Global credit default swap (CDS) markets experienced unprecedented whipsaw spread realizations during March and April 2020. While the main source of market uncertainty was the Covid-19 pandemic, the March 2020 oil price war between Saudi Arabia and Russia added “fuel to the fire”. In this paper credit market fluctuations, measured by the levels of the main and most heavily traded index instruments, are analyzed and compared with the analogous index realizations during the 2008–9 financial crisis. The Covid-19 credit market fluctuations exceeded those during the financial crisis in terms of daily amplitudes and the rates at which spread tightening followed the initial spread widening. The fast-moving credit markets led to record index trading and clearing activity at all three major CDS clearinghouses. Clearinghouse volumes and general clearing trends during the onset of the Covid-19 pandemic are presented in the context of the observed explosion in market volatility. The continuous development and investment in central clearing over the last 10 years greatly contributed to the financial stability of the CDS markets during the Covid-19 crisis, providing increased market transparency, capital efficiency and robust risk management services in the presence of record daily volumes, open interest levels and mark-to-market payments.