Coinbase Prime offers real-time portfolio and wallet balance information through its API. Note that the endpoints described here do not retain historical balance data. If a use case requires a history of balances over time, these endpoints should periodically queried with the results stored in an external system for long-term recordkeeping.

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Calculating Portfolio Balances

Use List Portfolio Balances to see aggregated balances for all assets within a specific portfolio. This is useful for high-level monitoring and trading workflows, such as displaying a portfolio overview or verifying available funds before placing orders. 
BalancesService balancesService = PrimeServiceFactory.createBalancesService(client);

ListPortfolioBalancesRequest request = new ListPortfolioBalancesRequest.Builder("PORTFOLIO_ID_HERE").build();

ListPortfolioBalancesResponse response = balancesService.listPortfolioBalances(request);
To learn more about this SDK, please visit the Prime Java SDK.

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Calculating Wallet Balances

Individual wallet balances can be obtained with Get Wallet Balance. This endpoint returns the current balance for a single wallet, making it ideal for tracking balances at the wallet level — for instance, monitoring a specific vault wallet in Coinbase Custody or a trading wallet in Prime. Please review the Wallets page before proceeding. 
BalancesService balancesService = PrimeServiceFactory.createBalancesService(client);

GetWalletBalanceRequest request = new GetWalletBalanceRequest.Builder()
    .portfolioId("PORTFOLIO_ID_HERE")
    .walletId("WALLET_ID_HERE")
    .build();

GetWalletBalanceResponse response = balancesService.getWalletBalance(request);
To learn more about this SDK, please visit the Prime Java SDK.
Please note: All requests discussed above require proper authentication. For more information, visit REST API Authentication.