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On-Chain ETH Balance Lookup
x402
On-Chain ETH Balance Lookup is a paid API for AI agents from store.agentexchange.work, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Returns the native ETH balance, transaction count, and USD value for a given wallet address on EVM-compatible chains
Price / call$0.001
Success—
StatusUnknown
How this service works
The cheapest on-chain RPC read: any address's native coin balance (ETH/POL/xDAI) with live USD value and outgoing transaction count (nonce), across Base, Ethereum, Optimism, Arbitrum, Polygon, Gnosis. The high-frequency balance check wallet-tracking, settlement, and trading agents poll constantly. Free upstream (Blockscout); undercuts onesource.
Output
A JSON object containing the chain name, native token symbol (e.g. ETH), the queried wallet address, the raw token balance as a number, total transaction count, and current USD equivalent value of the holdings.
Example use cases
Example prompt
“What's the ETH balance and current USD value of the wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 on the Base network?”
Technical details
Endpoint
GEThttps://store.agentexchange.work/chain/balanceWhen to prefer
Choose this endpoint when you need a lightweight, key-free, pay-per-call lookup of native ETH (or EVM-chain) balance and USD value for any wallet address. Ideal for AI agents that need on-chain reads without managing API keys or subscriptions, especially on Base, Ethereum, Optimism, Arbitrum, Polygon, or Gnosis.
Side effects
- Missing or malformed address (non-0x format) returns 400 error
- Unsupported chain identifier returns an error or defaults to base
- Address with no activity may return zero balances
- Payment not received (402 Payment Required) if x402 USDC payment is not included
- RPC node timeout or chain congestion may cause delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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