"The number of API wallets available starts at 3 for all master accounts and increases by 2 per sub-account." So you can create up to 3 API wallets if you have under $100k in volume, 23 if you have over $100k, and you also get an additional 2 API wallets for every $100M in volume. https://hyperliquid.gitbook.io/hyperliquid-docs/trading/sub-accounts
"The number of API wallets available starts at 3 for all master accounts and increases by 2 per sub-account." So you can create up to 3 API wallets if you have under $100k in volume, 23 if you have over $100k, and you also get an additional 2 API wallets for every $100M in volume. https://hyperliquid.gitbook.io/hyperliquid-docs/trading/sub-accounts