From Matthew Graham at Mortgage News Daily: Mortgage Rates Just Barely Lower Ahead of Key Inflation Data

Mortgage rates spent the entirety of last week at the same levels based on end-of-day rates sheets from the average lender. ... Whereas today was fairly calm for markets and rates, tomorrow brings bigger risks. This is primarily due to the release of an important report on inflation in the morning. [30YR FIXED - 4.5-4.625%]
emphasis added
Tuesday:
• At 6:00 AM ET, NFIB Small Business Optimism Index for February.

• At 8:30 AM, The Consumer Price Index for February from the BLS. The consensus is for a 0.2% increase in CPI, and a 0.2% increase in core CPI.