CBP DTOPSU.S. Customs and Border Protection
1.0.3 Varies with device
The CBP Decal and Transponder Online Procurement System (DTOPS) app lets you place orders and pay online for annual user fees (transponders and/or decals) and single crossing fees associated with crossing the borders into the United States. Transponders are used for commercial vehicles while decals are used for private aircraft and private vessels (30 ft+). Single crossing fees apply only to commercial vehicles.