Found 2 exchanges where ARPA is traded for BTC. According to the data on 22 July the most optimal price to exchange ARPA for BTC is ₿0.00000013 for 1 ARPA. This rate is fixed at Upbit Indonesia at the maximum trading volume of the pair ARPA/BTC - 0.1 BTC.
The maximum daily trading volume is observed in the ARPA/USDT trading pair at LBank and reaches ₿ 33.26 (0.156% of the exchange's total trading volumes) at the price ₿ 0.00000013 per 1 ARPA.
The minimum price to buy ARPA for BTC is 0.00000012 - on the exchange Upbit.
The maximum price to buy ARPA/BTC is 0.00000013 - on the exchange Upbit Indonesia.