# SiteCheck API Liveness & Latency Benchmark

> SiteCheck API Liveness & Latency Benchmark is a paid API for AI agents from api.fadeandco.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Checks whether a public HTTPS endpoint is up by issuing three GET requests and returning each HTTP status, response-header latency, median time, worst time, and an UP/DEGRADED/DOWN health level.

## Facts

- Endpoint: GET https://api.fadeandco.workers.dev/api/agent-intel/api-sla-liveness-benchmark?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-api-liveness-latency-benchmark-9ee75aee
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kTu6H5wH9PutbFrr_BCxH

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 sitecheck-api-liveness-latency-benchmark-9ee75aee
```

Example prompt: Can you check if https://api.example.com/health is up right now — I need to know the response times and whether it's UP, DEGRADED, or DOWN?

## When to prefer this

Choose this endpoint when you need a quick, single-location liveness and latency snapshot of a public HTTPS endpoint without setting up a full monitoring service. It is ideal for pre-flight checks before calling a dependency, ad-hoc incident triage, or automated workflow gates that need a UP/DEGRADED/DOWN classification with raw latency data. Prefer alternatives if you need multi-region availability data, TLS handshake timing, or sustained periodic monitoring.

## Known failure modes

- Target URL is unreachable or returns non-2xx — reflected in DOWN level and status codes in samples
- Invalid or non-HTTPS URL provided — likely 4xx or error response from the endpoint itself
- Target server blocks automated requests — may falsely appear DOWN
- All three requests time out — worst-case latency captured but level will be DOWN
- Single-vantage-point limitation — does not reflect regional outages or CDN edge failures

## How this service works

Pay-per-call agent intelligence, token risk, developer and AI data tools for AI agents, from public chains and public sources. Payment: x402, USDC on Base, Solana, Arc, Polygon, Arbitrum, Monad, World Chain, Optimism, Avalanche, Celo or Stellar, or RLUSD/XRP on the XRP Ledger. No signup, no API key; a failed call is not charged.

## Output

A JSON object containing: the probed URL, an UP/DEGRADED/DOWN level, an array of individual sample objects each with HTTP status code and latency in ms, the medianMs, worstMs, a checkedAt ISO timestamp, the count of successful samples, and a note clarifying it is a single-vantage-point measurement only.

## 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",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "description": "Public https:// endpoint address"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://httpbin.org/status/200",
  "note": "One vantage point, three requests. Not a multi-region SLA measurement.",
  "level": "UP",
  "source": "https://httpbin.org/status/200",
  "samples": [
   {
    "ms": 134,
    "status": 200
   },
   {
    "ms": 540,
    "status": 200
   }
  ],
  "worstMs": 540,
  "medianMs": 134,
  "checkedAt": "2026-10-23T09:35:21.936Z",
  "successfulSamples": 3
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-api-liveness-latency-benchmark-9ee75aee/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fadeandco.workers.dev](https://www.zero.xyz/host/api.fadeandco.workers.dev/llms.txt)