Some questions come to mind after poking around the catalogue (having worked in an enterprise that ended up with many API catalogues, and now many APIs in startup land, I get the pain point).

- What's the difference between currency and forex? They look to be serving the same case, but in different ways, without reference to one another - challenging the implied claim to "this is the best way to X"

- payments. Stripe/... integration into any moderately saas business is a ball-ache. Current "subscription management" services are woefully, laughably inadequate . If you had a /pay endpoint, where I could offload payments, I would have been quite happy indeed - email. Needs better documentation. When sending an email through this interface, is there impersonation? Or is it "me@mine.com <someemailservice@someintermediary.foo.bar>"

Neat idea - the enterprise survivor in me wishes you success