In German finance, Kurs is the everyday word for the price of a security or a currency, and Kurse is its plural. In education, Kurs means a course, so Kurse are lessons or classes. The address carries both readings at once, which allows a project to combine market data with teaching. The .org ending adds a community and non-profit tone, suitable for an initiative that wants to inform and educate audiences in Germany, Austria and Switzerland.
bitcoinkurse.org belongs to the Bitcoin Akademie DACH set of education vocabulary, and the same name is held on the Austrian and Swiss endings; the three can be acquired together. Typical projects are a non-profit course programme for beginners, an association running workshops at schools and adult education centres, or an open price reference with explanations of how Bitcoin rates are formed.