Bitcoin price dipped below $10,000 in last two days but since yesterday the price is close to 10k mark and it is swinging up and down while altcoin market is showing green color. The reason for swing are unlimited but the main reason is resistance around $10,000 mark and some traders want to make profit out of the up and down in the value of bitcoin.
Image Source : https://coinmarketcap.com/currencies/bitcoin/#charts
Some coins like Ethereum classic and Nano have outclassed other coins in top 30. The market Capital of altcoins has also increased. At this time the value of Bitcoin on Coinmarketcap is $10,238 which is not today's high but close it which was $10,487. The value of bitcoin on Bitfinex is $10,091 which is 2.2% higher than what it was 24 hours ago.