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Ethereum Wallet Nonce Lookup
x402
Ethereum Wallet Nonce Lookup is a paid API for AI agents from agent-data-tools.revmesh2074.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-28).
Returns the current confirmed and pending transaction nonce for an Ethereum address, plus whether the address has ever sent a transaction.
Price / call$0.01
Success—
StatusUnknown
How this service works
Read the transaction count (nonce) of a 0x address on Ethereum, both confirmed and including pending transactions. Use to build the next transaction or to tell whether an address has ever sent anything; for its balance use eth_balance. A malformed address is rejected with 400, uncharged.
Output
A JSON object with the wallet address, the confirmed transaction nonce, the pending nonce (including mempool), a boolean indicating whether the address has ever sent a transaction, the chain name (Ethereum), and the chain ID (1).
Example use cases
Pre-transaction nonce check
“Before I broadcast this Ethereum transaction, can you check the current confirmed and pending nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 so I know the right sequence number to use?”
Wallet activity verification
“Has the Ethereum address 0xAbCd1234567890abcdef1234567890ABCDEF1234 ever sent any transactions? What's its current nonce?”
Stuck transaction diagnosis
“I think I have a stuck transaction. Can you pull the confirmed nonce and the pending nonce for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Ethereum so I can see if there's a gap?”
Technical details
Endpoint
GEThttps://agent-data-tools.revmesh2074.workers.dev/eth/nonce?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to read the Ethereum mainnet transaction nonce for a wallet, especially before constructing or troubleshooting transactions. It is pay-per-call with no API key required, making it ideal for ad-hoc agent workflows. Use sibling endpoints for other chains (Base, Arbitrum, Optimism, Polygon) if those networks are needed.
Side effects
- Invalid or malformed 0x address returns an error response
- Address with no on-chain history may return nonce 0 and hasSent false
- Network or RPC node outage may cause a timeout or 5xx error
- Missing required 'address' query parameter returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| addressrequired | string | 0x address |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| chain | string | |
| nonce | number | |
| address | string | |
| chainId | number | |
| hasSent | boolean | |
| pendingNonce | number |
Tags
x402
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