The Death By Captcha developers have just released a beta of their shiny new NoCAPTCHA by token (reCaptcha v2) solving method!
They have been working on this for a while, and they promise the solution will soon be the solving reference for these challenges.
Details for implementation can be found here (requires login and DBC credits). However, with a promo code (below in the blue box) you don’t need to deposit money to see the details. Ping the service with the promo code, and you’ll get 3K free images . These you can use to see API details or test the service.
P.S. The success of the solving method strongly depends on the quality of proxies you use, so it’s recommended to use good ones! See a post on rotating proxies.