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EVM Contract or Wallet Detector
x402
EVM Contract or Wallet Detector is a paid API for AI agents from flat-rate-llm.kikoribera03.workers.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Determines whether an Ethereum address is a smart contract or a plain EOA wallet by checking its bytecode size via eth_getCode
Price / call$0.005
Success—
StatusUnknown
How this service works
60 paid endpoints with no metering, no API key and no account. Each endpoint has one flat price per call, whatever the size of the request: LLM completions with automatic failover across several large models, read-only EVM tooling over Base, Ethereum, Polygon, Arbitrum and Optimism, and pure crypto utilities that touch no network.
Output
Returns a JSON object with `isContract` (boolean: true if the address has deployed bytecode, false if it is a plain EOA wallet) and `bytecodeBytes` (integer: the size of the deployed bytecode in bytes, 0 for plain wallets).
Example use cases
Pre-transfer safety check on unknown address
“I'm about to send 5 ETH to 0xAbCd1234...5678 — can you first check whether that address is a smart contract or just a regular wallet on Ethereum mainnet so I know it's safe?”
Validate recipient is an EOA for airdrop
“We're doing a token airdrop and I need to confirm that 0x3f5CE5FBFe3E9af3971dD833D26bA9b5C936f0bE is a plain wallet, not a contract — can you verify that on mainnet?”
Inspect contract deployment status
“Can you tell me whether 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984 on Ethereum mainnet has any deployed bytecode and how large it is?”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/is-contractWhen to prefer
Choose this endpoint when you need a cheap, fast, read-only check to distinguish smart contract addresses from externally owned accounts (EOAs) on EVM-compatible chains before executing fund transfers, airdrops, or integrations. It is ideal as a pre-flight safety check in agentic workflows where sending funds to a contract vs. a wallet has different consequences. Prefer it over a full eth_call or transaction simulation when you only need to know whether code exists at an address and how large it is.
Side effects
- Invalid or malformed Ethereum address returns an error
- Unsupported chain/network identifier results in an error response
- Network timeout or RPC node unavailability may cause a failed response
- Address with no activity returns isContract: false with bytecodeBytes: 0 (indistinguishable from a fresh wallet)
- Self-destructed contracts may return bytecodeBytes: 0 even though they once had code
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | polygon | arbitrum | optimism. |
| addressrequired | string | Address to inspect. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| isContract | boolean | |
| bytecodeBytes | number |
Tags
x402
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