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Ethereum Contract Info Lookup
x402
Ethereum Contract Info Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-18).
Returns contract detection, bytecode size and hash, EIP-1967 and legacy OpenZeppelin proxy slot values, and owner() for a single Ethereum mainnet address.
Price / call$0.003
Success—
StatusUnknown
How this service works
Call when an agent needs is_contract, bytecode size and hash, EIP-1967 and legacy OpenZeppelin proxy slots, and owner() for one Ethereum mainnet address. An EOA is is_contract false. Read-only. No spend. Send JSON {"address":"0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48"}. Exact $0.003 USDC on Base. Try unpaid POST /v1/sandbox/eth-contract-info first.
Output
A JSON object containing: is_contract (boolean indicating contract vs EOA), bytecode_size (integer byte count), bytecode_hash (keccak256 hash of deployed bytecode), EIP-1967 proxy implementation slot value, legacy OpenZeppelin proxy slot value, and owner() return value if the contract exposes it.
Example use cases
Verify proxy pattern before upgrade
“Before we upgrade this protocol, can you check if 0xC36442b4a4522E871399CD717aBDD847Ab11FE88 is an EIP-1967 proxy on Ethereum mainnet and what implementation address it currently points to?”
Distinguish EOA from contract in pipeline
“I'm processing a list of Ethereum addresses and need to know if 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 is just a regular wallet or an actual smart contract — can you check?”
Audit contract ownership on mainnet
“Who is the owner() of the Ethereum contract at 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, and is it a proxy? I need this for a security audit.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/eth-contract-info?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, single-call summary of an Ethereum mainnet address covering contract detection, bytecode fingerprinting, proxy pattern identification (EIP-1967 and legacy OpenZeppelin), and ownership — without writing custom RPC calls. It is read-only with no side effects, making it safe for audits, pipelines, and agent workflows. Use the free sandbox endpoint (/v1/sandbox/eth-contract-info) first to validate integration before paying $0.003 USDC per call on Base.
Side effects
- Invalid Ethereum address format — returns error indicating malformed input
- Address not found or network unreachable — may return error or empty result
- Contract has no owner() function — owner field absent or null in response
- Payment not included or insufficient — 402 Payment Required response; use /v1/sandbox/eth-contract-info for free testing
- Rate limiting or upstream Ethereum node failure — transient 5xx error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| address | string | Account on Ethereum mainnet. Example: 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 (Circle USDC). Returns is_contract, bytecode size and hash, proxy slots, and owner() when present. An EOA is is_contract false. |
Tags
x402
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