Crypto Onramp & NFT Gateway

I need a straightforward system that lets my users purchase cryptocurrencies directly, then move seamlessly into buying or minting NFTs. The on-ramp must handle the fiat-to-crypto conversion end-to-end, presenting a clean checkout flow that can be embedded in a web or mobile front end.

Once the coins are in a user’s wallet, the same flow should allow them to complete NFT transactions that will show up without issues on the major marketplaces I rely on:

• OpenSea
• Rarible
• SuperRare

Provide the full stack—API, smart-contract layer, and a lightweight dashboard—so I can monitor transactions and reconcile payments. Please keep the codebase clean, well documented, and ready for easy hand-off or future scaling.