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Unprice Nonce Lookup
x402
Unprice Nonce Lookup is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-10).
Returns a nonce value associated with a blockchain address on the Base network, used for payment authentication with the x402 protocol.
Price / call$0.001
Success—
StatusUnknown
How this service works
Tiny paid web services for agents. Pay per request with USDC on Base via x402, plus non-x402 Base USDC tx-hash checkouts for Merchant Feed Audit, Base USDC receipts, and recent wallet statements.
Output
Returns a JSON object containing a numeric nonce, the queried wallet address, and the network name (e.g. 'base'). Example: {"nonce": 0, "address": "0xdD1729943bf7C408456cef52886ad12B05B57dC2", "network": "base"}.
Example use cases
Authorize x402 micropayment request
“Before I send an x402 payment, get me the current nonce for my Base wallet 0xdD1729943bf7C408456cef52886ad12B05B57dC2 so I can sign the transaction correctly.”
Verify wallet nonce before signing
“Fetch the nonce for address 0xabc1234567890def1234567890abcdef12345678 on Base — I need it to make sure my next signed message doesn't get rejected.”
Automate pay-per-request API calls
“My agent needs to automatically retrieve the nonce for my wallet 0xdD1729943bf7C408456cef52886ad12B05B57dC2 each time before making a paid API call through the x402 protocol on Base.”
Technical details
Endpoint
GEThttps://volkov.evgeny.m2.fvds.ru/pay/nonce?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to retrieve the current nonce for a Base network wallet address as part of the x402 pay-per-request authentication flow, particularly before signing micropayment transactions. Prefer this when building agents that need to automate x402 payment sequences on the Base blockchain.
Side effects
- Invalid or malformed wallet address returns an error response
- Missing address parameter may return default or error
- Network unavailability causes timeout or 5xx error
- Payment of $0.001 USDC not processed correctly results in 402 response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"nonce": 0,
"address": "0xdD1729943bf7C408456cef52886ad12B05B57dC2",
"network": "base"
}
}Tags
x402
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