• Euro Overnight Index Average (EONIA) is the average base overnight rate at which European banks lend to each other in euros.

  • EONIA is the interest rate for overnight loans between European banks.
  • The Euro overnight average is calculated by the European Central Bank (ECB) based on loans from 28 panel banks.
  • Due to European regulatory reforms, EONIA was replaced in 2022 by a more comprehensive benchmark called ESTER.