We do have Gridcoin on our discovery list but don't plan on adding it at this time. Stay tuned on our social channels though as we will announce all new additions there:

• Newsletter Sign-up: http://eepurl.com/bdbzO1
• Facebook: https://www.facebook.com/shapeshiftexchange
• Twitter: https://twitter.com/ShapeShift_io
• Community Slack Channel: https://shapeshiftcommunity.herokuapp.com/