Security deposit for rental car is starting from AED 2000. About depends on type of car you rent. Deposit should be paid in the moment of receiving the car. It will be released in 30 days starting from returning date of the car. You can chose how to receive deposit back - by bank transfer, Western Union or crypto transfer to your wallet. If in the moment of paying deposit you used option to hold on your credit card, money will be realized automatically by your bank after 21 days.