They don't have their own index, but they implement a whole lot of other indexes (Scopia, Yahoo, Bing, Wikis, YaCy, Netluchs, Exalead, Yandex, Die ZEIT, OneNewspage, Infotiger). The 3 big indexes are the ones that charge metager for providing search results, and those costs are what you pay for, and since it's a non-profit (https://suma-ev.de/), the costs are close to what you would pay if you had access to API pricing.
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