The EURO1 is a large-value payment system for same day euro transactions at a pan-European level, which processes transactions of high priority and urgency, and primarily of large amount at a domestic and cross-border level on a multilateral net basis.

EURO1 processes in excess of 250,000 payments per day, with an overall value of approximately €210 billion. EURO1 is based on a messaging and IT infrastructure provided by SWIFT.