STET SA, whose name refers to Systèmes Technologiques d'Echange et de Traitement (lit.
STET was established in December 2004 by France's six main banks, namely BNP Paribas, Crédit Agricole, Crédit Mutuel, Groupe Caisse d'Épargne, Groupe Banque Populaire, and Société Générale, to replace a previous system known as the Système interbancaire de télécompensation [fr] (SIT).
The initiative was intended as a French banking industry response to the creation of the Single Euro Payments Area (SEPA).
In March 2013, the CEC, which operated as interbank clearing house in Belgium, in turn completed its migration to the STET platform.
[2]: 148 CORE migrated its SEPA Direct Debits (SDDs) on 21 November 2016 to the pan-European platform SEPA.EU, and its SCTs in 2018.