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skills.onesource.io Wallet Nonce Lookup
x402
skills.onesource.io Wallet Nonce Lookup is a paid API for AI agents from skills.onesource.io, paid per call via x402, $0.003000/call, not verified (last probed 2026-10-27); live alternatives: Codex GraphQL API ($0.001) and AgenticFi Block Height Lookup ($0.001).
Agents call it through Zero, which pays per call: no API key and no wallet of your own. New accounts start with $5. Live alternatives for the same use case: Codex GraphQL API ($0.001) · AgenticFi Block Height Lookup ($0.001).
Fetches the current on-chain transaction nonce for a given Ethereum-compatible wallet address at a specified block.
Price / call$0.003000
Success—
StatusUnknown
How this service works
Fetches the current nonce for a given wallet address on-chain.
Output
Returns a hex-encoded nonce value (e.g. '0x678') representing the number of transactions sent from the wallet address, along with request metadata including the endpoint path and a unique request ID.
Example use cases
Verify wallet transaction history before sending
“Check how many transactions have been sent from my wallet 0x742d35Cc6634C0532925a3b844Bc9e7595f42e7 so I know what nonce to use for my next transaction”
Audit pending transactions across network
“Get the pending nonce for address 0x8ba1f109551bD432803012645Ac136ddd64DBA72 on Base network to see if any transactions are still processing”
Monitor wallet activity on multiple chains
“What's the current transaction count for wallet 0xd8da6bf26964af9d7eed9e03e53415d37aa96045 on Avalanche to help me track its recent activity”
Technical details
Endpoint
GEThttps://skills.onesource.io/api/chain/nonce/0xd8da6bf26964af9d7eed9e03e53415d37aa96045?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically determine the current transaction nonce for an Ethereum-compatible wallet on supported networks (ethereum, base, avax, sepolia, megaeth). Ideal for transaction construction, replay attack prevention checks, or auditing wallet activity count. Supports multiple block tags including latest, pending, and finalized.
Side effects
- Invalid wallet address format returns validation error
- Unsupported network value returns enum mismatch error
- Invalid block reference (malformed hex) returns parsing error
- Network timeout or RPC node unavailability returns 5xx error
- Address with no transactions returns nonce of 0x0
Input
{
"block": "latest",
"network": "ethereum"
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| block | — | |
| address | string | |
| network | string |
Output
{
"data": {
"nonce": "0x1708"
},
"meta": {
"endpoint": "/api/chain/nonce/0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
"request_id": "18978e08f9ab33d5"
}
}Schema · Response
| Field | Type | Description |
|---|---|---|
| datarequired | object | |
| metarequired | object |
Tags
x402
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