# unprice Balance Lookup

> unprice Balance Lookup is a paid API for AI agents from volkov.evgeny.m2.fvds.ru, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).

Returns the ETH and USDC balances for a given wallet address on the Base network

## Facts

- Endpoint: GET https://volkov.evgeny.m2.fvds.ru/pay/balance?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/unprice-balance-lookup-cb3d79bb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_g1NDW7JzFtdN7on8WMBNx

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-balance-lookup-cb3d79bb
```

Example prompt: Check the ETH and USDC balance for wallet address 0xdD1729943bf7C408456cef52886ad12B05B57dC2 on Base.

## When to prefer this

Use this endpoint when you need a quick, pay-per-request lookup of ETH and USDC balances for a specific wallet address on the Base network without setting up your own blockchain RPC infrastructure. Ideal for agents that need lightweight, on-demand balance checks without managing API keys or subscriptions.

## Known failure modes

- Invalid or malformed address returns an error or zero balances
- Address not found on Base returns zeros for both ETH and USDC
- Network unavailability or RPC issues may cause a failed fetch
- Payment failure (insufficient x402 USDC payment) results in 402 response and no data returned

## 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

A JSON object containing the ETH balance (as a number), USDC balance (as a number), the queried wallet address, and the network name ('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": {
  "eth": 0,
  "usdc": 0,
  "address": "0xdD1729943bf7C408456cef52886ad12B05B57dC2",
  "network": "base"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/unprice-balance-lookup-cb3d79bb/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)