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I have seen it before only once or twice in my meanderings with my main OSS project, ibGib but I'm still not to the point of actually doing anything WRT donations with that. Then recently I thought askGib was far enough along to try it out, and I use shields.io for askGib's two existing badges. I saw that they use Gratipay and I decided to go through all of your docs and everything. I must say I really enjoy your entire approach.
I especially like your dedication to transparency through and through, as it's a subject near and dear to ibGib - which in its current incarnation is much like a semantic-level (as opposed to a text-file-level) "version control". Kind of like version control at the ontological level if you're familiar with RDF/OWL (only recently became aware of them myself).
Anyway, tl;dr (too late), shields.io uses Gratipay!