# Contract Source Code Verification Status Checker

> Contract Source Code Verification Status Checker is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-02).

Checks whether a smart contract's source code is verified on a block explorer for a given EVM chain and address

## Facts

- Endpoint: POST https://twin.unykorn.org/contract-verified?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/contract-source-code-verification-status-checker-76ba7c52
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_YLwNALuxy1hEr04Vgmw88

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 contract-source-code-verification-status-checker-76ba7c52 -d '<json body>'
```

Example prompt: Is the source code for the contract at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 verified on Ethereum's block explorer?

## When to prefer this

Choose this endpoint when you need a quick, paid, multi-chain lookup of whether a specific smart contract's source code is verified on its respective block explorer, especially if you are already using the UnyKorn/Genesis402 ecosystem for other on-chain data queries. It supports 10 major EVM chains in a single API surface. Prefer this over manually scraping Etherscan or similar explorer websites, or when you need a reliable programmatic answer with a payment receipt for auditing.

## Known failure modes

- Invalid or malformed contract address (not matching 0x + 40 hex chars) returns an error
- Unsupported chain name not in the allowed enum causes a validation error
- Contract address does not exist on the specified chain may return ok: false or an error
- Network timeouts querying remote block explorer APIs
- Payment failure if insufficient USDC balance for the $0.006 fee

## How this service works

Is a contract's source code verified on the explorer — Genesis402 / UnyKorn Operator Network

## Output

Returns a boolean ok field indicating whether the contract's source code is verified on the block explorer for the specified chain, along with a payment receipt containing the transaction hash, USD amount charged, and a unique receipt ID for auditing purposes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "chain": {
     "enum": [
      "ethereum",
      "base",
      "polygon",
      "arbitrum",
      "optimism",
      "bsc",
      "avalanche",
      "gnosis",
      "linea",
      "scroll"
     ],
     "type": "string"
    },
    "address": {
     "type": "string",
     "pattern": "^0x[0-9a-fA-F]{40}$"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "contract-verified",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.006,
   "receipt_id": "g402-<16hex>"
  },
  "generated_at": "<iso8601>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/contract-source-code-verification-status-checker-76ba7c52/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)