What are some alternatives?
When comparing Kraken and Stripe, you can also consider the following products
Coinbase - Bitcoin, safe and easy.
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
Bitfinex - Bitfinex is the largest and most advanced crypto-currencies trading platform.
Chargebee - Chargebee lets you manage subscriptions and payments at scale, handle custom recurring billing scenarios, reduce subscription churn and simplify accounting.
Binance - Cryptocurrencies exchange platform
Recurly - Subscription billing and recurring billing management. Recurly offers enterprise-class subscription billing for thousands of companies worldwide.