Build with Square VS Monzo

Depends on how your site is built (namecheap tells us nothing). There's API instructions for Square at https://developer.squareup.com/us/en. Source: over 1 year ago

While the API itself is lacking some of what I'd consider "core" functionality (especially their new Bookings API), the squareup api is actually really nice to work with. Their documentation experience / code playground is incredible. it's super empathetic to the developer experience and they clearly place a ton of value in that. also, echoing everyone else here that stripe and twilio have some bangin' apis and docs. Source: almost 3 years ago

Not entirely relevant to your question but monzo have US accounts, https://monzo.com/us/. Source: 10 months ago

In case you missed it, our Monzo US website also got a makeover! We still have big plans to make it easier to find resources you need to make managing your money easy. Be sure to watch this space. 👀. Source: 12 months ago

If you can't log in the help email is at the bottom of the US homepage https://monzo.com/us/. Source: about 1 year ago

I did some digging and found out that the most popular neobank, Monzo, in the UK came to the US and it seems incredibly promising! As a larger and more established Neobank, they are much less likely to sell out to big corporations (RIP Simple and One). They seem to have a lot of similar ideas One had and are even working on adding more, all based on live input from their users. The website is ... Source: over 1 year ago

So basically check out https://dasbudget.com/features and https://monzo.com/us/. Combine all those features and consider that Monzo has a public API that allows DAS Budget to get instant transaction updates from it. Source: over 1 year ago