Your deposit status might be "pending" for various reasons: the bitcoin transaction fee is too low, or the transaction value is too big, and you need to wait for enough confirmations from the Bitcoin network. If your bitcoin transaction goes on pending:

  1. The payment is either insufficient or unavailable -

You must add a charge to the network for completing your desired transaction as the sender of the transaction.

Once a transaction is placed on the blockchain, it will take a certain amount of time to be verified and uploaded to the target exchange. To validate a transaction, various exchanges demand different numbers of "confirmations."