EasyPost, based in Lehi, Utah, is the API-first option in this niche: one integration reaching more than a hundred carriers, from USPS and UPS to regional couriers. Beyond label buying it sells address verification, tracking webhooks, parcel insurance and a rate shopping engine that picks the cheapest service per shipment. Pricing is modular rather than a flat subscription: a free access tier covers a few thousand labels a year on wallet carriers, while bringing your own carrier accounts costs a fixed monthly fee plus a charge per label.
The natural pick for a development team building shipping into its own admin panel or marketplace. It is the wrong tool for a store owner who just wants a screen with a print button, since almost everything assumes engineering time, and pricing terms have shifted more than once in recent years.
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