Show live ShipEngine (ShipStation API) shipping rates from USPS, UPS, FedEx, DHL and 100+ carriers at WooCommerce checkout, with address validation. Free.

Live USPS rates at checkout that keep working: guided API setup, cached rates that respect the USPS quota, and a fallback so checkout never breaks.

Show live ShipStation rates at WooCommerce checkout with insurance and signature support. Buyers pay what shipping actually costs. Free.