8021 Attribution Checker

Validate whether Base blockchain transactions are 8021 attributed by checking if the last 16 bytes of input data match the pattern 80218021802180218021802180218021.

Learn more: ERC-8021

Quick Start

npm install
npm run dev

Open http://localhost:3000 and enter a transaction hash.

API

Verify Attribution

Endpoint: POST /api/v1/verify

Request:

{
  "hash": "0x...",
  "isUserOperation": false
}

Field	Type	Description
hash	string	Transaction or userOperation hash
isUserOperation	boolean	Set true for Account Abstraction transactions

Response:

{
  "success": true,
  "attributed": true,
  "data": {
    "hash": "0x...",
    "isUserOperation": false,
    "schemaId": 0,
    "codes": ["baseapp"],
    "suffix": "80218021802180218021802180218021",
    "inputData": "0x..."
  }
}

Example:

curl -X POST https://your-domain.com/api/v1/verify \
  -H "Content-Type: application/json" \
  -d '{"hash": "0x6e864ef...", "isUserOperation": false}'

Also supports GET /api/v1/verify?hash=0x...&isUserOperation=false