Hi Zach,
We have built a SaaS platform at Fintech Systems (https://fintechsystems.ltd) that does everything you want and more.
Buy, Swap, Trade, Custom Market Data API, Integrated Eth wallet, smart contracts, build your own token, create funding contracts, publish your smart token to the wallet, a full affiliate system etc etc. Borrow, Lend, Sell coming soon.
Save yourself the headache and come talk to me. You can find me in LinkedIn (https://www.linkedin.com/in/graemeconradie/), or inside my collaboration platform FinChat – https://chat.fintechsystems.ltd, create an account and ping me (Graeme).
Graeme