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OneSource Ethereum Transaction Nonce Lookup
x402
OneSource Ethereum Transaction Nonce Lookup is a paid API for AI agents from api.onesource.io, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).
Returns the next transaction nonce (transaction count) for any Ethereum wallet address via eth_getTransactionCount
Price / call$0.003
Success—
StatusUnknown
How this service works
Next transaction nonce for any Ethereum wallet via eth_getTransactionCount - how many txs it has sent
Output
Returns the transaction nonce (count of transactions sent) for the specified Ethereum address, representing the next nonce to use when constructing a new transaction. Can be queried at a specific block number, block tag (latest, pending, earliest, safe, finalized), or hex block reference.
Example use cases
Example prompt
“What's the next nonce for Ethereum wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on mainnet — I need to know how many transactions it has sent so I can sign my next transaction correctly.”
Technical details
Endpoint
GEThttps://api.onesource.io/api/chain/nonce/:addressWhen to prefer
Use this endpoint when you need to determine the correct nonce for constructing and signing a new Ethereum transaction, or when you need to audit how many transactions a wallet has sent. Useful for transaction sequencing, replay protection, and wallet activity checks. Supports both mainnet and Sepolia testnet, and allows querying at specific historical blocks for forensic or analytical purposes.
Side effects
- Invalid Ethereum address format (not 0x + 40 hex chars) — returns validation error
- Unknown network value other than 'ethereum' or 'sepolia' — returns error
- Invalid block parameter format — returns validation error
- Node RPC timeout or upstream Ethereum node unavailability — returns 5xx error
- Payment failure (x402) — returns 402 Payment Required
Input
{
"block": "latest",
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"network": "ethereum"
}Output
{
"data": {
"nonce": "0x1708"
},
"meta": {
"endpoint": "/api/chain/nonce/0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"request_id": "57e2fc6b1466bbb6"
}
}Tags
x402
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