": "ISO 8601 time the data was actually retrieved from the upstream.",
"type": "string"
},
"source": {
"description": "Upstream source: direct probe of the target + Stride20k collector archive.",
"type": "string"
}
},
"required": [
"source",
"cached",
"fetchedAt"
],
"type": "object"
},
"ok": {
"description": "true on success.",
"type": "boolean"
}
},
"required": [
"ok",
"endpoint",
"data",
"meta"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://gateway.stride20k.com/v1/preflight" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://gateway.stride20k.com/v1/preflight");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://gateway.stride20k.com/v1/preflight")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/1158.json, and this resource appears in /discovery/resources and /discovery/search.