N3XT, a bank founded by former Signature Bank executives, will serve as the custodian for U.S. dollar collateral supporting forwards, options, and swaps on Clear Markets' swap execution facility. The arrangement integrates traditional banking custody services with digital asset derivative infrastructure. No go-live date, expected transaction volumes, or specific client names were disclosed in the announcement. The partnership marks N3XT's entry into providing institutional-grade custody solutions for derivatives trading platforms.