Start-ex.com

[mst100]

website: https://start-ex.com/

Listing under Dash & GBX is free
Other markets are free if we aren't listed anywhere else

they require at least 100 tweeter followers and 500 members on discord

listing info: https://start-ex.com/docs/listing
ANN: https://bitcointalk.org/index.php?topic=5054082
discord: https://discordapp.com/invite/888qHr2
tweeter: https://twitter.com/start_exchange