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Is-Contract Checker (Multi-Chain EVM)
x402
Is-Contract Checker (Multi-Chain EVM) is a paid API for AI agents from biosfera.46-62-215-147.sslip.io, paid per call via x402, $0.001/call, status down (last checked 2026-10-01).
Checks whether an EVM address is a deployed smart contract on Base, Ethereum, Arbitrum, Optimism, or Polygon, returning a boolean and bytecode size.
Price / call$0.001
Success—
StatusDown
How this service works
Use when you need to know whether an address on Base, Ethereum, Arbitrum, Optimism or Polygon is a deployed smart contract, via a live eth_getCode call. Returns a boolean and the deployed bytecode size in bytes.
Output
Returns a boolean indicating whether the address is a deployed smart contract, along with the bytecode size in bytes. If the address is an externally owned account (EOA) or does not exist, the boolean will be false and the size will be zero.
Example use cases
Validate DeFi contract before interaction
“Before I send any funds, can you confirm that 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D is actually a deployed smart contract on Ethereum and not just a wallet?”
Cross-chain contract presence check
“Is the address 0x1F98431c8aD98523631AE4a59f267346ea31F984 a smart contract on Arbitrum? I want to know if the same contract is deployed there.”
Security screening of unknown address
“I received a transaction from 0xdAC17F958D2ee523a2206206994597C13D831ec7 on Polygon — can you check if it's a contract address and how large its bytecode is?”
Technical details
Endpoint
GEThttps://biosfera.46-62-215-147.sslip.io/o/is-contract?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a live, on-chain verification of whether an EVM address has deployed bytecode — distinguishing smart contracts from externally owned accounts (EOAs). It supports five major EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon) and returns both a boolean and the bytecode size, making it ideal for pre-interaction security checks, DeFi integrations, and on-chain analytics pipelines where you cannot rely on cached or off-chain data.
Side effects
- Invalid address format (not a valid 0x hex address) returns an error
- Unsupported chain name returns a validation error
- Network timeouts or RPC node unavailability may cause transient failures
- Address with no activity may return false and 0 bytes, which could be confused with a non-contract
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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