BTC and ETH Blockchain Transfers

[meeekz]

I am setting up a web application and want to take BTC and ETH.

What is the best way (speed and security) to allow contributors to initiate a transfer of BTC or ETH to a private wallet with a minimum transfer fee?

[notaek]

Since it is your web application, you can use Coinpayments. They have auto coin conversion feature and have plugins for various shopping carts.

[meeekz]

Since it is your web application, you can use Coinpayments. They have auto coin conversion feature and have plugins for various shopping carts.

Thanks. Is is possible to just have someone write a smart contract and avoid the .5% fee?

What are the pros and cons?