Pirate Ship offers USPS discounts up to 87% off and excels with...

https://mike-wiki.win/index.php/Does_Shippo_Have_a_REST_API_I_Can_Use_for_Shipping_Automation%3F

Pirate Ship offers USPS discounts up to 87% off and excels with straightforward, no-fee shipping labels, perfect for small sellers focused on USPS. However, if you need DHL Express or prefer live chat support, Shippo’s got you covered