# Hearth x402 Seller Scores

> Hearth x402 Seller Scores is a paid API for AI agents from 138-197-15-135.sslip.io, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-31).

Returns ranked x402 API seller scores with trust, relevance, and usage metrics for discovering safe, affordable pay-per-call API endpoints

## Facts

- Endpoint: GET https://138-197-15-135.sslip.io/v1/x402/seller-scores?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/hearth-x402-seller-scores-0abc5b3d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UaBLhXBxDRFdD34E0xD6F

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 hearth-x402-seller-scores-0abc5b3d
```

Example prompt: Find me the top 5 trusted x402 search APIs priced under $0.02 each — I need something reliable for web search queries my agent will make repeatedly.

## When to prefer this

Use this endpoint when an AI agent needs to autonomously select a trustworthy, cost-effective x402 pay-per-call API from a ranked, scored list — especially before spending USDC on an unknown seller. Prefer it over manual API directories when you need trust signals, relevance scoring, and price filtering in a single call.

## Known failure modes

- Invalid category value returns empty or error response
- maxPrice set too low returns zero sellers
- n outside 1-20 range may be clamped or rejected
- No sellers indexed for the queried category returns empty sellers array
- Network or upstream indexing lag may return stale scores

## How this service works

Hearth's seller ranking data, per category (search, scrape, llm, image, enrich, onchain, price, social, weather, geo, audio, security) or free-text q: blended rank score with its parts, 30d paying usage, Hearth's own purchase outcomes (valid-response rate, latency), nightly liveness/payTo probe, and public reputation (402index reliability/uptime, vet402 verdict and settlement record, x402-trust grade), plus drop reasons. $0.005. Free sample: /v1/free/seller-scores?category=search

## Output

A JSON object with schema identifier 'hearth.seller-scores.v1', a category string, and an array of ranked sellers each containing the seller URL, price in USD, composite rank score, and sub-scores for trust, index402, and relevance/usage, plus a boolean recommended flag.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "queryParams"
   ],
   "properties": {
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "n": {
       "type": "string",
       "description": "Sellers 1-20 (default 10)"
      },
      "q": {
       "type": "string",
       "description": "Or free-text need"
      },
      "category": {
       "type": "string",
       "description": "Category: search, scrape, llm, image, enrich, onchain, price, social, weather, geo, audio, security"
      },
      "maxPrice": {
       "type": "string",
       "description": "Max seller price USD (default 0.05)"
      }
     }
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [],
     "properties": {
      "schema": {
       "type": [
        "string",
        "null"
       ]
      },
      "sellers": {
       "type": [
        "array",
        "null"
       ]
      },
      "category": {
       "type": [
        "string",
        "null"
       ]
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "schema": "hearth.seller-scores.v1",
  "sellers": [
   {
    "url": "https://seller.example/search",
    "priceUsd": 0.005,
    "rankScore": 6.1,
    "scoreParts": {
     "trust": 0.5,
     "index402": 0.9,
     "relevanceAndUsage": 4.9
    },
    "recommended": true
   }
  ],
  "category": "search"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/hearth-x402-seller-scores-0abc5b3d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from 138-197-15-135.sslip.io](https://www.zero.xyz/host/138-197-15-135.sslip.io/llms.txt)