You have literally just mentioned one same exchange and its direct resellers and here is why mentioning them is a worst example ever:

1. ChangeNow and Changelly are operated by the same actors that have a huge track record of selective scamming.

2. ChangeHero and StealthEX are ChangeNow's API resellers.

3. None of them has a money transmitter license nor any regulatory approval.

Since you don't even have a company registered and operate anonymously, there is no reason for you to even try being compliant. Not even mentioning that asking KYC from your customers while not being a registered entity is unlawful.

Meanwhile, in a process of writing of this message, I decided to check what service you resell (since it's extremely easy given you operate with Ethereum) and created an order on your service. After the order completion, I have received coins from Gate.io in this transaction ID: https://etherscan.io/tx/0x089a801a71a8e9350eda4f92617d47d4629d29bf7cc2747e7d0b0cf55b2b5619



You should actually update your service description and ToS to mention the fact you don't represent your own liquidity and instead resell a third-party exchange Gate.io and rely on their AML/KYC policies to avoid misleading people.