# Rubric Protocol Independent Audit & Attestation Verification

> Rubric Protocol Independent Audit & Attestation Verification is a paid API for AI agents from rubric-protocol.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Performs an independent cryptographic audit of a Rubric attestation, verifying signature validity, HCS sequence integrity, and Hedera mirror-node confirmation, returning a signed verdict with its own attestation ID.

## Facts

- Endpoint: POST https://rubric-protocol.com/v1/x402/verify-audit
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/rubric-protocol-independent-audit-attestation-verification-cc6bdbca
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_KSdNTUzHZYgJAdyFIzyhh

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 rubric-protocol-independent-audit-attestation-verification-cc6bdbca -d '<json body>'
```

Example prompt: Can you independently audit this Rubric attestation to confirm the signature is valid, the HCS sequence checks out, and Hedera's mirror node recorded it — and give me back a signed verdict I can cite as evidence?

## When to prefer this

Choose this endpoint when you need an independent, citable audit of a Rubric attestation — not just internal validation. It is the right choice when regulatory, legal, or compliance contexts require a third-party-signed verdict with its own attestation ID, or when you need cryptographic assurance that a Hedera HCS-anchored attestation has not been tampered with.

## Known failure modes

- Invalid or malformed attestation input — returns error indicating unrecognizable attestation format
- Signature verification failure — verdict returned with failed signature validity status
- HCS sequence mismatch — verdict indicates sequence inconsistency on Hedera
- Mirror-node unreachable or timeout — returns error if Hedera mirror node cannot be queried
- Payment failure — request blocked if USDC payment of $0.002 is not settled via x402

## How this service works

Independent audit of a Rubric attestation: signature validity, HCS sequence, and direct Hedera mirror-node confirmation.

## Output

A signed audit verdict containing: signature validity status, HCS sequence check result, Hedera mirror-node confirmation, and a new attestation ID for the verdict itself — which can be cited independently as verifiable evidence of the audit.

## 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",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "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"
    },
    "format": {
     "type": "string"
    },
    "example": {}
   },
   "additionalProperties": false
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/rubric-protocol-independent-audit-attestation-verification-cc6bdbca/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rubric-protocol.com](https://www.zero.xyz/host/rubric-protocol.com/llms.txt)