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Re:Searx – A privacy-respecting, hackable metasearch engine by JD557 on Monday July 25, 2016 @12:12PM (#12159629)
They could limit requests by IP without storing them explicitly.

They could use something like a count-min sketch to store how many requests a certain IP has executed, and clean the sketch every minute, for example.

The limit would not be exact, though.

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