# Agent Paywire URL Payment Protocol Check

> Agent Paywire URL Payment Protocol Check is a paid API for AI agents from api.agentpaywire.com, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-29).

Checks whether a given public URL supports AI agent payment protocols (x402/L402) and returns a detailed compliance report

## Facts

- Endpoint: GET https://api.agentpaywire.com/v1/check?utm_source=zero.xyz
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-paywire-url-payment-protocol-check-ad2a83a4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_42IQPAiGmY2DZzXFuE1_Y

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 agent-paywire-url-payment-protocol-check-ad2a83a4
```

Example prompt: Can you check whether https://api.example.com/v1/weather supports the x402 or L402 payment protocol so I know if my agent can pay for it automatically?

## When to prefer this

Choose this endpoint when you need to programmatically verify whether a specific public URL supports AI agent-native payment protocols (x402 or L402) before integrating it into an agentic workflow. It is ideal for pre-flight checks in agent pipelines, auditing directories of paid APIs, or debugging payment negotiation failures. Prefer this over manual inspection or generic HTTP probing tools when you want structured, protocol-aware compliance reports specific to machine-to-machine payment standards.

## Known failure modes

- URL is not publicly reachable — network error or timeout returned
- URL does not implement any payment protocol — paid: false with fail counts in summary
- Invalid or malformed URL provided — validation error
- Endpoint requires authentication before protocol headers are visible
- Rate limiting or upstream errors from the target server interfere with probing

## How this service works

Check whether a public URL exposes L402, x402, or MPP discovery. Send url as a query parameter. POST JSON {"url":"https://..."} is the same check. Two free reports per client per 24 hours, then 0.05 USDC. A request without url is the payment challenge and does not use a free report.

## Output

Returns a JSON object with the queried URL, a boolean 'paid' flag indicating payment protocol support, and a 'report' object containing the protocol name (e.g. 'l402+x402'), a summary of pass/fail test counts, and detailed compliance test results.

## 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 http or https URL. Required. POST JSON {\"url\":\"https://...\"} is the same check."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "required": [
      "url",
      "paid",
      "report"
     ],
     "properties": {
      "url": {
       "type": "string"
      },
      "paid": {
       "type": "boolean"
      },
      "report": {
       "type": "object"
      }
     }
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://api.example.com/v1/weather",
  "paid": true,
  "report": {
   "ok": true,
   "url": "https://api.example.com/v1/weather",
   "summary": {
    "fail": 0,
    "pass": 4
   },
   "protocol": "l402+x402"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-paywire-url-payment-protocol-check-ad2a83a4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentpaywire.com](https://www.zero.xyz/host/api.agentpaywire.com/llms.txt)