I'm not the right person to ask for detailed feedback from. I'd only be able to simulate the intended user. I'd reach out to many of the Bolt Fun entrants and see what the pain points of implementing their projects were. Maybe there's overlap.

It sounds interesting, like a wrapper around any lnurl compatible wallet (which is how I assume you'd pay to WOS and Bluewallet). I can see some developers being intimidated by lnurl.

Strike has low costs because they've raised 10's of millions of dollars in venture funding and are sacrificing profits for growth. This is a tradeoff consumer products often make.

You aren't building a consumer app - you are building a b2b app. Stripe wasn't free when it started. I recommend you think more about this.

IIRC Tim didn't only start charging until recently, and launched the service nearly 3 years ago.