1 BTC = 8591.2467 USD (average from all sources)
1 BTC = 8509.0 USD (source: https://kraken.com)
1 BTC = 8711.56 USD (source: https://coinbase.com)
1 BTC = 8567.5768 USD (source: https://poloniex.com)
1 BTC = 8576.85 USD (source: https://www.bitstamp.net)