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Base Is-Contract Checker
x402
Base Is-Contract Checker is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).
Checks whether a given 0x address on the Base blockchain is a smart contract or an externally-owned account (EOA), and returns contract metadata including code size, minimal proxy detection, and implementation address.
Price / call$0.003
Success—
StatusUnknown
How this service works
Check whether a 0x address on Base is a smart contract or a plain wallet: bytecode size, and whether it is an EIP-1167 minimal proxy and which implementation it points to. Use before sending funds or approving a spender; for a fuller risk verdict use check_counterparty. A malformed address is rejected with 400, uncharged.
Output
Returns a JSON object with: chain name ('Base'), chainId (8453), the queried address, codeBytes (number of bytecode bytes at the address), isContract (true/false boolean), minimalProxy (true/false indicating EIP-1167 minimal proxy pattern), and implementation (the logic contract address if it's a proxy, or null).
Example use cases
Token contract verification before DeFi interaction
“Before I interact with it, can you check if 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is actually a smart contract on Base and not just a wallet address?”
Minimal proxy detection for security audit
“I'm auditing a Base address — can you tell me if 0x4200000000000000000000000000000000000006 is a minimal proxy contract and what its implementation address is?”
EOA vs contract classification for airdrop filtering
“I need to filter out non-contract addresses from my list — can you check if 0xd9aAEc86B65D86f6A7B5B1b0c42FFA531710b6CA on Base is a smart contract and how many bytes of code it has?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/base/is-contract?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to classify a Base-chain address as contract vs EOA, detect minimal proxy patterns, or retrieve code size — especially in DeFi, security, or compliance workflows where knowing whether an address holds executable code matters. Prefer this over generic Ethereum tools when the target chain is Base (chainId 8453).
Side effects
- Invalid or malformed 0x address returns an error
- Address not found on Base (e.g. address never deployed) returns isContract: false
- Network/RPC errors on Base may cause transient failures (not charged on failure)
- Non-checksummed addresses may cause validation errors
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "Base",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"chainId": 8453,
"codeBytes": 1855,
"isContract": true,
"minimalProxy": false,
"implementation": null
}
}Tags
x402
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