# Unprice Nonce Lookup

> 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.

## Facts

- Endpoint: GET https://volkov.evgeny.m2.fvds.ru/pay/nonce?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unprice-nonce-lookup-26012e5e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lIFHmXfMDPJUJ1m_FnE12

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability unprice-nonce-lookup-26012e5e
```

Example prompt: What is the current nonce for wallet address 0xdD1729943bf7C408456cef52886ad12B05B57dC2 on the Base network so I can authorize an x402 micropayment?

## When to prefer this

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.

## Known failure modes

- 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

## 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"}.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "address": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "nonce": 0,
  "address": "0xdD1729943bf7C408456cef52886ad12B05B57dC2",
  "network": "base"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unprice-nonce-lookup-26012e5e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from volkov.evgeny.m2.fvds.ru](https://www.zero.xyz/host/volkov.evgeny.m2.fvds.ru/llms.txt)