I've paid for the integration to take place, so we'll be added to coinpayments.net soon!
We'll need to contact shops that currently use coinpayments (there's a handy store directory on their site) to accept Gridcoin once it's integrated.
We should also try to get each whitelisted BOINC project to add a GRC donate button which uses coinpayments. That'll help with meeting the min trading volume.