Portland-based Chirpify is on a roll, quite literally.

The payments-through-Twitter platform already had the likes of Green Day, Wale and Kat Graham use its service, but now Rolling Stones legend Keith Richards is on Chirpify as well.

Richards is selling a limited edition t-shirt for $29.99 and is using Chirpify to accept payments. The folks down there in Portland must be doing a few things right.

Here’s how Chirpify works. Artists upload content to a Chirpify dashboard, and click to tweet. Consumers then use Chirpify to connect their Twitter and PayPal accounts, and once linked reply to the tweet with something like “@favoriteartist buy” a certain track.

Chirpify then sends a secure download link via direct message and/or email to download the song or other digital content.

Chirpify landed $1.3 million in its first round of funding last April from a group of angel investors that includes BuddyTV CEO Andy Liu; Geoff Entress; former Facebook executive Rudy Gadre; HootSuite CEO Ryan Holmes; Voyager Capital and others.

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