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EVM Wallet Nonce Lookup
x402
EVM Wallet Nonce Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-30).
Returns the confirmed nonce, pending nonce, next nonce to use, and number of transactions waiting in the mempool for a given wallet address across 12 EVM chains.
Price / call$0.003
Success—
StatusUnknown
How this service works
Confirmed and pending nonce of a wallet, next nonce to use and transactions waiting in the mempool. Works on Base, Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, Avalanche, Gnosis, Linea, Scroll, Sonic and Unichain.
Output
A JSON object containing the chain name, wallet address, confirmed nonce (nonce_confirmado), pending nonce (nonce_pendiente), the next recommended nonce to use (siguiente_nonce), and the count of transactions currently waiting in the mempool (transacciones_en_espera).
Example use cases
Detecting stuck mempool transactions
“Check if wallet 0xAbC1234...5678 has any transactions stuck in the mempool on Arbitrum and tell me the current confirmed vs pending nonce so I know if something is queued up.”
Finding next safe nonce before sending a tx
“I'm about to send a transaction from 0xDead...Beef on Polygon — what nonce should I use to make sure it doesn't collide with anything already pending?”
Monitoring wallet activity across chains
“Tell me the confirmed and pending nonce for 0x1234...abcd on Optimism so I can see whether any unconfirmed transactions are still in flight.”
Technical details
Endpoint
POSThttps://api.vextorium.com/evm-nonce-pago?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time nonce state for a specific wallet on any of the 12 supported EVM chains — particularly when managing transaction sequencing, detecting stuck/pending transactions, or determining the correct nonce before submitting a new transaction. Prefer this over block explorer APIs when you need a unified multi-chain interface with mempool visibility in a single call.
Side effects
- Invalid or malformed wallet address returns an error
- Unsupported chain value causes a validation error (must be one of: base, ethereum, arbitrum, optimism, polygon, bnb, avalanche, gnosis, linea, scroll, sonic, unichain)
- Missing required 'direccion' field in body returns a schema validation error
- Network timeout or RPC node unavailability may result in a service error
- Payment failure (insufficient USDC balance) blocks the request under the x402 protocol
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| red | string | Chain (default base) |
| direccion | string |
Output
Schema · Response
{
"type": "json",
"example": {
"red": "base",
"wallet": "0xb9f06D2734B7E9D7b21B64C4D8b95bd774b71aCf",
"nonce_pendiente": 1,
"siguiente_nonce": 1,
"nonce_confirmado": 1,
"transacciones_en_espera": 0
}
}Tags
x402
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