# OMNI Paid Integrity Verification API

> OMNI Paid Integrity Verification API is a paid API for AI agents from omni-x402-integrity.azzbackwardz01.chatgpt.site, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).

Verifies that base64-encoded content matches a pinned SHA-256 hash, returning signed execution and settlement evidence for each item checked.

## Facts

- Endpoint: POST https://omni-x402-integrity.azzbackwardz01.chatgpt.site/v1/verify?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/omni-paid-integrity-verification-api-764bd486
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_T7C7w8KFvtZtuybRwo357

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 omni-paid-integrity-verification-api-764bd486 -d '<json body>'
```

Example prompt: Can you verify that these three files haven't been tampered with? File 1 ID is 'report-2024-q1', its content is 'SGVsbG8gV29ybGQ=', and its expected SHA-256 is 'a948904f2f0f479b8f936e7b4cecd56b3c56b19f82a...'. Run the SHA-256 integrity check and give me back a signed verification result.

## When to prefer this

Choose this endpoint when you need cryptographic proof that content matches a known SHA-256 hash AND require a signed, machine-verifiable settlement receipt proving the check was paid for and executed — particularly useful in compliance, audit, or legal contexts where a payment-attested verification record adds evidentiary value. Prefer this over free hash-check utilities when the verification needs to be auditable and monetized as part of an automated agent workflow.

## Known failure modes

- Invalid base64 content causes decoding error
- SHA-256 hash format mismatch (not 64 lowercase hex characters) causes schema rejection
- Content hash does not match expected SHA-256 returns MISMATCH status
- More than 20 items submitted in a single request causes validation error
- Payment failure (insufficient USDC balance or x402 protocol error) blocks execution
- Empty items array rejected by minItems:1 constraint

## How this service works

Machine-payable SHA-256 pinned-evidence verification with signed execution and settlement evidence.

## Output

Returns a JSON object containing an overall_status field (e.g. 'MATCH' or 'MISMATCH') indicating whether all submitted items matched their expected SHA-256 hashes, along with a service_id and signed execution and settlement evidence for the transaction.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "inputs": {
   "type": "array",
   "items": {
    "type": "object",
    "required": [
     "id",
     "content_b64",
     "expected_sha256"
    ],
    "properties": {
     "id": {
      "type": "string",
      "maxLength": 128,
      "minLength": 1
     },
     "content_b64": {
      "type": "string",
      "description": "RFC 4648 standard Base64-encoded artifact bytes."
     },
     "expected_sha256": {
      "type": "string",
      "pattern": "^[0-9a-f]{64}$",
      "description": "Caller-pinned lowercase SHA-256 digest."
     }
    },
    "additionalProperties": false
   },
   "maxItems": 20,
   "minItems": 1
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "schema": {
  "type": "object",
  "required": [
   "service_id",
   "payment_id",
   "request_sha256",
   "result",
   "execution_proof",
   "receipt_url"
  ],
  "properties": {
   "result": {
    "type": "object",
    "required": [
     "overall_status",
     "items"
    ],
    "properties": {
     "items": {
      "type": "array",
      "items": {
       "type": "object",
       "required": [
        "id",
        "expected_sha256",
        "actual_sha256",
        "status",
        "byte_length"
       ],
       "properties": {
        "id": {
         "type": "string"
        },
        "status": {
         "enum": [
          "MATCH",
          "MISMATCH"
         ],
         "type": "string"
        },
        "byte_length": {
         "type": "integer",
         "minimum": 0
        },
        "actual_sha256": {
         "type": "string",
         "pattern": "^[0-9a-f]{64}$"
        },
        "expected_sha256": {
         "type": "string",
         "pattern": "^[0-9a-f]{64}$"
        }
       },
       "additionalProperties": false
      }
     },
     "overall_status": {
      "enum": [
       "MATCH",
       "MISMATCH"
      ],
      "type": "string"
     }
    },
    "additionalProperties": false
   },
   "payment_id": {
    "type": "string",
    "pattern": "^pay_[0-9a-f]{40}$"
   },
   "service_id": {
    "type": "string",
    "const": "pinned-evidence-integrity-verification/v1"
   },
   "receipt_url": {
    "type": "string",
    "format": "uri"
   },
   "request_sha256": {
    "type": "string",
    "pattern": "^[0-9a-f]{64}$"
   },
   "execution_proof": {
    "type": "object",
    "required": [
     "algorithm",
     "kid",
     "payload",
     "signature"
    ],
    "properties": {
     "kid": {
      "type": "string",
      "const": "urn:omni:sirfixall:receipt-key:sites-v1"
     },
     "payload": {
      "type": "object"
     },
     "algorithm": {
      "type": "string",
      "const": "EdDSA"
     },
     "signature": {
      "type": "string"
     }
    }
   }
  }
 },
 "example": {
  "result": {
   "overall_status": "MATCH"
  },
  "service_id": "pinned-evidence-integrity-verification/v1"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/omni-paid-integrity-verification-api-764bd486/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from omni-x402-integrity.azzbackwardz01.chatgpt.site](https://www.zero.xyz/host/omni-x402-integrity.azzbackwardz01.chatgpt.site/llms.txt)