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BaseLens Contract Verification Lookup
x402
BaseLens Contract Verification Lookup is a paid API for AI agents from baselens-api.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Returns contract verification status, owner, proxy implementation, and Sourcify metadata for a given Base blockchain address
Price / call$0.003
Success—
StatusUnknown
How this service works
Base address, ERC-20 balance, token price, recent transfers, Basename/ENS resolve, contract verification, tx summaries and gas over x402 and MCP. $0.001–$0.004 USDC per call, no API key.
Output
A JSON object containing: isContract (boolean), owner address, Sourcify verification details (name, match type, verified flag), proxy implementation address if applicable, and any notes about upgradeability or contract structure.
Example use cases
Vetting a DeFi protocol contract
“Before I interact with this Base contract at 0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599, can you check if it's verified on Sourcify, whether it's a proxy, and what the implementation address is?”
Detecting EOA vs smart contract
“Can you tell me if 0x3ABd6df74F2E8Df5D0d103c7c5a5A21a9B2Cb85 on Base is actually a smart contract or just a regular wallet address?”
Auditing a token contract for ownership
“Who is the owner of the USDC contract on Base at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, and is it an upgradeable proxy? I need the verification details too.”
Technical details
Endpoint
GEThttps://baselens-api.vercel.app/v1/contract?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to verify whether a Base blockchain address is a smart contract, check its Sourcify verification status, discover proxy/implementation relationships, or identify contract ownership — all without managing an API key, paying only $0.003 USDC per call via x402.
Side effects
- Invalid or malformed address returns an error
- EOA (non-contract) addresses return isContract: false with limited data
- Unverified contracts return verified: false with no Sourcify name
- Rate limiting or payment failures via x402 protocol
- Address not found on Base mainnet
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"notes": [
"Upgradeable proxy…"
],
"owner": "0x3ABd…6df7",
"sourcify": {
"name": "FiatTokenProxy",
"match": "exact_match",
"verified": true
},
"isContract": true,
"proxyImplementation": "0x2Ce6…D779"
}
}Tags
x402
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