NPXS is listed on cryptofacil.com with BTC, ETH and USDT pairings personally I have never used the exchange but they are running 0 trading fee promo until 30 April
Majority of the people like to trade on big exchange due to huge liquidity and good security provided by them. I also think it is better to stay on big exchanges while they are supporting airdrop too.
Yes, it was a big advantage to have it in a big reputable and top exchange as any coin both legit and scam coins wants it to have a good trading volume. As of now that npxs is not moving but its current progress in real world is a beast that waiting for his time to get out of his comfort zone.