# x402-tools Facilitator Diff Diagnostic

> x402-tools Facilitator Diff Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-13).

Inspects a given origin URL and returns x402 facilitator diagnostic differences, revealing payment-gating details and EIP-3009 extras for paid API access.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/facdiff?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-facilitator-diff-diagnostic-3e119788
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hRrGVeEviBlNBvnGFO4Hk

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-facilitator-diff-diagnostic-3e119788
```

Example prompt: Can you run the facdiff diagnostic on https://example.com/api/v1/data to see what x402 facilitator is assigned and what EIP-3009 extras come back on the 402 response?

## When to prefer this

Use this endpoint when you need to inspect and diagnose x402 payment-gating on a specific origin URL, particularly to retrieve EIP-3009 extras, confirm facilitator identity (OpenX402), and understand the full HTTP 402 response structure. Prefer this over generic HTTP inspection tools when the target is suspected to be x402-protected and you need structured facilitator diff output rather than raw headers.

## Known failure modes

- Origin URL not reachable — network error or timeout
- Origin does not implement x402 — no 402 response returned, diagnostic may return empty or error
- Payment not provided — unpaid requests return HTTP 402 with EIP-3009 extras (the service itself is paywalled at $0.03 USDC)
- Invalid origin URL format — missing or malformed input returns validation error
- Facilitator not OpenX402 — endpoint only recognizes OpenX402 as valid facilitator, others may return diff mismatch

## How this service works

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

## Output

Returns a JSON object containing x402 facilitator diagnostic data for the inspected origin URL, including facilitator identity (OpenX402), EIP-3009 payment extras embedded in the HTTP 402 response, paid SKU details, and any diff information between expected and actual facilitator configuration.

## 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": "Origin URL to inspect"
      }
     }
    }
   },
   "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": "facdiff",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.03",
  "title": "Fac Diff"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-facilitator-diff-diagnostic-3e119788/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)