# x402 Data API – Top APIs by Payers or Calls

> x402 Data API – Top APIs by Payers or Calls is a paid API for AI agents from tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-25).

Returns the most popular x402-gated APIs ranked by distinct payers or total calls in the last 30 days, with price and uptime data, optionally filtered by category.

## Facts

- Endpoint: GET https://tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/v1/market/top?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-25
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-data-api-top-apis-by-payers-or-calls-50b04a03
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_U1hNMAeV6EFZM7lXBB7fo

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-data-api-top-apis-by-payers-or-calls-50b04a03
```

Example prompt: Show me the top 10 x402 APIs in the 'llm & ai' category ranked by number of distinct payers over the last 30 days, including their prices and uptime.

## When to prefer this

Use this endpoint when you need a ranked leaderboard of x402-gated APIs by real usage (payers or call volume) with associated pricing and uptime metrics. It is ideal for API marketplace discovery, competitive analysis of x402 offerings, or helping developers find reliable and popular APIs to integrate. Prefer this over category or origin-specific endpoints when you want a broad, cross-market popularity ranking.

## Known failure modes

- Invalid 'by' value (not 'payers' or 'calls') returns an error
- Invalid 'limit' outside 1–50 range returns an error or defaults
- Unknown or misspelled category enum value returns an error
- No results returned if category has no qualifying APIs
- Endpoint temporarily unavailable returns a 5xx error

## How this service works

The x402 APIs with the most distinct payers (or calls) in the last 30 days, optionally within a category, with price and measured uptime.

## Output

A JSON array of up to 50 x402 API entries, each containing the resource URL, number of calls in the last 30 days, price in USD, number of distinct payers in the last 30 days, and measured uptime over 30 days, sorted by the requested ranking metric (payers or calls).

## 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"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "by": {
       "enum": [
        "payers",
        "calls"
       ],
       "type": "string",
       "description": "ranking (default payers)"
      },
      "limit": {
       "type": "integer",
       "description": "how many results (1-50, default 20)"
      },
      "category": {
       "enum": [
        "crypto & on-chain",
        "llm & ai",
        "web & search",
        "media",
        "finance",
        "social",
        "geo & weather",
        "developer tools",
        "other"
       ],
       "type": "string",
       "description": "only this category"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "by": {},
      "results": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "by": "payers",
  "results": [
   {
    "resource": "https://api.example/v1/x",
    "calls_30d": 6956,
    "price_usd": 0.005,
    "payers_30d": 227,
    "uptime_30d": 1
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-data-api-top-apis-by-payers-or-calls-50b04a03/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws](https://www.zero.xyz/host/tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/llms.txt)