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EVM Account Nonce Lookup
x402
EVM Account Nonce Lookup is a paid API for AI agents from bess-x402.onrender.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).
Returns the next transaction nonce, pending tx count, native balance, contract flag, and EIP-7702 delegate for an EVM address across major chains.
Price / call$0.002
Success—
StatusUnknown
How this service works
Next transaction nonce of an EVM address (confirmed and pending), pending tx count, native balance, contract flag and EIP-7702 delegate. Use before signing or to detect stuck transactions.
Output
Returns a JSON object containing the confirmed nonce (next nonce for confirmed transactions), pending nonce (accounting for mempool transactions), pending transaction count, native token balance (ETH/MATIC etc.), a boolean flag indicating whether the address is a contract, and the EIP-7702 delegate address if one is set.
Example use cases
Prevent stuck transaction before signing
“Before I broadcast this transaction, check the current nonce for 0xAbCd1234...5678 on Base so I can make sure I'm not using a duplicate or skipping a nonce.”
Detect stuck pending transactions
“Can you check how many pending transactions are queued for 0x742d35Cc6634C0532925a3b844Bc454e4438f44e on Ethereum? I think a transaction might be stuck.”
Verify if address is a smart contract
“Is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum a smart contract or a regular wallet address?”
Technical details
Endpoint
GEThttps://bess-x402.onrender.com/v1/evm/nonce?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need accurate nonce management before signing EVM transactions, want to detect stuck or pending transactions, need to check native balances alongside nonce data, or want to determine if an address is an EOA or smart contract — all in a single call across five major EVM chains. Prefer it over manual RPC calls when you need a paid, reliable, hosted endpoint without managing your own node infrastructure.
Side effects
- Invalid or malformed 0x address returns a 4xx error
- Unsupported chain name returns an error — only ethereum, base, arbitrum, optimism, polygon are valid
- RPC node unavailability may cause timeouts or 5xx errors
- ENS names not supported — raw 0x addresses required
- Missing required 'address' query parameter returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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