Balance Lookup
Returns ETH and USDC balances for any address on Base mainnet.
Endpoint
code
GET https://pinionos.com/skill/balance/:address
Price: $0.01 USDC per call (x402 on Base)
Parameters
| Parameter | Type | Required | Description |
|---|---|---|---|
| address | string | yes | Ethereum address (0x, 40 hex chars) |
Example Request
bash
curl https://pinionos.com/skill/balance/0x101Cd32b9bEEE93845Ead7Bc604a5F1873330acf
The first request returns HTTP 402 with payment requirements. Sign a USDC TransferWithAuthorization (EIP-3009) and retry with the X-PAYMENT header.
Example Response
json
{
"address": "0x101Cd32b9bEEE93845Ead7Bc604a5F1873330acf",
"network": "base",
"balances": {
"ETH": "0.042100",
"USDC": "12.50"
},
"timestamp": "2026-02-16T12:00:00.000Z"
}
When to Use
- •Check any wallet's ETH and USDC holdings on Base before sending or trading.
- •Verify an agent's funding level.
- •Confirm a payment was received.