# ProofAudit.ai Audit Evidence Verification

> ProofAudit.ai Audit Evidence Verification is a paid API for AI agents from proofaudit.ai, paid per call via x402, $0.025/call, status unknown (last checked 2026-10-17).

Captures, verifies, and returns audit-ready evidence packs with sealed SHA-256 proof hashes for credit, compliance, and financial operations.

## Facts

- Endpoint: GET https://proofaudit.ai/api/x402?utm_source=zero.xyz
- Price: $0.025/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/proofaudit-ai-audit-evidence-verification-a8bd5699
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_l4m2LVU2HdKI9I6z0cT1g

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 proofaudit-ai-audit-evidence-verification-a8bd5699
```

Example prompt: I need to generate a tamper-proof audit receipt for a credit approval we just processed — can you use ProofAudit to seal it and give me the SHA-256 proof hash and verification status?

## When to prefer this

Choose ProofAudit when you need cryptographically sealed, tamper-evident audit trails for financial approvals, credit decisions, or compliance workflows — especially when regulators or auditors require exportable evidence packs with verifiable SHA-256 hashes anchored to the Base blockchain. Prefer this over generic document storage when immutability and verifiability are required.

## Known failure modes

- Payment not received — returns 402 if the $0.025 USDC x402 payment is missing or malformed
- Invalid HTTP method — only GET, HEAD, and POST are accepted
- Verification failure — verified field returns false if the evidence could not be sealed
- Network unavailability — Base network congestion may delay or fail the sealing operation
- Malformed query parameters — additionalProperties not conforming to string type may be rejected

## How this service works

Capture, verify, approve, and export audit-ready evidence packs for credit, compliance, and financial operations.

## Output

Returns a JSON object containing: success and verified boolean flags, a sealed SHA-256 proof hash (e.g. PROOF-87B43B8D...), the network (Base), a protocol token contract address, and a link to the nodes portal for further verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input",
  "output"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "POST"
     ],
     "type": "string"
    },
    "headers": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    },
    "queryParams": {
     "type": "object",
     "additionalProperties": {
      "type": "string"
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type",
    "example"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ticker": "PROOF",
  "network": "base",
  "service": "ProofAudit.ai",
  "success": true,
  "verified": true,
  "nodesPortal": "https://proofaudit.ai/nodes",
  "sealedSha256": "PROOF-87B43B8DEB11505A",
  "protocolToken": "0x87b43b8dEb11505ADc6898899961d6d419CaBB07"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proofaudit-ai-audit-evidence-verification-a8bd5699/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proofaudit.ai](https://www.zero.xyz/host/proofaudit.ai/llms.txt)