Curious as to what Gratipay was, so I did a little a research. It turns out the maintainers of GratiPay have handed over all assets over to Libreapay[0]. Libreapay appears to be a fork for Gratipay. This might be what you have been looking for!

[0] - https://liberapay.com

*I have no affiliation with liberapayn just did some curious research.