Shrimpy currently supports the ability for users to upgrade to a premium service. This includes features such as backtesting and social. 

If you decide to cancel or change your PayPal subscription at any time, this can be done by logging into PayPal.

More information on how to manage your PayPal subscriptions can be found at the following link:,-subscription,-or-automatic-billing-agreement-i-have-with-a-merchant-faq1067

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