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ERC-20 Token Balance Lookup
x402
ERC-20 Token Balance Lookup is a paid API for AI agents from anibalb.duckdns.org, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-31).
Returns the ERC-20 token balance for a given wallet address on a specified contract, including symbol, decimals, and balance.
Price / call$0.003
Success—
StatusUnknown
How this service works
Public data and utility APIs paid per call in USDC on Base (x402). No accounts, no API keys. 174 routes: crypto/equity data, onchain reads, DNS/email/security intel, geo/weather, x402 payment diagnostics, dev utilities and more.
Output
Returns a JSON object with the token symbol (e.g. 'USDC'), the wallet address queried, the token balance as a number, the ERC-20 contract address, and the number of decimals used by the token.
Example use cases
Pre-transfer token balance check
“Before I send tokens, check the ERC-20 balance of wallet 0xAbC123... on the DAI contract 0x6B175474E89094C44Da98b954EedeAC495271d0F so I know if it has enough funds.”
DeFi portfolio balance audit
“Look up the USDC balance for my wallet 0xDeF456... using the USDC contract address 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Base — I want to see the raw balance and how many decimals it uses.”
Smart contract token eligibility check
“Can you check if wallet 0x789GHI... holds any tokens in the governance token contract 0x1f9840a85d5aF5bf1D1762F925BDADdC4201F984? I need the balance and symbol to verify eligibility.”
Technical details
Endpoint
GEThttps://anibalb.duckdns.org/x402/erc20-balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a fast, keyless, pay-per-call onchain ERC-20 balance read without setting up an account or API key. Ideal for agents that need to check token holdings programmatically on demand, especially when working in a x402 micropayment context. Prefer this over full node queries when you want a simple REST interface to ERC-20 balances without managing RPC infrastructure.
Side effects
- Invalid or malformed wallet address returns an error
- Unknown or non-ERC-20 contract address may return zero balance or an error
- Missing required 'address' query parameter returns a validation error
- Network or RPC errors from the underlying blockchain node
- Contract address with no deployed code returns an error
- Rate limiting or payment failure via x402 if USDC payment is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"symbol": "USDC",
"address": "0x...",
"balance": 100,
"contract": "0x...",
"decimals": 6
}
}Tags
x402
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