# x402-tools WK Accept Null Diagnostic

> x402-tools WK Accept Null Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Returns a paid JSON diagnostic payload for the 'wkacceptnull' SKU, gated behind x402 micropayment ($0.02 USDC); unpaid requests receive HTTP 402 with EIP-3009 payment metadata.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/wkacceptnull?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-wk-accept-null-diagnostic-d55b6bbc
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_4BYYMTm1NKrw3rvYFUhpe

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-wk-accept-null-diagnostic-d55b6bbc
```

Example prompt: Run the wkacceptnull x402 diagnostic against openclawproductions.com using a GET request so I can see the paid JSON payload and verify the EIP-3009 402 challenge is formatted correctly.

## When to prefer this

Use this endpoint when you need to test, debug, or validate an x402 micropayment integration — specifically to inspect the EIP-3009 402 challenge format, confirm OpenX402 facilitator compatibility, or verify the shape of a paid diagnostic JSON response. Not suitable for production data retrieval or non-x402 payment flows.

## Known failure modes

- HTTP 402 returned when no valid x402 payment header is provided — expected behavior, includes EIP-3009 payment metadata
- Invalid or unsupported HTTP method (only GET, HEAD, DELETE accepted) returns an error
- Payment facilitator mismatch (only OpenX402 supported) may cause settlement failure
- Malformed origin URL in queryParams may cause request rejection
- Stale or replayed EIP-3009 authorization may be rejected by facilitator

## How this service works

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

## Output

On successful payment: a JSON object containing the SKU name ('wkacceptnull'), a diagnostic note, the price string ('$0.02'), and a title ('WK Accept Null'). On unpaid request: HTTP 402 with EIP-3009 payment challenge extras specifying how to pay via OpenX402 facilitator.

## 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",
     "properties": {
      "origin": {
       "type": "string",
       "description": "Public origin URL. Defaults to https://openclawproductions.com."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  },
  "inputSchema": {
   "type": "object",
   "required": [
    "type",
    "properties"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "object"
    },
    "required": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "properties": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "wkacceptnull",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "WK Accept Null"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-wk-accept-null-diagnostic-d55b6bbc/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)