Stamps.com

Stamps.com Shipping API

REST and SOAP APIs for USPS shipping services, including rates, label creation, tracking, and address verification.

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APIsJSON
https://artifacts.apis.io/stamps-com/apis.yml

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API entry from apis.yml

apis.yml Raw ↑ 
name: Stamps.com Shipping API
description: REST and SOAP APIs for USPS shipping services, including rates, label creation, tracking,
  and address verification.
humanURL: https://developer.stamps.com/rest-api/reference/serav1.html
baseURL: https://api.stampsendicia.com/sera
aid: stamps-com:stamps-com-shipping-api