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Arbitrum One Wallet Balance Checker
x402
Arbitrum One Wallet Balance Checker is a paid API for AI agents from onchaincheck.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-29).
Returns the native ETH balance and up to 20 ERC-20 token balances for a given Arbitrum One wallet address, with symbols and decimal-adjusted amounts.
Price / call$0.005
Success—
StatusUnknown
How this service works
Native ETH balance of a Arbitrum One wallet plus the balances of up to 20 ERC-20 tokens you list, formatted with each token's symbol and decimals, read live from Arbitrum One.
Output
A JSON object with the queried wallet address, the native ETH balance as a human-readable decimal string, and an array of token objects each containing the contract address, symbol, decimals, raw balance integer, and decimal-adjusted balance string — all read live from Arbitrum One.
Example use cases
DeFi portfolio snapshot for a trader
“Check the live Arbitrum One balances for wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 — I want to see its ETH plus its USDC (0xaf88d065e77c8cC2239327C5EDb3A432268e5831), ARB (0x912CE59144191C1204E64559FE8253a0e49E6548), and WETH (0x82aF49447D8a07e3bd95BD0d56f35241523fBab1) balances right now.”
Bot pre-trade balance verification
“Before I execute a swap, confirm that wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B has enough USDC (0xaf88d065e77c8cC2239327C5EDb3A432268e5831) on Arbitrum One to cover the trade — fetch its current balances.”
Airdrop eligibility balance check
“I need to verify whether address 0x1234567890abcdef1234567890abcdef12345678 holds any ARB tokens (0x912CE59144191C1204E64559FE8253a0e49E6548) on Arbitrum One right now — can you pull its live on-chain balance?”
Technical details
Endpoint
GEThttps://onchaincheck.dev/arbitrum/balances?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need live, on-chain ETH and multi-token balances for a single Arbitrum One address in one call, especially when you need decimal-formatted amounts with correct symbols. It is ideal for portfolio checks, pre-trade balance verification, and airdrop eligibility checks on Arbitrum One specifically — not for Ethereum mainnet, Base, Optimism, or other chains.
Side effects
- Invalid wallet address format (not a valid 0x hex address) returns an error
- Invalid ERC-20 contract address in the tokens list causes a query failure
- Token contract address that is not a valid ERC-20 may return zero or error
- Rate limiting or RPC node unavailability may cause transient failures
- More than 20 token addresses in the tokens parameter is rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "arbitrum",
"tokens": [
{
"raw": "158162265",
"token": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"symbol": "USDC",
"balance": "158.162265",
"decimals": 6
},
{
"raw": "23671066717268252605",
"token": "0x912CE59144191C1204E64559FE8253a0e49E6548",
"symbol": "ARB",
"balance": "23.671066717268252605",
"decimals": 18
}
],
"address": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"nativeSymbol": "ETH",
"nativeBalance": "0.159411760906900921"
}
}Tags
x402
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