# PaywallWatch Ping

> PaywallWatch Ping is a paid API for AI agents from api.paywallwatch.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Returns an OK status and server timestamp as a paid x402 end-to-end connectivity test costing one cent.

## Facts

- Endpoint: GET https://api.paywallwatch.com/v1/ping?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/paywallwatch-ping-c5d15940
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QiY0JyfBF57NoGYdv4QQi

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 paywallwatch-ping-c5d15940
```

Example prompt: Can you send a live x402 ping to PaywallWatch to confirm my payment client is working end-to-end? It costs one cent and should come back with an OK and the server time.

## When to prefer this

Choose this endpoint when you need a real, cheap, live end-to-end test of an x402 HTTP payment client implementation. It is ideal as a smoke test or integration check before calling more expensive paid APIs, or when debugging why an x402 client is failing to complete payments.

## Known failure modes

- Payment failure if x402 client is misconfigured or lacks sufficient USDC balance
- HTTP 402 returned if payment headers are missing or malformed
- Network timeout if the endpoint is temporarily unreachable
- Invalid or missing x402 payment token causes rejection without processing

## How this service works

Use when testing an x402 client end to end. Returns ok and the server time; costs one cent.

## Output

Returns an HTTP 200 response with a JSON body containing an 'ok' status indicator and the current server time, confirming the paid x402 request completed successfully.

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/paywallwatch-ping-c5d15940/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.paywallwatch.com](https://www.zero.xyz/host/api.paywallwatch.com/llms.txt)