Ethereum network transaction fees have risen significantly over the last two weeks following a surge in onchain activity, according to Coinbase. Coinbase’s weekly report, published on Sept. 27, notes that the average Ethereum gas fees between Sept. 16 and Sept. 26 were 498% higher than the monthly average, with the median transaction cost rising from $0.09 at the beginning of the month to $1.69. Coinbase analysts David Duong and David Han said that the spike in transaction fees was due to a surge in onchain activity on Ethereum. “There has been no single driver of increased activity,” the anal…