# x402.fuchss.app Similar Endpoints Finder

> x402.fuchss.app Similar Endpoints Finder is a paid API for AI agents from x402.fuchss.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-13).

Given an x402 resource URL, returns semantically similar endpoints that have a higher trust score than the subject, helping agents avoid mediocre services

## Facts

- Endpoint: POST https://x402.fuchss.app/v1/similar
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-fuchss-app-similar-endpoints-finder-35f2dc1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_rqBrzx-ckB2krpZqDH7qE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-fuchss-app-similar-endpoints-finder-35f2dc1f -d '<json body>'
```

Example prompt: Before I pay https://some-mediocre.example.com/v1/weather, check if there are up to 5 x402 alternatives that do the same thing but have a trust score at least 10 points higher — I only want ones that clearly beat it.

## When to prefer this

Use this endpoint when an AI agent is about to call or pay for an x402 service and wants to verify it's not settling for a low-quality provider. Ideal before committing payment to any x402 endpoint with an unknown or mediocre trust profile. Prefer this over manual browsing or general search when you need semantically-matched, trust-ranked alternatives with scores and pricing in a single call.

## Known failure modes

- Resource URL not in observation set — endpoint returns error or empty result
- URL is malformed or missing scheme — validation error
- limit out of range (must be 1-25) — rejected with validation error
- minScoreDelta set too high — returns empty alternatives list even if similar endpoints exist
- Network or service unavailability — HTTP 5xx error
- Payment not processed correctly — HTTP 402 returned

## 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 JSON object with the subject endpoint's trust profile, a count of alternatives found, and an array of up to 25 alternative x402 endpoints. Each alternative includes its trust score (0-100), letter grade (A-F), cosine similarity to the subject's description, advertised price, and a free endpoint-page URL. Same-host siblings and flagged endpoints are excluded. Returns count=0 with an empty array when nothing beats the subject.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "limit": {
   "type": "integer"
  },
  "resource": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "note": "Semantically similar endpoints that out-score the subject. Similarity is cosine over description embeddings.",
  "count": 2,
  "subject": {
   "grade": "C",
   "score": 61.2,
   "vectorized": true,
   "inObservationSet": true
  },
  "resource": "https://api.example.com/v1/thing",
  "alternatives": [
   {
    "grade": "A",
    "score": 88.1,
    "network": "eip155:8453",
    "resource": "https://api.better.com/v1/thing",
    "amountUsd": 0.001,
    "similarity": 0.912,
    "endpointPage": "https://x402.fuchss.app/endpoint/12345",
    "recommendation": "proceed"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-fuchss-app-similar-endpoints-finder-35f2dc1f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.fuchss.app](https://www.zero.xyz/host/x402.fuchss.app/llms.txt)