# VeriDoc Document Authenticity Verifier

> VeriDoc Document Authenticity Verifier is a paid API for AI agents from www.getbags.app, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-15).

Verifies whether a document was registered on the Ethereum Sepolia blockchain by checking its keccak-256 hash on-chain

## Facts

- Endpoint: GET https://www.getbags.app/api/agent/link/pl-b7d021d3-ebd0-46be-8a8f-54158c8864d3
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/veridoc-document-authenticity-verifier-23ea597e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_52yR960KQgmrpwdipBj_Q

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 veridoc-document-authenticity-verifier-23ea597e
```

Example prompt: Can you verify whether this document was officially registered on the blockchain? Its keccak-256 hash is 0x3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b.

## When to prefer this

Use this endpoint when you need to cryptographically verify document authenticity using blockchain registration without uploading sensitive file contents. Ideal for privacy-sensitive use cases involving certificates, contracts, academic transcripts, or legal documents where you already have the keccak-256 hash and want to confirm on-chain registration status on Ethereum Sepolia.

## Known failure modes

- Hash not found on-chain — document was never registered or hash is incorrect
- Invalid hash format — must be a valid keccak-256 0x-prefixed hex string
- Payment failure — $0.05 USDC x402 payment on Base not completed
- Ethereum Sepolia node connectivity issues causing lookup failure
- Malformed JSON body — missing or improperly formatted hash field

## How this service works

VeriDoc verifies document authenticity on Ethereum Sepolia. Send a keccak-256 hash of a file; get back whether that exact document was registered on-chain and when. Privacy-first — the file is never uploaded, only the hash. Use for certificates, contracts, transcripts, or any registered document. POST JSON {"hash":"0x…"}. Speaks x402 — $0.05 USDC/call on Base, no account or API key needed.

## Output

Returns whether the document hash was found registered on Ethereum Sepolia and, if so, the timestamp of when it was registered on-chain. No file data is ever transmitted — only the hash is checked.

## 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": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/veridoc-document-authenticity-verifier-23ea597e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.getbags.app](https://www.zero.xyz/host/www.getbags.app/llms.txt)