# VendSDK Base Network ETH & USDC Balance Lookup

> VendSDK Base Network ETH & USDC Balance Lookup is a paid API for AI agents from vendsdk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-15).

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

## Facts

- Endpoint: GET https://vendsdk.com/api/v/base-balance
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vendsdk-base-network-eth-usdc-balance-lookup-19ae1e90
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_n0KEwqOFsitBkjlsNysji

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 vendsdk-base-network-eth-usdc-balance-lookup-19ae1e90
```

Example prompt: What are the current ETH and USDC balances for wallet address 0x1234abcd...5678 on Base mainnet?

## When to prefer this

Use this endpoint when you need live ETH and USDC balances specifically on the Base (Coinbase L2) mainnet in a single call. Prefer it over generic blockchain explorers when you need both ETH and USDC in one fast, agent-friendly response without API key setup. Ideal for pre-flight checks before payments, treasury monitoring, and verifying agent wallet funding on Base.

## Known failure modes

- Invalid or malformed 0x address returns an error response
- Address with zero balance returns eth: '0' and usdc: '0' with ok: true
- Network or RPC downtime may cause transient failures
- Non-Base-network addresses return data for the Base equivalent address (no cross-chain resolution)

## 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 a boolean 'ok' field, 'eth' balance as a string, 'usdc' balance as a string, 'chain' identifier (Base mainnet), and 'service' and 'source' metadata fields. Balances reflect live on-chain state at query time.

## 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/vendsdk-base-network-eth-usdc-balance-lookup-19ae1e90/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from vendsdk.com](https://www.zero.xyz/host/vendsdk.com/llms.txt)