Spot Account Query spot account and sub-account balance, valuation, transaction history, and inter-account transfers. Authentication : all endpoints require an API key (read permission is enough; transfers need trade permission) Risk : read endpoints have no side effects; transfer endpoints require manual confirmation When to use - Query account list / single-account balance / total asset valuation - Look up balances across different currencies inside the spot account - Transfer funds between spot and USDT-M / COIN-M perpetual futures - Query sub-account balance, transfer between sub-accounts…