What are some alternatives?
When comparing Kraken and Ameto.de, you can also consider the following products
Coinbase - Bitcoin, safe and easy.
Binance - Cryptocurrencies exchange platform
Bitfinex - Bitfinex is the largest and most advanced crypto-currencies trading platform.
LocalBitcoins.com - LocalBitcoins.com is a person-to-person bitcoin trading site.
Gravity Forms - Gravity Forms is one of the best and easiest contact form plugins to create modern forms for websites powered by widely-used WordPress.
Uphold - Move, convert, transact and hold any form of money or commodity. Instantly, securely and for free.