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x402 Trust Semantic Search
x402
x402 Trust Semantic Search is a paid API for AI agents from x402.fuchss.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).
Search the x402 endpoint catalog by natural language query and receive ranked matches with trust grades and similarity 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
A JSON object containing a ranked list of up to `limit` x402 endpoint matches, each with: endpoint ID, resource URL, trust grade (A–F or null if unscored), numeric trust score (0–100 or null), cosine similarity to the query, a short description, and a link to the full endpoint page on x402.fuchss.app. Results are sorted by cosine similarity with trust score as tiebreaker. Also includes total match count, the original query, and a timestamp.
Example use cases
Discover trusted weather APIs
“Search the x402 endpoint catalog for 'weather forecast' services and show me the top 3 results with their trust grades so I can pick the most reliable one.”
Find NLP processing endpoints
“I need an x402 endpoint that does sentiment analysis or text classification — search the catalog for the best 5 matches and include their trust scores.”
Locate image generation micropayment APIs
“Search x402 Trust for 'image generation' endpoints, limit to 10 results, and tell me which ones have trust grades so I know which are safe to pay.”
Technical details
Endpoint
POSThttps://x402.fuchss.app/v1/semantic-search?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to discover x402-compatible API endpoints by topic or capability description rather than by exact URL, especially when you want results pre-filtered by trust quality. Prefer this over a generic web search when you specifically want endpoints compatible with the x402 payment protocol and want cosine-similarity ranking combined with trust grades to surface reliable options quickly.
Side effects
- Empty query string returns no matches or an error
- Limit set to 0 or a negative integer may cause a bad request response
- Query too long or malformed JSON body returns 400
- No matching endpoints in catalog returns count:0 with empty matches array
- Payment failure (insufficient USDC) blocks the request before processing
- Endpoints with null grade/score indicate not yet evaluated by the trust system
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",
"similarity": 0.912,
"description": "Hyperlocal weather forecasts, priced per call.",
"endpointPage": "https://x402.fuchss.app/endpoint/12345"
},
{
"id": 12399,
"grade": null,
"score": null,
"resource": "https://wx.example.net/api/now",
"similarity": 0.874,
"description": null,
"endpointPage": "https://x402.fuchss.app/endpoint/12399"
}
],
"generatedAt": 1782826208450
}
}Tags
x402
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