# Base Mainnet ETH & USDC Balance Checker

> Base Mainnet ETH & USDC Balance Checker is a paid API for AI agents from vending-machine-seven.vercel.app, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-13).

Returns live ETH and USDC balances for a given EVM address on the Base mainnet blockchain

## Facts

- Endpoint: GET https://vending-machine-seven.vercel.app/api/v/base-balance
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/base-mainnet-eth-usdc-balance-checker-a61a7163
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_a0Qgq04BESz83yIAlCi1V

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 base-mainnet-eth-usdc-balance-checker-a61a7163
```

Example prompt: Can you check the live ETH and USDC balances on Base mainnet for the wallet address 0x4f3edf983ac636a65a842ce7c78d9aa706d3b113?

## When to prefer this

Use this endpoint when you need real-time ETH and USDC balances specifically on the Base mainnet network for treasury management, agent wallet funding checks, or pre-payment verification. Prefer this over generic multi-chain balance tools when Base-specific live data is required.

## Known failure modes

- Invalid or malformed 0x address returns an error response
- Address not found on Base mainnet may return zero balances
- RPC or node connectivity issues may cause lookup failures
- Missing required 'address' query parameter returns a validation error
- Non-EVM address format (e.g. ENS name without resolution) rejected

## How this service works

Live Base mainnet ETH and USDC balances for an address — treasury and agent wallet checks

## Output

Returns a JSON object with fields: ok (boolean success flag), eth (ETH balance as string), usdc (USDC balance as string), chain (network identifier, e.g. 'base'), source (data source), and service (service name).

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "address"
     ],
     "properties": {
      "address": {
       "type": "string",
       "description": "0x EVM address on Base"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "ok": {
       "type": "boolean"
      },
      "eth": {
       "type": "string"
      },
      "usdc": {
       "type": "string"
      },
      "chain": {
       "type": "string"
      },
      "source": {
       "type": "string"
      },
      "service": {
       "type": "string"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/base-mainnet-eth-usdc-balance-checker-a61a7163/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vending-machine-seven.vercel.app](https://www.zero.xyz/host/vending-machine-seven.vercel.app/llms.txt)