Sweden currently uses the Swedish krona (SEK) as its currency but is obligated to join the eurozone at some point in the future. A referendum on adopting the Euro was held in 2003, with the No side winning 56% vs 42%.

This market resolves positively even if only a transition period has begun, where the Euro is the official currency but Swedish krona is also legal tender.

Resolves based on official statements by Swedish authorities.

https://en.wikipedia.org/wiki/Sweden_and_the_euro