Somebody asked a support for adding XCN to C-CEX exchanger. How much does it cost? C-CEX is old exchange, though not with large volumes.
"You can vote for adding coin to our exchange here by depositing BTC to it's address. We are adding 1 winner coin each 14 days. All BTC votes are taking into account after 1 confirmation and rechecked at the moment of voting round finish. BTC sent to voting address are non-refundable. Coin dev must provide block explorer, website or forum thread with wallet links including source code link (github preferrable). Please, make sure coin is compatible with our existing interfaces."
one vote costs 1 mBTC.
current top of the list:
Borderless (BDS)
https://bitcointalk.org/index.php?topic=2334652.msg23747767#msg23747767 1PsUWcBsGfV1LVCfqPJu3vxSfytgRAiGSM 7.516 BTC 1 7517 Cast vote
SBC (SBC)
https://bitcointalk.org/index.php?topic=2196040.msg 1LbxARNGZW83mgQ5kdskMNMvUD593uKHkh 4.683 BTC 0 4683 Cast vote
GiantBirdCoin (GNB)
https://bitcointalk.org/index.php?topic=2195685 18AkEMhd9dGfPjbinvcXTu5xfFZyvnB1Wj 4.445 BTC 7 4452 Cast vote
CHAOS (COS)
https://bitcointalk.org/index.php?topic=1950029.0 1P8CHZX4LL1AXq4NhAG4DxqKc8f1WXB6Du 2.950 BTC 3 2953 Cast vote
ATMCoin (ATMC)
http://bitsfinancenews.com 1XJKsLSCJ4qVs5Ax2qAf7ka6D4oD9jt2C 2.473 BTC 1 2474 Cast vote
Bitbar (BTB)
https://bitcointalk.org/index.php?topic=196125 1AzkQfqMUBAQLQf1oZXVKF9VVj1PA3gSVD 2.261 BTC 16 2277 Cast vote
HotGoldCoin (HGC)
http://www.hotgoldcoin.net 1AZVWWE6Qc34o2JGLHAPp8v7Mo81wPjbq3 2.072 BTC 3 2075 Cast vote
cannation project (CNNC)
https://bitcointalk.org/index.php?topic=1867196.0 18FcZeSpxxqHSCBu7apvaZ83ysSawUBiSd 1.654 BTC 117 1771 Cast vote
Internet Of People (IOP)
https://bitcointalk.org/index.php?topic=2243467 1MGuMHRPdYiBidbkWQowuUssm1mHHqGa9E 1.498 BTC 2 1500 Cast vote
ProfitCoin (PFTC)
https://bitcointalk.org/index.php?topic=1885897.new#new 1PwpHf9HQLn5hf2VMLuZpmokKpeMrJeDDK 0.085 BTC 1200 1285 Cast vote