GET /v1/fiat-currencies when building amount inputs and order from/to legs.
List fiat currencies
pk_* or sk_*.
Institutions
Banks are scoped to a fiat code:code as institution_code on offramp recipient and as bank_code on account lookup. See Offramp quickstart.
Account lookup
code from /v1/institutions.
Supported assets
Crypto side of onramp and offramp pairs.
Onramp quickstart
Fiat pay-in to crypto settlement.