BART

 Adult riders using Clipper® who board VTA within one hour of exiting the BART station will receive a fare credit of $0.50.  Day Passes will generally only be available for customers using the Day Pass accumulator feature on the Clipper® card.  

VTA Express Bus fares using Clipper cash 
Adult Express Single Ride: $3.50
Youth Single Ride: $1.75
Senior/Disabled Single Ride: $1.00

*Current arrangements for riders transferring between VTA and neighboring transit systems are often complex and inconsistent. Transfer procedures elsewhere in the Bay Area also vary widely. This complexity of transfer policies has created challenges for customers, especially when using Clipper®. To address this customer service issue, transit operators throughout the region are transitioning to a coordinated transfer policy providing a consistent $0.50 fare credit for inter-operator transfers for Adult fares only AND only when Clipper® is used.

Official BART Website