Yes, and it depends on the coin and network. The screen shows it.
Each coin and network pair carries its own minimum, because network costs differ. The exact figure appears on the deposit screen for the bankroll you selected, before you send anything.
- Send less than the minimum and the transfer may not be credited.
- The minimum can change when network conditions change. Read it each time.
- There is no maximum deposit, but large transfers can trigger a routine review.
Sent something below the minimum? Tell support with the transaction hash.