I think you are asking "How can I set up a cryptocurrency exchange?" It depends on what legal jurisdiction you want to operate in. You will need expensive lawy

I think you are asking "How can I set up a cryptocurrency exchange?" It depends on what legal jurisdiction you want to operate in. You will need expensive lawyers to explain the local laws. It takes great effort to not get defrauded, hacked, sued, arrested, made bankrupt and sent to prison for years. You have to follow money laundering laws, money transfer laws and securities laws. If you let people deposit money by bank transfer then fraudsters will constantly do things like get gullible people to send a deposit to buy a second-hand car to the exchange bank account, turn the money into cryptocurrency and move it before the banks get a request to return the money. A typical business bank account will soon get closed by the bank. The man who ran FTX spent $11.5 million to buy part of a small bank. Exchanges are constantly targeted by fraudsters and criminal hackers. One screwup can result in a large theft. If you don't follow money laundering laws you can end up in prison like Charlie Shrem, the founder of bitinstant.