I'm not 100% sure about API pricing, but I would imagine they are free to make for businesses that actually ship things. It seems like one of those things you shouldn't skimp on as a carrier.
And yes they should at least offer a no-signup in-cart shipping estimate. Most off the shelf eccommerce sites do. If not, they definitely want to spam your inbox with "come back, we miss you!" messages :)
On the plus side, if you do care about the purchase enough to give them an Email at that point you can probably abandon the cart and get a discount. :)
And yes they should at least offer a no-signup in-cart shipping estimate. Most off the shelf eccommerce sites do. If not, they definitely want to spam your inbox with "come back, we miss you!" messages :)