UPI mechanism limit increase expands permitted blocked-funds threshold for debt public issue applications, facilitating uniformity and ease of investment. The circular amends Chapters I and II of the Operational Circular to raise the permissible per-application limit for using the UPI mechanism to block funds for applications in public issues of non-convertible securities and related debt instruments. It modifies application-process provisions, intermediary responsibilities (including Sponsor Bank role) and affirms that UPI-based blocking via app/web interfaces and intermediaries is available for applications within the revised UPI limit. The amendments apply to public issues opening on or after May 1, 2022.