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Base Wallet Token Balances
x402
Base Wallet Token Balances is a paid API for AI agents from api.botx402.io, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Returns live ETH and ERC-20 token balances (top 200 Base tokens + custom addresses) for a given Base mainnet wallet address
Price / call$0.01
Success—
StatusUnknown
How this service works
Returns the native ETH balance and ERC-20 token balances of one Base wallet address, read live from Base mainnet at the latest block: USDC, WETH and the rest of the top 200 Base tokens by market cap, plus up to 50 token contract addresses named in the request. Each row carries the token symbol, name, decimals, raw amount and human-readable amount. Suited to checking a wallet's current holdings before a payment, transfer or swap; returns no labels, identities, USD values or portfolio valuation.
Output
A list of token balance rows for the queried Base wallet, ordered with native ETH first and then top Base tokens by rank. Each row includes the token symbol, name, decimal places, raw on-chain amount, and human-readable amount. Data is read live from Base mainnet at the latest block. No USD values, portfolio valuation, or identity labels are included.
Example use cases
Pre-payment balance check
“Before I send 500 USDC to someone on Base, can you check whether my wallet 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045 actually has enough USDC on Base mainnet right now?”
Pre-swap holdings verification
“I want to swap some WETH for USDC on Base — can you pull the live ETH and WETH balances for wallet 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B so I know what I'm working with?”
Custom token balance lookup
“Can you check the balance of the custom token at contract address 0x4200000000000000000000000000000000000006 in my Base wallet 0x1234567890abcdef1234567890abcdef12345678, along with any other top Base tokens I might be holding?”
Technical details
Endpoint
POSThttps://api.botx402.io/base-address-balance?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need real-time, on-chain token balances for a Base mainnet wallet address — especially before executing a payment, transfer, or token swap where accurate balance verification is critical. It covers native ETH plus the top 200 Base tokens by market cap automatically, and accepts up to 50 additional custom contract addresses. Prefer this over portfolio or analytics APIs when you need raw and human-readable amounts without USD pricing, identity labels, or historical data.
Side effects
- Invalid wallet address format (not 0x + 40 hex chars) returns 400
- Chain value other than 'base' returns 400
- Non-empty filters or order_by objects return 400
- More than 50 custom token_addresses provided returns 400
- Network or RPC timeout when reading from Base mainnet
- Token contract address that is not a valid ERC-20 may return zero balance without error
- Wallet with no token holdings returns empty rows except native ETH
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | The chain to read. Only "base" is served; any other value returns 400. |
| address | string | The Base wallet address (0x and 40 hex characters) whose token balances are read. |
| filters | object | Accepted only when empty. |
| order_by | array | Accepted only when empty. Rows come native token first, then by the token list's rank. |
| pagination | object | |
| hide_spam_token | boolean | Accepted for compatibility. Holdings come from a fixed list of tokens, so there is no spam to hide. |
| token_addresses | array | ERC-20 token contract addresses to read beyond the fixed list of the top 200 Base tokens. |
Tags
x402
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