# WHP Standing — Wheeler Hubbell Publishing Verification Ping

> WHP Standing — Wheeler Hubbell Publishing Verification Ping is a paid API for AI agents from standing-guard-service.lovable.app, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-11).

Submits a subject and claim for machine-verifiable standing evaluation under explicit authority and bounds, returning a cryptographically signed verification record.

## Facts

- Endpoint: POST https://standing-guard-service.lovable.app/v1/ping?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/whp-standing-wheeler-hubbell-publishing-verification-ping-b58a89d2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kzYYRJ3EvFtMq2bm1VlqG

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 whp-standing-wheeler-hubbell-publishing-verification-ping-b58a89d2 -d '<json body>'
```

Example prompt: Can you verify standing for the subject 'Wheeler Hubbell Publishing LLC' with the claim 'This organization holds editorial authority over the registered work WHP-2024-001' and include provenance source 'WHP Registry' with authority 'Wheeler Hubbell Publishing'?

## When to prefer this

Choose this endpoint when you need a cryptographically signed, machine-verifiable attestation of a subject's standing under an explicit authority — particularly in publishing, content rights, or agent authorization contexts. It is distinct from simple content hashing or generic notarization services because it combines claim-based standing evaluation with Ed25519 signatures and provenance tracking. Prefer it when downstream systems need to independently verify both the integrity (via SHA-256 hash) and authenticity (via public key signature) of a standing claim.

## Known failure modes

- Missing required fields (subject or claim) returns a 400-level validation error
- Claim or subject exceeds maxLength limits (4000 and 2000 chars respectively) causes rejection
- Invalid bodyType or method enum value results in schema validation failure
- Payment not fulfilled (x402) results in 402 Payment Required before processing
- Service unavailability on lovable.app infrastructure returns 500 or timeout
- Malformed provenance object may be silently ignored or cause partial record

## How this service works

Machine-verifiable standing under explicit authority and bounds.

## Output

Returns a JSON object containing: a verification record with a 'not_sealed_mark' flag and type info, an Ed25519 digital signature (algorithm, base64url-encoded value, and public key), and a SHA-256 hex hash of the record — enabling downstream parties to cryptographically verify the authenticity and integrity of the standing evaluation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object",
     "required": [
      "subject",
      "claim"
     ],
     "properties": {
      "claim": {
       "type": "string",
       "maxLength": 4000,
       "minLength": 1
      },
      "subject": {
       "type": "string",
       "maxLength": 2000,
       "minLength": 1
      },
      "provenance": {
       "type": "object",
       "properties": {
        "source": {
         "type": "string"
        },
        "evidence": {
         "type": "array",
         "items": {}
        },
        "authority": {
         "type": "string"
        }
       }
      }
     }
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "record": {
   "type": "see VerificationPingResponse",
   "not_sealed_mark": true
  },
  "signature": {
   "alg": "Ed25519",
   "value_b64url": "base64url",
   "public_key_b64url": "base64url"
  },
  "record_hash": "sha256 hex"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/whp-standing-wheeler-hubbell-publishing-verification-ping-b58a89d2/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from standing-guard-service.lovable.app](https://www.zero.xyz/host/standing-guard-service.lovable.app/llms.txt)