# x402 Data API – Top APIs by Uptime

> x402 Data API – Top APIs by Uptime 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 a ranked list of x402 APIs sorted by 30-day uptime, then by number of payers and latency, with optional filtering by minimum payer count.

## Facts

- Endpoint: GET https://tb2s28fm0h8dkq2t.68r.lambda-web.us-east-1.on.aws/v1/uptime/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-uptime-10c1e4f0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_v7sMiukOeNn-xhKDFeiZD

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-uptime-10c1e4f0
```

Example prompt: Show me the top 20 most reliable x402 APIs from the last 30 days, but only include ones with at least 10 payers so I know they're actually being used.

## When to prefer this

Use this endpoint when you need to discover the most reliable x402 APIs available, especially when you want to filter to only APIs with proven payment activity (real payers). Prefer this over the 'most payers' endpoint when uptime/reliability is the primary criterion rather than popularity, and over the 'recently appeared' endpoint when you want established, stable APIs rather than new listings.

## Known failure modes

- Invalid limit value (outside 1–50 range) may return an error or be clamped
- min_payers filter too high may return an empty results array
- Service unavailability returns a non-200 HTTP response
- Payment failure (insufficient USDC balance) blocks the request entirely

## How this service works

x402 APIs ranked by the uptime we measure every 6 hours over 30 days, then by payers and latency, optionally only well-paid ones.

## Output

Returns a JSON array of up to 50 x402 API entries, each including: resource URL, number of uptime probes conducted, 30-day uptime ratio (0–1), median response latency in milliseconds, and number of distinct payers in the last 30 days. Results are sorted descending by uptime, then by payer count and latency.

## 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": {
      "limit": {
       "type": "integer",
       "description": "how many results (1-50, default 20)"
      },
      "min_payers": {
       "type": "integer",
       "description": "only APIs with at least this many payers (default 5)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "results": {}
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "results": [
   {
    "probes": 120,
    "resource": "https://api.example/v1/x",
    "median_ms": 140,
    "payers_30d": 61,
    "uptime_30d": 1
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-data-api-top-apis-by-uptime-10c1e4f0/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)