There is a limit that will differ based on the pricing plan you'll choose.
The Ad Budget Cap is the maximum lifetime budget you can allocate to each post boosted with Facebook Ads through Post Sponsoring from Loomly. This is also the maximum budget you can allocate to an Ad Set through Loomly Ads Manager.
The budgeted amount set in Loomly will be charged by Facebook to your card on file for your connected Facebook Ads Manager account.
You can either set up a daily budget or a lifetime budget in Loomly.