This is an old post, but may a few answers below the OP's question can help other people that have the same question.
Antminer X3 worked on a CryptoNight algorithm. So, as long as you mine some coin that has CryptoNight algorithm, those X3 would work. And also, you can point your Antminer X3 to NiceHash.
Topic: Will these cryptonight's miners even work? (Read 75 times)
I was really interested in buying Bitmain's X3 but when i saw the price and also the announcement about Monero fork, i sad to my self wait 
Can these miners work on another coin or..? Like Electroneum or Bytecoin? Or even on Nicehash?
Can these miners work on another coin or..? Like Electroneum or Bytecoin? Or even on Nicehash?
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