The Proxy disc by Axiom Discs was PDGA Approved as of 9-24-2014.

"The Proxy is our straightest flying putter. It can hold a very straight line even with low power. Throwers with moderate power will be able to achieve hyzers, panning anhyzers, as well as straight shots depending on the angle of release. It features a similar comfortable feel as the Envy which makes it very reliable and forgiving. The Proxy is set to release this winter." - by Axiom Discs