STOXX Ltd., part of the ISS STOXX group of companies, today announced the launch of the iSTOXX® USD Across-the-Curve Credit Spread Index (AXI) and the iSTOXX® USD Financial Conditions Credit Spread Index (FXI), in collaboration with SOFR Academy, Inc. The transparent, rules-based indices are designed to complement the Secured Overnight Financing Rate (SOFR).