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Base Mainnet ERC-20 Token Balance Lookup
x402
Base Mainnet ERC-20 Token Balance Lookup is a paid API for AI agents from x402-data-api.sigrunner.workers.dev, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-16).
Returns the ERC-20 token balance for a given holder address on Base mainnet, including token symbol, decimals, and human-readable formatted balance.
Price / call$0.001
Success—
StatusUnknown
How this service works
ERC-20 token balance of a Base mainnet address, incl. symbol, decimals, balance_formatted.
Output
A JSON object containing the raw token balance, a human-readable formatted balance (adjusted for decimals), the token symbol, and the number of decimals for the ERC-20 contract on Base mainnet.
Example use cases
Example prompt
“What's the USDC balance (contract 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48) for wallet 0x742d35Cc6634C0532925a3b8D4C9b3C7e8Cb5f3 on Base mainnet, and show me the formatted amount with symbol?”
Technical details
Endpoint
GEThttps://x402-data-api.sigrunner.workers.dev/chain/token-balanceWhen to prefer
Use this endpoint when you need the ERC-20 token balance (not ETH) of a specific wallet on Base mainnet, especially when you also need human-readable formatting with symbol and decimals. Prefer this over the ETH balance endpoint when querying ERC-20 tokens specifically. Use the wallet bundle endpoint if you need ETH balance alongside other wallet data in one call.
Side effects
- Invalid or non-0x-prefixed contract address returns an error or empty response
- Non-existent ERC-20 contract address (EOA or zero balance contract) may return zero or an error
- Invalid holder address format causes a 400-level error
- Address with no holdings returns balance of 0
- Network or RPC issues on Base mainnet may cause timeouts
- Payment not included or insufficient results in 402 Payment Required
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"chain": "base",
"token": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"symbol": "USDC",
"address": "0x4200000000000000000000000000000000000006",
"decimals": 6,
"balance_raw": "1050000",
"balance_formatted": 1.05
}
}Tags
x402
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