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EVM Account Nonce Lookup
x402
EVM Account Nonce Lookup is a paid API for AI agents from api.x402node.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Returns the transaction count (nonce) for an Ethereum address across 7 EVM chains, distinguishing pending vs confirmed to reveal stuck mempool transactions and provide the correct next nonce for transaction construction.
Price / call$0.005
Success—
StatusUnknown
How this service works
Transaction count (nonce) for an address across 7 EVM chains, including pending vs confirmed to reveal stuck mempool transactions - agents need the correct nonce to build and send transactions and to detect pending txs. nonce, transaction count, account nonce, pending transactions, next nonce, tx count Accepts payment on Base or Solana — either network works.
Output
Returns the confirmed transaction count (nonce), the pending transaction count including mempool transactions, and the difference indicating any stuck or unconfirmed transactions for the queried address on the specified EVM chain.
Example use cases
Example prompt
“What's the current confirmed and pending nonce for wallet address 0xAbC123... on Base — I want to make sure there are no stuck mempool transactions before I submit my next tx.”
Technical details
Endpoint
GEThttps://api.x402node.dev/chain/account-nonceWhen to prefer
Use this endpoint when an agent needs to construct, sign, or broadcast EVM transactions and must know the correct nonce to avoid rejection or collision. Also ideal for detecting stuck pending transactions in the mempool across 7 EVM chains, where a single-chain RPC call would be insufficient or setting up your own multi-chain RPC infrastructure is impractical.
Side effects
- Invalid or malformed Ethereum address returns a 4xx error
- Unsupported chain identifier returns an error indicating valid chain options
- RPC backend unavailability for a specific chain may return a 5xx error
- Address with no transaction history returns nonce of 0 (not an error)
- Payment not included or insufficient results in HTTP 402 response
Input
{
"chain": "base",
"address": "0x742d35Cc6634C0532925a3b844Bc9e7595f42bE1"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"note": "Transaction count (nonce) for an address. nonce = next confirmed tx index; pendingTxs = txs in mempool not yet mined. Agents need the right nonce to build transactions and detect stuck/pending txs.",
"_hint": "x402 paid endpoints for AI agents — x402node.dev (utilities) · cn402.com (Chinese culture)",
"chain": "base",
"nonce": 0,
"source": "rpc",
"address": "0x742d35Cc6634C0532925a3b844Bc9e7595f42bE1",
"pendingTxs": 0,
"pendingNonce": 0
}Tags
x402
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