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EVM Address Nonce
x402
EVM Address Nonce 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).
Returns the next transaction nonce and pending nonce for any EVM address, and whether the address is a contract, via eth_getTransactionCount.
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 three fields: 'nonce' (the confirmed transaction count / next nonce to use for a new transaction), 'pendingNonce' (the nonce including pending mempool transactions), and 'isContract' (boolean indicating whether the address is a smart contract rather than an externally owned account).
Example use cases
Pre-signing nonce fetch for transaction
“Before I sign this transaction for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum mainnet, what's the correct nonce I should use?”
Detecting contract vs EOA address
“Is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 a smart contract or a regular wallet address on Ethereum?”
Pending nonce check for stuck transactions
“I think I have a stuck transaction — can you check the confirmed nonce and pending nonce for 0xAbCd1234567890abcdef1234567890abcdef1234 on Ethereum so I can figure out what replacement nonce to use?”
Technical details
Endpoint
POSThttps://flat-rate-llm.kikoribera03.workers.dev/v1/evm/nonceWhen to prefer
Use this endpoint when you need the correct nonce before constructing or signing an EVM transaction, or when you need to quickly determine whether an address is a smart contract vs an EOA. It is purpose-built for pre-transaction preparation and wraps eth_getTransactionCount with the added isContract signal in one call, saving a separate eth_getCode round-trip.
Side effects
- Invalid or malformed EVM address returns an error response
- Unsupported chain ID results in an error or empty response
- Network connectivity issues to the underlying RPC node may cause timeouts
- Address with no transactions returns nonce of 0, which is valid but may be misread as an error
- Missing required address parameter returns a 400-level error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | base | ethereum | polygon | arbitrum | optimism. |
| addressrequired | string | Address to look up. |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| nonce | number | |
| isContract | boolean | |
| pendingNonce | number |
Tags
x402
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