# x402 Market Intel – Paid API Discovery

> x402 Market Intel – Paid API Discovery is a paid API for AI agents from x402-market-intel-mcp.mtree.workers.dev, paid per call via x402, $0.08/call, status unknown (last checked 2026-09-15).

Ranks and surfaces verified x402 pay-per-call API endpoints by buyer demand, price, registry coverage, schema quality, seller score, and route reliability

## Facts

- Endpoint: POST https://x402-market-intel-mcp.mtree.workers.dev/v1/x402/paid_api_discovery
- Price: $0.08/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-market-intel-paid-api-discovery-4322a6f9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WWrd_lJuiwRJ8lM9iYH_C

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-market-intel-paid-api-discovery-4322a6f9 -d '<json body>'
```

Example prompt: Search the x402 paid API directory for the top 5 data enrichment endpoints ranked by buyer demand and seller score, and include their prices and route reliability ratings.

## When to prefer this

Use this endpoint when an AI agent needs to programmatically discover and compare x402 pay-per-call APIs ranked by real usage signals (buyer demand, revenue proof, seller score) rather than relying on static directories or manual research. Ideal when the agent needs to select the best-fit paid API from multiple candidates based on quality signals.

## Known failure modes

- Payment not included or invalid x402 payment header — returns 402 with payment requirements
- Query too vague or no matching endpoints found — returns empty ranked list
- Invalid filter parameters — returns 400 with validation error
- Network or upstream registry unavailability — returns 503 or timeout

## How this service works

Paid API discovery for agents searching verified x402 APIs: rank pay-per-call endpoints by buyer demand, price, registry coverage, schema/examples, seller score, and route reliability. Price 0.25 USDC on Base via x402. Demo: https://x402-market-intel-mcp.mtree.workers.dev/demo/paid_api_discovery. Contact: https://x402-market-intel-mcp.mtree.workers.dev/contact.

## Output

A ranked list of verified x402 pay-per-call API endpoints with scores for buyer demand, price per call, registry coverage, schema/example quality, seller score, and route reliability — enabling the agent to choose the most trusted and relevant paid API for its task.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "properties": {
      "limit": {
       "type": "integer",
       "maximum": 100,
       "minimum": 1
      },
      "query": {
       "type": "string"
      },
      "category": {
       "type": "string"
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "graph": {},
  "top_resources": []
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-market-intel-paid-api-discovery-4322a6f9/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-market-intel-mcp.mtree.workers.dev](https://www.zero.xyz/host/x402-market-intel-mcp.mtree.workers.dev/llms.txt)