MakeTheDonation and Toast.
Honest answer: we have not built a Toast integration yet. Here is where that stands.
Where things stand
Toast offers its own built-in round-up program, and if you run on Toast today it is worth a look.
When we build Toast support, it will work the way MakeTheDonation always works: you choose any participating nonprofit, donations go directly from you to them with no funds routed through anyone in between, nonprofits never pay a fee, and you get one statement a month.
Run a restaurant on Toast and want that here? Tell us. Interest from real restaurants is what moves an integration up our roadmap.