{"account":{"slug":"vio-bank-cornerstone-money-market","bank":"Vio Bank (MidFirst Bank)","name":"Cornerstone Money Market Savings"},"status":"recent","lastVerified":"2026-09-07","officialSource":"https://www.viobank.com/cornerstone-money-market-savings","history":[{"date":"2026-09-07","apy":"3.45% (as of September 2026, cut from 3.50% effective August 7, 2026)","monthlyFee":"$0 with e-statements ($5 paper statement fee otherwise)","minimumOpen":"$100","atm":"No ATM or check access; ACH transfers to linked external accounts","note":"Legacy snapshot without event-level evidence"}],"verificationEvents":[],"methodology":"https://creditcompound.com/how-we-rate#verification"}