Wouldn't this Cash.app be similar Strike? And doesn't Strike have fees? I'm interested in a fee free API.

This is the first time I've posted on /. so please excuse anything not kosher. I'd like to know more about this Bitcoin integration with the Cash.app. I currently use Stripe for a website business where I charge my customers and then payout customers. FYI - Stripe takes a fee from the total amount for both receiving and paying out. I take an additional fee for each payout. Question - It would be nice to integrate a service (Ex. Cash.app) that didn't take any fee except mine, where I can collect money/Bitcoin/etc from customers to payout other customers, but my concern is what happens when I charge a customer $10.00 worth of Cash.app funds or Bitcoins or whatever in the Cash.app and then after a period of time (ex. 1 month) I payout (send money/Bitcoins/Cash.app funds) from my account to payout another customer and in that 1 month period the price of Bitcoin has dropped 10%? Does the value I send decrease, is the amount of Bitcoin sent smaller? Does someone in this scenario (ex. me) get screwed on the amounts transfered, etc, etc, etc??