You need a multi-carrier shipping API that holds up for US carriers while those carriers keep changing their own APIs. If your search began with Shippn API vs EasyPost API, Shippn’s own FAQ describes an international package-forwarding service that accepts no labels created outside its platform and offers no domestic shipping, so the comparison that fits is AfterShip Shipping against EasyPost. On documented uptime commitment, US parcel carrier coverage, developer tooling, and one developer porta
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