Daily transactions on Robinhood's blockchain have fallen 42% from mid-September as the slowdown spreads from network fees to trading activity. The network averaged 6.2 million transactions a day during Oct. 2-8, down from 10.8 million during Sept. 10-16. Robinhood will continue covering network fees on token swaps worth more than 50 cents through Dec. 31 to help revive activity. Weekly trading volume has also turned lower.