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AUN Base Balance Checker
x402
AUN Base Balance Checker is a paid API for AI agents from a-upgradenet.com, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-23).
Fetches ETH and ERC-20 token balances for a given 0x address on the Base blockchain
Price / call$0.001
Success—
StatusUnknown
How this service works
Base Wallet Balance: ETH and ERC-20 balances (USDC by default, up to 10 tokens) of any address on Base mainnet. $0.001 per call.
Output
Returns a JSON object containing the wallet's ETH balance (in both ETH and wei), the block number at query time, the chain identifier ('base'), a status field, and an array of token objects each with address, symbol, decimals, raw balance, and human-readable balance.
Example use cases
DeFi portfolio balance snapshot
“Can you check how much USDC and ETH I have sitting in my Base wallet 0xAbCd1234…5678?”
Verify payment received on Base
“Did my Base address 0xDEAD…BEEF receive the USDC payment yet? Check the current token balance for me.”
Multi-token holdings audit
“Look up all ERC-20 token balances for 0x9999…AAAA on Base — I want to see USDC plus any other tokens I might be holding.”
Technical details
Endpoint
POSThttps://a-upgradenet.com/x402/base-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a fast, on-chain balance lookup specifically for addresses on the Base L2 network, particularly for USDC or other ERC-20 tokens. Prefer this over generic blockchain explorers when you need structured JSON output ready for downstream agent logic, and when you want to check up to 10 tokens in a single call without managing your own RPC node.
Side effects
- Invalid or malformed 0x address returns an error response
- Non-existent ERC-20 contract address may return zero balance or error
- Exceeding the 10-token limit in the tokens array causes a validation error
- Network congestion on Base may cause timeouts
- Payment failure (x402 protocol) prevents the call from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| tokens | array | ERC-20 contract addresses. Defaults to Base USDC. |
| address | string | 0x address on Base. |
Output
Schema · Response
{
"type": "json",
"example": {
"eth": "0.0123",
"chain": "base",
"status": "completed",
"tokens": [
{
"raw": "25500000",
"symbol": "USDC",
"address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"balance": "25.5",
"decimals": 6
}
],
"address": "0x…",
"eth_wei": "12300000000000000",
"block_number": "21000000"
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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