Eonia^® FAQs

Eonia's Underlying Interest is the rate at which banks of sound financial standing in the European Union (EU) and European Free Trade Area (EFTA) countries lend funds in the interbank money market in euro.

Provided prior registration, Delayed Eonia^® data (available with a 24-hour delay) can be consulted online free of charge on a backward rolling period of 25 publication days.

Historical Eonia^® data series may also be obtained upon written request by email to subscriptions@emmi-benchmarks.eu.

These data may solely be used for non-commercial purposes.

The European Money Markets Institute does not distribute Live data directly to users.

Authorised Information Vendors distribute our data through terminals, data feeds, or any other services they provide.

For more information about Authorised Information Vendors, please consult our FAQ on Subscriptions.

Since 2 October 2019, Eonia^® for day T is available every TARGET2 day on T+1, at or shortly after 09.15 CET. 

The Underlying Interest defines the market or economic reality that the index seeks to measure.

It represents the more fundamental element of a benchmark’s specification, as it defines the objective for establishing the benchmark, and is intended to be an enduring statement of the economic concept of what the benchmark seeks to represent.

Eonia^® represents “the rate at which banks of sound financial standing in the European Union and European Free Trade Area (EFTA) countries lend funds in the interbank money market in euro.”

Since 1 October 2019, Eonia^® is calculated with a reformed methodology tracking the Euro Short-Term Rate (€STR) of the European Central Bank (ECB).

Published for the first time by the ECB on 2 October 2019 at 08:00 CET, the €STR reflects the wholesale euro unsecured overnight borrowing costs of euro area banks. Eonia^® is calculated as the €STR plus a spread of 8.5 basis points.

Prior to 1 October 2019, EONIA^® was computed as a weighted average of overnight unsecured lending transactions in the EU and EFTA interbank market.

Eonia’s cessation is planned on 3 January 2022. The European Money Markets Institute will continue to publish EONIA every TARGET2 day until discontinuation.

The European Money Markets Institute encourages all Eonia^® users to accelerate their transition to the €STR and to finalise their phasing-out by that date.

The European Securities and Markets Authority (ESMA) supervises The European Money Markets Institute since January 2022.

Please e-mail your questions to info@emmi-benchmarks.eu or use our Contact form.

Eonia^® is a registered trademark of The European Money Market Institute a.i.s.b.l. All rights reserved. All uses of this name must indicate that the index is a registered trademark.

A Licensing Agreement with The European Money Market Institute is mandatory for all commercial use of the registered trademark.

For any further question related to the use of The European Money Market Institute’s trademarks or access to our rates, please refer to the Rates plans page of this website or contact our Users Services Team with our Contact form.