# QuickBuild Base Wallet Balance Lookup

> QuickBuild Base Wallet Balance Lookup is a paid API for AI agents from quickbuild.quynguyenbac.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-21).

Returns ETH balance, ERC-20 token balances, USD values, nonce, and account type for any address on the Base blockchain

## Facts

- Endpoint: GET https://quickbuild.quynguyenbac.workers.dev/api/base/wallet?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quickbuild-base-wallet-balance-lookup-56bea749
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_edGWoLC_Ok6KYPoD_FkVG

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 quickbuild-base-wallet-balance-lookup-56bea749
```

Example prompt: What's the current ETH and token balance (including USD totals) for the Base address 0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf? Also include any USDC and WETH holdings.

## When to prefer this

Use this endpoint when you need a complete wallet snapshot on the Base network (L2), including both native ETH and multiple ERC-20 token balances with real-time USD pricing, in a single call. Prefer this over Ethereum mainnet balance APIs when the target address is on Base (chainId 8453). Ideal for portfolio dashboards, wallet monitoring, or verifying token holdings before executing a transaction.

## Known failure modes

- Invalid or malformed address returns an error — address must be 0x followed by 40 hex characters
- More than 10 custom ERC-20 contract addresses in `tokens` parameter causes rejection
- Unknown or non-existent ERC-20 contract address may return null symbol/balance fields
- RPC or network unavailability may cause timeout or 5xx error
- Payment not included or insufficient USDC (< $0.002) results in 402 Payment Required

## How this service works

Landing pages ($15), Google Sheets/Apps Script automation ($10), scrapers, scripts & Telegram bots (from $15), broken-link + sitemap audit reports ($10). See a working demo first, pay after.

## Output

A JSON object containing: the queried address, ETH balance in wei and formatted, ETH price in USD, an array of ERC-20 token objects (address, symbol, raw balance, formatted balance, decimals, USD value), total portfolio USD value, account nonce, account type (eoa, eoa-eip7702, or contract), and the block number at time of query.

## 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",
     "required": [],
     "properties": {
      "tokens": {
       "type": "string",
       "description": "Optional comma-separated extra ERC-20 contract addresses on Base (max 10)."
      },
      "address": {
       "type": "string",
       "description": "Base address (0x + 40 hex). Optional: defaults to 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 (vitalik.eth)."
      },
      "includeZero": {
       "type": "boolean",
       "description": "Also list well-known tokens with zero balance (default false)."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "eth": {
       "type": "object",
       "properties": {
        "usd": {
         "type": [
          "number",
          "null"
         ]
        },
        "wei": {
         "type": "string"
        },
        "balance": {
         "type": "string"
        }
       }
      },
      "nonce": {
       "type": "integer"
      },
      "tokens": {
       "type": "array",
       "items": {
        "type": "object",
        "properties": {
         "raw": {
          "type": "string"
         },
         "usd": {
          "type": [
           "number",
           "null"
          ]
         },
         "symbol": {
          "type": [
           "string",
           "null"
          ]
         },
         "address": {
          "type": "string"
         },
         "balance": {
          "type": [
           "string",
           "null"
          ]
         },
         "decimals": {
          "type": [
           "integer",
           "null"
          ]
         }
        }
       }
      },
      "address": {
       "type": "string"
      },
      "totalUsd": {
       "type": "number"
      },
      "isContract": {
       "type": "boolean"
      },
      "accountType": {
       "enum": [
        "eoa",
        "eoa-eip7702",
        "contract"
       ],
       "type": "string"
      },
 
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "eth": {
   "usd": 0,
   "wei": "0",
   "balance": "0"
  },
  "nonce": 0,
  "tokens": [
   {
    "raw": "50000",
    "usd": 0.05,
    "symbol": "USDC",
    "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "balance": "0.05",
    "decimals": 6
   }
  ],
  "address": "0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf",
  "chainId": 8453,
  "totalUsd": 0.05,
  "isContract": false,
  "accountType": "eoa",
  "blockNumber": 52868213
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quickbuild-base-wallet-balance-lookup-56bea749/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from quickbuild.quynguyenbac.workers.dev](https://www.zero.xyz/host/quickbuild.quynguyenbac.workers.dev/llms.txt)