There is currently no limit, you can connect as many as you want.However, from January 1, 2023, the standard plan can only connect to 1 exchange, and the advanced plan and professional plan can still connect unlimited exchange accounts.
When you can connect an unlimited number of exchange accounts, it means you can connect unlimitedly:
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Trading accounts of different exchanges
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Different main accounts and sub-accounts of the same exchange, but different API keys of the same account cannot be connected twice