# 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, $0.005/call, status unknown (last checked 2026-10-31).

Verifies that a piece of text matches an expected SHA-256 hash, returning a signed MATCH/MISMATCH result with settlement evidence, paid per-call via x402.

## Facts

- Endpoint: GET https://omni-x402-integrity.azzbackwardz01.chatgpt.site/v1/verify-text?utm_source=zero.xyz
- Price: $0.005/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-62ae1e04
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_H-KNiN1z1twhrUO19x7NT

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-62ae1e04
```

Example prompt: Can you verify the integrity of this document — its ID is 'contract-v3-final', the content in base64 is 'SGVsbG8gV29ybGQ=', and I expect its SHA-256 to be 'a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e'? I need the signed MATCH/MISMATCH result.

## When to prefer this

Choose this endpoint when you need a machine-payable, cryptographically signed record proving that a specific piece of text matches an expected SHA-256 hash — especially in automated pipelines, compliance workflows, or multi-party audits where a simple local hash comparison isn't sufficient because you need third-party signed execution evidence and a payment-settled audit trail.

## Known failure modes

- Invalid or malformed SHA-256 hash (not 64 lowercase hex characters) returns a validation error
- Base64-encoded content that cannot be decoded returns a decode error
- Missing required query parameters (id, content_b64, expected_sha256) returns a 400-level error
- Payment failure or insufficient USDC balance blocks the request before verification
- Content that does not match the hash returns MISMATCH status rather than an error
- Server-side hashing or signing failure returns a 500-level error

## How this service works

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

## Output

A JSON object with a 'result' field containing 'overall_status' (MATCH or MISMATCH) and a 'service_id' field ('pinned-evidence-integrity-verification/v1'), plus signed execution and settlement evidence confirming the verification was paid and performed.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "queryParams"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "id",
      "content_b64",
      "expected_sha256"
     ],
     "properties": {
      "id": {
       "type": "string",
       "maxLength": 128,
       "minLength": 1
      },
      "content_b64": {
       "type": "string",
       "description": "RFC 4648 standard Base64-encoded artifact bytes."
      },
      "expected_sha256": {
       "type": "string",
       "pattern": "^[0-9a-f]{64}$",
       "description": "Caller-pinned lowercase SHA-256 digest."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## 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-62ae1e04/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)