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The USPS Web Tools API provides basic functionalities like tracking, rate calculations, address validation, and label generation, making it ideal for small businesses or e-commerce websites needing simple integration. It requires a USPS Web Tools account and is easy to set up. On the other hand, the USPS API offers more advanced features for complex shipping solutions, including bulk shipping, custom logistics, and enterprise-level integration. While both APIs are used for interacting with USPS services, the Web Tools API is simpler, while the USPS API is better suited for larger operations needing a more comprehensive shipping and logistics system.