Bitcoin traded in a range of less than $1,000 early Friday, near $81,500, after falling to $81,000 on Thursday, ending a volatile week that saw swings of $3,000. Nasdaq 100 futures were little changed after their worst performance since June, while a chipmaker ETF saw a slight premarket rise. Brent crude prices hit their highest level since early May, complicating the inflation outlook for the Federal Reserve ahead of its October 27-28 meeting.