Just saw that you need to pay some of your sellers in crypto and if that's the case, you may want to consider crypto.com. I normally wouldn't recommend them b/c they charge ridiculous fees to send bitcoin. But they do accept fiat payments through Apple/Google Pay. This means that you can pay with a credit card. And if you can pay with a credit card, you can pay off the card from your Mercury account without Mercury having any association with a crypto exchange. I'm certain that limits and restrictions will apply but with a little gymnastics and a lot of fees, this may help you accomplish your goal of sending crypto payments using funds from your Mercury account.