i need:
1) Interface for user to convert:
- Bitcoin to fiat
- Fiate to Bitcoin
2) Customize the Real Conversion rate to clients commissioned rate
3) BitCoin Payment Gateway Integration and Transactions
4) Fiat Payment Gateway Integration and Transactions
5) Admin Interface
-- Manage Commission % on exchange
-- User Management
-- Transaction Management
i think best api to cal is : [login to view URL]
I'm willing to give this a try. However your going to have trouble with Fiat currency. Everyone does. There's no good way to get money in and out. That's why all the exchanges have issues.