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perhaps some semi-decentralised exchanges like COSS.IO and NEXT.Exhange and fully-decentralised exchanges like Etherdelta and Radar Relay.

The time for the 0x-protocol to shine has come.

I think DEXs will gain in popularity as more centralized exchanges are exposed to being bad actors. Tethers might be a great boon for the cause.

cool, but what is a tether?

I've looked at eterhdelta and 0x. Both are exclusively in the ether/erc20 domain. Please correct me if I am wrong.

cool, but do you have any info on the liquidity at Etherdelta and Radar Relay?

Can't say "semi" decentralized makes any sense, to use. Either it's decentralized or it's not, kinda hard to be inbetween-- like being semi-pregnant, no?