Fenix provides out of the box support for many carriers (100+) across the US and the world. The retailers will not be charged any fee to enable/disable the carriers. Some of the carriers supported by Fenix are listed below.
...
Australia
Allied Express
Aramex
Australia Post
CouriersPlease
DHL Express
FedEx
Hubbed
Quantium
Sendle
StarTrack
TNT
Toll
UPS
Austria, Belgium, Belgium, Cyprus, Czech, Bulgaria, Denmark, Finland, Hungary, India, Indonesia, Ireland, Japan, S.Korea, Latvia, Mexico, Lithuania, Luxembourg, Malaysia, Norway, Phillipines, Poland, Portugal, Romania, Slovenia, Spain, Sweden, Switzerland, Thailand, Taiwan, Turkey, Vietnam
DHL Express
FedEx
UPS
Canada
FedEx
USPSUPS
DHL eCommerce
Newgistics
Ontrac
Canada Post
DHL Express
Purolator
Canpar
Seko
Estonia, Greece, Israel, Italy
DHL
FedEx
UPS
France
Chronopost
ColisPrive
Colissimo
DHL Express
FedEx
MondialRelay
UPS
Germany
DHL Express
Stamps.comDPD
LasershipFedEx
Access WorldwideUPSFirstMile
Great Britain
AsendiaXDelivery
DHL Express
LSODPD
Better Trucks
Swyft
Uber
Australia
Australia Post
Sendle
UPS
FedEx
DHL Australia
Aramax
Couriers Please
My Post Business
Star Track
Seko
Canada
FedEx
UPS
DHL eCommerce
Canada Post
DHL Express
Purolator
Canpar
Seko
United Kingdom
FedEx
UPS
Royal Mail
DPD
DHL Express
Parcel Force
...
Evri
FedEx Cross Border
FedEx
Royal Mail
Parcelforce
RoyalMail
UPS
Hongkong
Aramex
DHL Express
BoxC
FedEx
HKPost
Quantium
SFExpress
UPS
Iceland, United Arab Emirates
DHL Express
FedEx
Netherlands
DHL Express
FedEx
PostNL
UPS
New Zealand
Aramex
NZ Post
UPS
DHL Express
FedEx
Singapore
Aramex
DHL Express
FedEx
J&T Express
Janio
NinjaVan
Qxpress
SingPost
UPS
United States
FedEx
UPS
USPS
DHL eCommerce
Newgistics
Ontrac
DHL Express
Stamps.com
Lasership
Access Worldwide
FirstMile
Asendia
XDelivery
LSO
Better Trucks
Swyft
Uber