# Ontario Protocol x402 Endpoint Checker

> Ontario Protocol x402 Endpoint Checker is a paid API for AI agents from ontarioprotocol.com, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-13).

Tests and validates x402-compliant API endpoints for HTTP 402 responses, manifests, pricing, and public readiness before an agent pays

## Facts

- Endpoint: POST https://ontarioprotocol.com/api/x402/list-agent
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ontario-protocol-x402-endpoint-checker-3e0a8565
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-XOOgBjdRuKekwFQ7Hrqj

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 ontario-protocol-x402-endpoint-checker-3e0a8565 -d '<json body>'
```

Example prompt: Before I integrate this x402 endpoint at https://myservice.com/api/data, can you run an Ontario Protocol check on it to verify the HTTP 402 response, manifest, and pricing are all set up correctly and it's publicly discoverable?

## When to prefer this

Choose this endpoint when you need to verify that an x402-compliant API is correctly configured before an agent attempts to pay and call it, or before a provider publishes their endpoint for agent consumption. It is specifically suited for x402 protocol validation rather than general API health checks or payment processing.

## Known failure modes

- Target URL is unreachable or returns non-402 status — validation fails with error details
- Malformed manifest at the target endpoint — report flags specific schema violations
- Endpoint not yet indexed for discovery — readiness report shows discovery as incomplete
- Invalid or missing pricing declaration — pricing check returns failure with guidance
- Rate limit or upstream timeout — call returns error without a listing result

## How this service works

Find the first reason agents are not buying your x402 API. Test HTTP 402 readiness, Coinbase Bazaar retrieval, buyer-task fit, and agent payment policy free.

## Output

A JSON object containing a listing record with an endpoint ID and associated validation results covering HTTP 402 compliance, manifest structure, pricing metadata, and public discovery readiness status.

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "listing": {
   "id": "agent_example"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ontario-protocol-x402-endpoint-checker-3e0a8565/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ontarioprotocol.com](https://www.zero.xyz/host/ontarioprotocol.com/llms.txt)