EasyPost is a shipping API platform built specifically for developers who need to programmatically generate shipping labels, compare carrier rates, track packages, verify addresses, and manage returns, all through a single, unified RESTful API. While ShipStation is a shipping management UI for merchants, EasyPost is the API-first equivalent built for engineers embedding shipping logic directly into custom applications. It supports over 100 carriers including USPS, UPS, FedEx, DHL, and dozens of regional carriers, normalizing all of their different rate structures, label formats, and tracking systems into a consistent API interface. For custom web application development, EasyPost is the go-to when building applications that need programmatic shipping capabilities: custom e-commerce platforms, warehouse management systems, logistics tools, subscription box services, or any application where shipping label generation and rate comparison need to happen automatically without a human using a web dashboard.
The Backstory
EasyPost was founded in 2012 by Jarrett Streebin, who was a Y Combinator alum and had experienced the pain of integrating with shipping carriers firsthand. Every major carrier, USPS, UPS, FedEx, had its own API with its own authentication scheme, data format, label specification, and quirks. Building a multi-carrier shipping integration from scratch could take a development team months. Streebin's insight was the same one that made Stripe successful in payments and Plaid successful in banking: abstract away the complexity of connecting to dozens of different legacy systems behind a single, clean developer API. EasyPost went through Y Combinator and gained early traction with e-commerce startups and logistics companies that needed to ship at scale but didn't want to maintain individual carrier integrations. The company has grown to process hundreds of millions of shipments per year and serves businesses ranging from small e-commerce shops to major enterprises.
Under the Hood
EasyPost's approach is often described as "the Stripe of shipping," and the comparison is apt, but what's interesting is how much harder the shipping problem is in some ways. With payments, a credit card transaction is fundamentally the same regardless of the processor. With shipping, every carrier has different service levels, different dimensional weight calculations, different surcharge rules, different label formats (some are 4x6 thermal, some are 8.5x11 paper), different pickup scheduling systems, and different tracking event taxonomies. EasyPost had to build a normalization layer that translates all of these carrier-specific quirks into a consistent data model. Also, EasyPost offers a feature called SmartRate that uses machine learning trained on historical shipping data to predict actual delivery dates more accurately than the carriers' own estimates. This is possible because EasyPost sees delivery outcome data across all carriers, giving them a cross-carrier dataset that no single carrier has. The platform processes billions of dollars in postage annually, and its address verification API alone handles millions of verification requests per day.
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