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x402 Trust Semantic Search
x402
x402 Trust Semantic Search is a paid API for AI agents from x402-trust.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Searches the x402 Trust index for x402 payment endpoints matching a natural-language query, returning ranked results with trust grades and scores
Price / call$0.001
Success—
StatusUnknown
How this service works
Trust, reputation & reliability scores for x402 endpoints. We monitor every listed x402 service 24/7: uptime probes, 402-envelope compliance, price history, and real on-chain USDC settlement volume. Free grade & recommendation for any endpoint, $0.005 for a full data breakdown.
Output
Returns a ranked list of up to `limit` x402 endpoint matches, each containing: a numeric endpoint ID, letter-grade trust rating (A–F or null if unscored), numeric trust score (0–100 or null), the resource URL, price in USD (or null), cosine similarity to the query, a short description, a link to the full endpoint page on x402-trust.com, and a priceCeiling flag. Also includes total match count, the original query, and a generation timestamp.
Example use cases
Find trusted AI inference endpoints
“Search x402 Trust for the top 10 x402 APIs for running LLM inference, ranked by trust score — I want to see their grades and prices before committing to one.”
Discover cheap data enrichment services
“Find me x402 endpoints for company enrichment or firmographic data — return up to 5 results so I can compare their trust grades and USDC prices.”
Locate a fallback API when primary fails
“My primary x402 weather API just went down — search x402 Trust for up to 3 alternative weather forecast endpoints and tell me their trust scores so I can pick a reliable backup.”
Technical details
Endpoint
POSThttps://x402-trust.com/v1/semantic-searchWhen to prefer
Use this endpoint when an AI agent needs to discover x402-compatible payment endpoints by semantic description rather than exact URL — especially when comparing options by trust grade, uptime reliability, or price before committing to a paid API call. Prefer over manual browsing or raw x402scan listings when trust ranking and semantic similarity are needed together.
Side effects
- Query too vague returns low-similarity, unrelated endpoints
- Endpoints in index may not yet have trust scores (grade and score return null)
- Limit parameter ignored or capped at server maximum
- Price data absent for newly listed or unmonitored endpoints
- Service returns empty matches array if no endpoints match the query
- Malformed request body returns 4xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| limit | integer | |
| query | string |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Ranked by cosine similarity, with trust score as a tiebreaker. score/grade are null when the endpoint is not yet scored. No verdict or flag detail here: POST /v1/x402-trust carries those.",
"count": 2,
"query": "weather forecast",
"matches": [
{
"id": 12345,
"grade": "A",
"score": 88.1,
"resource": "https://api.weather.example/v1/forecast",
"amountUsd": 0.002,
"similarity": 0.912,
"description": "Hyperlocal weather forecasts, priced per call.",
"endpointPage": "https://x402-trust.com/endpoint/12345",
"priceCeiling": false
},
{
"id": 12399,
"grade": null,
"score": null,
"resource": "https://wx.example.net/api/now",
"amountUsd": null,
"similarity": 0.874,
"description": null,
"endpointPage": "https://x402-trust.com/endpoint/12399",
"priceCeiling": false
}
],
"generatedAt": 1782826208450
}
}Tags
x402
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