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ERC-20 Token Balance Lookup (On-Chain)
x402
ERC-20 Token Balance Lookup (On-Chain) is a paid API for AI agents from rockndefi.xyz:8443, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).
Returns the ERC-20 token balance for a given wallet address on Base or Ethereum, including raw amount, formatted balance, symbol, and decimals.
Price / call$0.002
Success—
StatusUnknown
How this service works
Pay-per-call website uptime/latency/TLS checks and fetch-to-Markdown, measured from US Central (St. Louis). USDC on Base via x402. No account or API key.
Output
Returns a JSON object with four fields: 'balance' (human-readable formatted amount, e.g. '12.5'), 'raw' (unformatted big integer string, e.g. '12500000'), 'symbol' (token ticker, e.g. 'USDC'), and 'decimals' (integer precision, e.g. 6). Payment is $0.002 USDC per call via x402 on Base, no account required.
Example use cases
Verify wallet funding before a DeFi action
“Before we execute the swap, check whether 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 has enough USDC on Base — the contract address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Portfolio token balance snapshot
“Pull the current USDC balance on Ethereum for wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B using the USDC contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 so I can update our portfolio tracker.”
Airdrop eligibility check
“Check whether the address 0x1234567890abcdef1234567890abcdef12345678 holds any of the token at contract 0xTokenContractAddressHere on Base — I need the exact balance before deciding if they qualify for the airdrop.”
Technical details
Endpoint
GEThttps://rockndefi.xyz:8443/v1/chain/erc20-balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, no-account ERC-20 balance check on Base or Ethereum and want to pay per-call with USDC via x402 rather than provisioning an API key or running your own node. It is ideal for agents or scripts that need occasional on-chain balance queries without a persistent service subscription.
Side effects
- Invalid or non-checksummed EVM address returns an error or empty result
- Non-existent ERC-20 contract address may return zero balance or an error
- Unsupported chain value (only 'base' and 'ethereum' are accepted)
- Network latency or RPC node unavailability may cause timeouts
- Payment failure via x402 prevents the call from being processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"raw": "12500000",
"symbol": "USDC",
"balance": "12.5",
"decimals": 6
}
}Tags
x402
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