Item 1.01. Entry into a Material Definitive Agreement As previously disclosed in the Current Report on Form 8-K filed with the U. S. Securities and Exchange Commission (the “ SEC”) on October 7, 2025 (the “ October Form 8-K”), RYVYL Inc., a Nevada corporation (the “ Company”) entered into a Securities Purchase Agreement (the “ Purchase Agreement”), dated October 6, 2025, with RTB Digital, Inc. (“ RTB”), pursuant to which the Company sold an aggregate of 50,000 shares of its Series C convertible preferred stock, par value $0.001 per share (the “ Series C Preferred Stock”), to RTB in a private placement, which closed on October 7, 2025, for gross proceeds of $5,000,000 to the Company before offering expenses. On December 9, 2025, the Company and RTB entered into a First Amendment to the Securities Purchase Agreement (the “ Amendment”), pursuant to which the parties to the Purchase Agreement agreed to amend certain terms of the Purchase Agreement and the Certificate of Designation of Preferences, Rights and Limitations of Series C Convertible Preferred Stock (the “ Certificate of Designation”). Pursuant to the Amendment, such parties agreed to (i) increase the original purchase price for the 50,000 shares of Series C Preferred Stock by $1,500,000 to an aggregate of $6,500,000, to be paid at the signing of the Amendment by RTB to the Company, and (ii) increase the Stated Value (as defined in the Purchase Agreement) per share of Series C Preferred Stock in the Certificate of Designation from $100.00 to $130.00 for an aggregate Stated Value of $6,500,000. Except as stated above, all terms and conditions of each of the Purchase Agreement and Certificate of Designation remain unchanged and in full force and effect. The foregoing summaries of the Purchase Agreement and the Amendment do not purport to be complete and are qualified in their entirety by reference to the complete text of the Purchase Agreement and the Amendment. The Purchase Agreement was filed as an exhibit to the October Form 8-K. The Amendment is attached as Exhibit 10.1 to this Current Report on Form 8-K (this “ Form 8-K”) and is incorporated by reference into this

Item 3.03 Material Modification to Rights of Security Holders. The information set forth in Item 1.01 and Item 5.03 of this Form 8-K is hereby incorporated by reference into this Item 3.03.

Item 9.01 Financial Statements and Exhibits (d) Exhibits Exhibit No. Name of Exhibit 3.1 Certificate of Amendment to Certificate of Designation of Series C Preferred Stock, as filed with the Nevada Secretary of State of the State of Nevada on December 9, 2025 10.1 First Amendment to Securities Purchase Agreement, dated December 9, 2025 104 Cover Page Interactive Data File (embedded within the inline XBRL document). SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. RYVYL Inc. By: /s/ George Oliva Name: George Oliva Title: Interim Chief Executive Officer and Chief Financial Officer Dated: December 12, 2025