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BaseLens ERC-20 Balance Lookup
x402
BaseLens ERC-20 Balance Lookup is a paid API for AI agents from baselens-api.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Returns the ERC-20 token balance for a given wallet address on the Base blockchain, including symbol, decimals, and raw balance.
Price / call$0.002
Success—
StatusUnknown
How this service works
Base address, ERC-20 balance, token price, recent transfers, Basename/ENS resolve, contract verification, tx summaries and gas over x402 and MCP. $0.001–$0.004 USDC per call, no API key.
Output
Returns a JSON object containing the token contract address, token symbol (e.g. USDC), human-readable balance, decimal precision, and raw balance integer — sufficient to display or compare holdings without further transformation.
Example use cases
DeFi portfolio balance check
“Can you look up how much USDC the Base address 0x1234567890abcdef1234567890abcdef12345678 is holding? The USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.”
Payment eligibility verification
“Before I process this transaction, check if 0xDeAdBeEf0000000000000000000000000000dEaD has at least some WETH on Base — the WETH contract is 0x4200000000000000000000000000000000000006.”
Agent treasury monitoring
“Tell me the current token balance of our agent's wallet 0xAaBbCcDdEeFf001122334455667788990011aabb for the DAI contract 0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb on Base.”
Technical details
Endpoint
GEThttps://baselens-api.vercel.app/v1/erc20-balance?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need on-chain ERC-20 token balances on the Base network without setting up an API key, especially in agent workflows that support x402 micropayments. It is ideal for pay-per-query agent pipelines, DeFi automations, or balance verification steps where the $0.002 per-call cost is acceptable and real-time on-chain accuracy is required.
Side effects
- Invalid or non-checksummed wallet address returns an error
- Token contract address that is not a valid ERC-20 on Base returns empty or error
- Address with zero balance returns balance of '0'
- Network downtime or RPC issues may produce 5xx errors
- Payment failure via x402 protocol causes 402 response blocking the call
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"token": "0x8335…2913",
"symbol": "USDC",
"balance": "1",
"decimals": 6,
"balanceRaw": "1000000"
}
}Tags
x402
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