Hi Levi,
FedEx One Rate® packages will be available after an eligible service is selected from the Carrier Service drop-down box.
The following services are eligible for FedEx One Rate®: FedEx First Overnight®, FedEx Priority Overnight®, FedEx Standard Overnight®, FedEx 2Day®, FedEx 2Day A.M.®, and FedEx Express Saver®.
Thanks,