Agreed, the GetRates API (and Rate Calculator in the UI) need to include SurePost rates.
They will never do it, this has been a reoccurring request for the better part of a decade. Way before this request was made in 2018.
Bump , Please add this feature!
You can use Shipping Plus app (www.shippingplus.co) for ShipStation to automatically have smart post selected when it’s the cheapest option
My best guess is that ShipStation is somehow partnered with that Shipping Plus app, therefore making us spend more money to use an additional product to do what should be native in the software.
This is not cool and not the way to keep customers happy.