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QuickBuild Base Wallet Balance Lookup
x402
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
Price / call$0.002
Success—
StatusUnknown
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.
Example use cases
Portfolio snapshot for a Base wallet
“Can you pull the full token portfolio for 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on Base, including ETH and all ERC-20 balances with their USD values?”
Verify smart contract vs EOA account type
“Tell me whether the Base address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 is a smart contract or a regular wallet, and show its ETH balance.”
Check custom token balance on Base
“Look up the balance of my Base wallet 0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf and also include the balance for this ERC-20 token at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 — show me the USD value too.”
Technical details
Endpoint
GEThttps://quickbuild.quynguyenbac.workers.dev/api/base/wallet?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"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
}
}Tags
x402
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