According to the source, OpenEden states it offers onchain access to a TBILL fund with AA+ sovereign exposure and custody by BNY Mellon, and claims it is trusted by more than 200 institutions (source: OpenEden on X, Sep 30, 2025). For trading relevance, AA+ refers to the current U.S. sovereign rating level cited by major agencies, aligning tokenized T‑bill exposure with U.S. Treasury risk, which is central to RWA yield instruments onchain (source: S&P Global Ratings; Fitch Ratings).