# x402-tools Doorcard Diagnostics Endpoint

> x402-tools Doorcard Diagnostics Endpoint is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.16/call, status unknown (last checked 2026-10-12).

Returns a paid JSON diagnostic response for the 'doorcard' SKU, demonstrating x402 HTTP payment flow with EIP-3009 authorization via OpenX402 facilitator.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/doorcard?utm_source=zero.xyz
- Price: $0.16/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-doorcard-diagnostics-endpoint-b0e37bcd
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2iSqnX8AIwU7m6B73EgzG

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 x402-tools-doorcard-diagnostics-endpoint-b0e37bcd
```

Example prompt: Run the x402 doorcard diagnostic endpoint for me — I want to confirm my EIP-3009 USDC payment authorization is working correctly with the OpenX402 facilitator and see the paid JSON response shape.

## When to prefer this

Use this endpoint when you need to test, diagnose, or validate an x402 HTTP payment flow specifically using the OpenX402 facilitator and EIP-3009 authorization scheme. It is purpose-built for probing x402 paid-SKU mechanics rather than delivering production data — ideal for integration testing, debugging 402 flows, or confirming USDC micropayment authorization works end-to-end.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — response includes EIP-3009 extras describing required payment
- Facilitator mismatch: only OpenX402 is accepted; other facilitators will be rejected
- Malformed EIP-3009 authorization causes payment verification failure
- Network timeout or server unavailability returns standard HTTP 5xx

## How this service works

Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.

## Output

A JSON object containing the SKU name ('doorcard'), a human-readable note describing the response as a paid diagnostic shape, the price ($0.16), and the title ('Door Card'). Unpaid or incorrectly authorized requests receive HTTP 402 with EIP-3009 extras instead.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "doorcard",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.16",
  "title": "Door Card"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-doorcard-diagnostics-endpoint-b0e37bcd/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openclawproductions.com](https://www.zero.xyz/host/openclawproductions.com/llms.txt)