EONIA is a derivative of ESTR and EONIA will not be published anymore as of January 2022. The new definition of EONIA, since October 2019, is ESTR + 8.5bps. EONIA does not add any financial advantage, but add legal risks. The fixed spread is often described as trivial. To my point of view it is not so trivial in practice as a 8.5 bps spread on the overnight rate is not the same as a 8.5 bps spread on the swap rates. There is a tradition of OIS with spreads, but the spread is on the final (compounded) rate, not on each fixing. The situation is different for LIBOR swaps, where there are composition with spreads (the famous straight, flat, spread exclusive and none, compounding methods). Similar issues are probably true with collateral. From a system perspective, ESTR + 8.5 bps is not the same as EONIA. As of 15 June, around 43,946 bn USD equivalent of EUR OIS have been cleared at LCH year-to-date. That correspond to roughly 8,000 bn a month. As end of may, there were 492.75 bn USD e...