# Paddock API Domain Liveness Check

> Paddock API Domain Liveness Check is a paid API for AI agents from paddock.finance, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).

Returns real-time liveness, latency, and reliability metrics for a given API domain tracked by Paddock's AI agent commerce data layer

## Facts

- Endpoint: GET https://paddock.finance/api/paddock/mcp/liveness
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/paddock-api-domain-liveness-check-5d7bf448
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UV4eUDpMH1FzM5K5K3Yvz

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 paddock-api-domain-liveness-check-5d7bf448
```

Example prompt: Can you check Paddock to see if api.stripe.com is currently live and what its 7-day success rate and p95 latency look like?

## When to prefer this

Use this endpoint when you need real-time uptime and reliability data for a specific API domain that AI agents are known to call, especially for x402-enabled paid APIs tracked by Paddock. Prefer this over generic uptime monitors when you want agent-commerce-specific metrics like payment method, quality score, and success rate from an AI-native data layer.

## Known failure modes

- Domain not found in Paddock's index — returns empty or null fields
- Invalid or malformed hostname input — may return 400 or empty result
- Domain has no recent probe data — samples_7d may be 0 and last_probed_at may be stale
- Network timeout if Paddock's liveness probe infrastructure is unreachable
- Payment not processed — x402 payment of 0.001 USDC required per call or request is rejected

## How this service works

Paddock per-domain liveness lookup — one-time query

## Output

Returns a JSON object with: whether the domain is up (boolean), the tool/service name, a quality score, the domain itself, payment method used, number of samples in the last 7 days, timestamp of last probe, p50 and p95 latency in milliseconds, and the 7-day success rate as a decimal.

## 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",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "up": true,
  "tool": "get_liveness",
  "domain": "api.openai.com",
  "latency_p50_ms": 120,
  "success_rate_7d": 0.99
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/paddock-api-domain-liveness-check-5d7bf448/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from paddock.finance](https://www.zero.xyz/host/paddock.finance/llms.txt)