Not at the moment, but it's something we're working toward! We will have an API later this year, and embeddable Loomio decisions is on our roadmap.[0]

Of course as an open source project, if you had a strong use case you are more than welcome to jump in and build what you need it to do! [1]

[0] http://www.loomio.org/roadmap [1] http://github.com/loomio/loomio