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Smart Contract Source Verification Check
x402
Smart Contract Source Verification Check is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-10-12).
Checks whether a smart contract's source code is verified on Etherscan, returning compiler version, license type, proxy status, and contract name across 60+ EVM chains.
Price / call$0.0216
Success—
StatusUnknown
How this service works
Check if a smart contract's source code is verified on Etherscan. Returns compiler version, license type, proxy status, and contract name. Unverified contracts are a red flag for token safety. Supports 60+ EVM chains.
Output
Returns whether the contract source code is verified on Etherscan, along with compiler version, SPDX license type, proxy status (is it a proxy contract), and the contract name. Unverified status is flagged as a red flag for token safety.
Example use cases
Example prompt
“Can you check if the contract at 0xdAC17F958D2ee523a2206206994597C13D831ec7 is verified on Etherscan on Ethereum mainnet (chain ID 1) — I want to know the compiler version, license, and whether it's a proxy?”
Technical details
Endpoint
GEThttps://api.strale.io/x402/contract-verify-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to quickly assess the safety and transparency of a smart contract by checking source code verification status on Etherscan. Ideal for token due diligence, DeFi security checks, and pre-investment screening across any of 60+ EVM-compatible chains. Prefer this over generic blockchain explorers when you need a structured, machine-readable response about verification metadata including proxy detection and license type.
Side effects
- Contract address not found on specified chain — returns unverified or not found status
- Invalid contract address format (not a valid 0x... address) — returns validation error
- Unsupported chain ID — returns error indicating chain is not supported
- Etherscan API unavailable for that chain — may return timeout or upstream error
- Contract exists but has never been verified — returns unverified status with no additional metadata
Input
{
"chain_id": "1",
"contract_address": "0xdAC17F958D2ee523a2206206994597C13D831ec7"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.0216,
"settlement_id": "0xf6911422064bdff7f618f42d9c580ed213993d5ddb1b3e1546ed9c2bcd1d0d78"
},
"capability": "contract-verify-check",
"latency_ms": 107,
"provenance": {
"source": "etherscan.io",
"fetched_at": "2026-06-13T04:27:16.431Z"
}
},
"chain_id": "1",
"is_proxy": false,
"evm_version": "Default",
"is_verified": true,
"license_type": null,
"contract_name": "TetherToken",
"compiler_version": "v0.4.18+commit.9cf6e910",
"contract_address": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
"optimization_used": false,
"implementation_address": null
}Tags
x402
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