I've been using Transferwise, which is now known as Wise to pay people outside of the US for years. For inside the US I'm using Quickbooks. Other then liking their original name better I can't really say anything bad about Wise.
While not as quick as a crypto transfer, wise is remarkably fast when comparing it to the US banking system at least. The person you're paying does need a wise account and their banking details entered in it, but beyond that the funds are ACH'd out of my account and converted to their own local currency and deposited directly into their bank accounts.
It does look like they have an api [1] too though as I only have two people I'm paying with it I've always just entered it manually.