Monero Markets
# Source Pair Volume (24h) Price Volume (%) Updated
1 Poloniex XMR/BTC $ 80,158 $ 0.973021 93.70 % Recently
2 Poloniex XMR/USDT $ 1,605 $ 0.982781 1.88 % Recently
3 Poloniex MAID/XMR $ 988 $ 0.973484 1.16 % Recently
4 Poloniex DIEM/XMR $ 806 $ 0.973484 0.94 % Recently
5 Bittrex XMR/BTC $ 798 $ 0.971616 0.93 % Recently
6 Poloniex LTC/XMR $ 355 $ 0.973484 0.41 % Recently
7 Poloniex NXT/XMR $ 326 $ 0.973484 0.38 % Recently
8 Poloniex QORA/XMR $ 208 $ 0.973484 0.24 % Recently
9 Poloniex DASH/XMR $ 106 $ 0.973484 0.12 % Recently
10 Poloniex HYP/XMR $ 48 $ 0.973194 0.06 % Recently
11 Poloniex BCN/XMR $ 36 $ 0.973484 0.04 % Recently
12 Poloniex XDN/XMR $ 30 $ 0.973194 0.03 % Recently
13 Poloniex BBR/XMR $ 29 $ 0.973194 0.03 % Recently
14 HitBTC XMR/BTC $ 28 $ 0.946732 0.03 % Recently
Source
https://coinmarketcap.com/currencies/monero/#marketsBittrex makes 0.93 % of all XMR/BTC trade, HitBTC another 0.03 %
XMR/FIAT does not exist.
There is nothing wrong with trading being concentrated in one place, that is actually the most efficient configuration. (Why did everyone gather under a particular buttonwood tree instead of each standing on his own street corner?)
The important question to consider is what would happen if Poloniex were to suddenly disappear tomorrow and probably the answer, in practice, is that there would be a lot more trading on Bittrex. If all regulated exchanges disappeared then I bet we would see a lot more p2p and bitsquare.io.
The availability of many different mechanisms despite people not being stupid and focusing on the most efficient one makes Monero trading very resilient.
Agree, no point in referencing a dozen places to buy XMR in theory, where in practice you can use only 1 exchange (of course P2P can be a very good way too but we are talking exchanges).
No. In practice you can use any of the dozen+ places to buy XMR. The other options aren't less viable just because Poloniex is the preference.
In which of the exchanges mentioned above can someone buy 10k xmr without slippage?
That's 'in practice'.
Most of the time, none at all. Why does that matter?
Where can you buy 10K BTC without slippage? Where can you buy non-trivial amounts of anything at all without slippage?