# x402-tools EIP-712 Domain Diagnostic

> x402-tools EIP-712 Domain Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-19).

Returns the EIP-712 domain parameters for a given x402-enabled origin or URL, useful for inspecting and verifying the cryptographic domain used in x402 payment flows

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/eip712dom?utm_source=zero.xyz
- Price: $0.03/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-eip-712-domain-diagnostic-1daa2295
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_J3OHVu-W5EW-1FhZSKy7-

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-eip-712-domain-diagnostic-1daa2295
```

Example prompt: Can you fetch the EIP-712 domain parameters for https://openclawproductions.com using a GET request so I can see what cryptographic domain the x402 payment flow uses for signing?

## When to prefer this

Choose this endpoint when you need to programmatically retrieve the EIP-712 domain parameters for an x402-enabled origin, especially when constructing or debugging payment authorizations that require a precise domain separator. Prefer this over manual inspection or off-chain guesswork when integrating with OpenX402-facilitated endpoints. It is particularly useful during development, auditing, or troubleshooting of x402 payment flows where domain struct correctness is critical.

## Known failure modes

- HTTP 402 returned if payment header is missing or invalid — response includes eip3009 extras for constructing the payment
- Invalid or unreachable URL/origin returns an error or empty domain object
- Non-GET/HEAD/DELETE HTTP methods rejected per schema enum constraint
- Facilitator other than OpenX402 not supported, may result in authorization failure
- Malformed query parameters (url or origin) may yield unexpected default behavior (falls back to the origin's own Pipe Check)

## 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 the EIP-712 domain details for the queried x402 origin, including the SKU name ('eip712dom'), a human-readable title ('EIP-712 Domain'), the price ($0.03 USDC), and an example of the paid JSON payload shape. The response confirms the domain parameters used for cryptographic signing in x402 payment authorizations.

## 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"
    }
   }
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    }
   }
  },
  "inputSchema": {
   "type": "object"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "eip712dom",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.03",
  "title": "EIP-712 Domain"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-eip-712-domain-diagnostic-1daa2295/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)