Found 2 exchanges where Numeraire is traded for BTC. According to the data on 14 August the most optimal price to exchange NMR for BTC is ₿0.00013 for 1 Numeraire. This rate is fixed at Upbit at the maximum trading volume of the pair NMR/BTC - 0 BTC.
The maximum daily trading volume is observed in the NMR/TRY trading pair at Paribu and reaches ₿ 33.36 (1.74% of the exchange's total trading volumes) at the price ₿ 0.00013 per 1 NMR.
The minimum price to buy NMR for BTC is 0.00013 - on the exchange Upbit.
The maximum price to buy NMR/BTC is 0.00013 - on the exchange Upbit Indonesia.
Warning: some NMR markets show an abnormally wide spread — those quotes may be unreliable (thin liquidity or off-market trades). Cross-check the volume against several venues.