This is most likely a refundable security deposit associated with your recent rental. Omni charges a temporary security deposit in the event of any damage or loss of items you've rented. The deposit varies depending on the amount set by listing’s owner.
When checking out your listing, you’ll always see the security deposit amount listed under the price of your rental. Here’s an example:
Once your item has been returned Omni will release your security deposit and you should see these funds processed back into your account in 3 -10 business days, depending on how long your bank takes to process payments.