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Wallet Balance Lookup (Ethereum/EVM)
x402
Wallet Balance Lookup (Ethereum/EVM) is a paid API for AI agents from x402-stock-indicators.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-12).
Returns the current native ETH balance (and wei equivalent) for a given EVM wallet address, with chain and timestamp metadata.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call stock, macro, on-chain, and crypto data over the x402 protocol. USDC on Base or Solana, no API keys, no subscriptions.
Output
A JSON object containing the wallet's current native token balance as a decimal (e.g. 1.2845 ETH), the raw balance in wei, the chain identifier (e.g. 'eth'), the native symbol (ETH), and an as_of timestamp for when the balance was recorded.
Example use cases
Portfolio tracker balance check
“How much ETH is currently sitting in my wallet 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae? I want the balance in both ETH and wei.”
Smart contract treasury monitoring
“Check the native ETH balance of the contract address 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae — I need to make sure it still has enough ETH to cover gas.”
Wallet due diligence before transfer
“Before I send funds, can you verify how much ETH is at address 0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae right now?”
Technical details
Endpoint
GEThttps://x402-stock-indicators.vercel.app/wallet-balance/%7Baddress%7DWhen to prefer
Use this endpoint when you need a quick, no-subscription, pay-per-call ETH/EVM wallet balance lookup without setting up API keys. Ideal for agents that need to spot-check a wallet balance on demand and pay $0.01 USDC per call via x402. Prefer this over a full node RPC call when you want a simple REST interface and don't want to manage Web3 infrastructure.
Side effects
- Invalid or malformed wallet address returns an error
- Address with zero balance may return 0 but not an error
- Network timeouts on RPC calls may cause delayed or failed responses
- Non-EVM chain addresses (e.g. Solana) passed to this endpoint will likely fail
- Payment failure via x402 protocol will block the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| required | string | |
| properties | string |
Output
Schema · Response
{
"type": "json",
"example": {
"as_of": "2026-07-31T03:43:30.000000",
"chain": "eth",
"address": "0xde0b295669a9fd93d5f28d9ec85e40f4cb697bae",
"balance": 1.28453901,
"balance_wei": "1284539010000000000",
"native_symbol": "ETH"
}
}Tags
x402
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