Default Los Angeles Metro TAP Card -> NFC?

I did some Googling and in another forum saw a poster mention that LA Metro TAP Cards use NFC. I sometimes forget my TAP card as I lighten my every day carry to a minimum as I head out at night. But I always take my phone.

Is there an app that lets you use the Nexus 5's NFC capabilities to store TAP Card fares? I Googled and searched here but didn't see too much for LA Metro. There's apps for other cities but not LA. Anyone have any thoughts or point me in the right direction?