Stakenet is working on exchange to support Lightning network. It is 85% finished.
https://stakenet.io/Best thing about it is that it will be decentralized, with cross-chains and low fees
That's good news. I've been looking for XSN's roadmap for a while, and it's quite promising. Sometimes, I wonder why such a good cryptocurrency is undervalued these days. Perhaps it needs more marketing/promotion in order to drive adoption within the mainstream world. The XSN Lighting Network exchange seems to be getting closer towards launch, though. It could be a blast to use, if it gathers a wide array of crypto trading pairs to choose from. So far, the LN crypto exchanges I've toppled with, have limited trading pairs. But I hope that the number of exchanges accepting LN payments would increase over time, as Bitcoin's Layer-two scaling solution grows at an unprecedented rate.
In the meantime, I'll stick with "FixedFloat" and "CoinPlaza". They seem to be the best (and only) exchanges available which accept LN payments. My most favorite is "CoinPlaza" because it has a trading pair for Monero (XMR). It's extremely convenient to exchange "BTCLN" to XMR, since Bitcoin's Layer-two solution is much more anonymous than the main chain itself. This would give a greater level of privacy to the end user, in my own opinion. And without the need for ID verification (KYC), the previously mentioned instant exchanges are a blast.
Nonetheless, I'm eager to know about more Lightning Crypto Exchanges once they become available. I'm very hyped with the LN right now (although still in active development) since it delivers instant and cheap payments for anyone using Bitcoin. Imagine the potential this has to transform not only crypto exchanges, but also social media interaction (by tipping others), and more. With proper marketing/promotion, I'm sure that the LN ecosystem will grow "to infinity and beyond".