At the moment we do not have a specific API level integration with SendReach.
If their system is capable of generating a HTML web form (like you would use to place on other pages or blog sidebars) then you most likely can integrate it with your OptimizePress pages using our “Custom form” integration method
You can find out more about that here:
https://optimizepress.zendesk.com/hc/en-us/articles/200557438-Custom-Form-Integration-works-for-most…