The content contained on these OBMMI™ (“Optimal Blue Mortgage Market Indices”) webpages are those of Optimal Blue, LLC (or “Optimal Blue”) and may change at any time without notice. Optimal Blue makes commercially reasonable efforts to provide reliable information, however it does not guarantee that the information is accurate, current or suitable for any particular purpose. In addition, this content is, therefore, provided on an “as is” basis and Optimal Blue makes no warranty, guarantee, or promise, concerning the accuracy or timeliness of indices listed and maintained by Optimal Blue nor is Optimal Blue responsible in any manner for any damages whether direct, indirect, special or consequential, howsoever caused, arising out of use of this web site, or reliance on the information it contains.


Optimal Blue’s OBMMI data may be linked to, utilized, posted on social media or data may be exported per the links on our OBMMI webpage without Optimal Blue’s prior written consent but subject to the provisions below. By linking to, posting or otherwise using any OBMMI content, Optimal Blue grants to Provider a non-exclusive, limited, revocable, non-transferable, non-assignable right to access, use and link to Optimal Blue’s OBMMI webpage(s) and, to use Optimal Blue’s name and/or logo solely for the purpose of properly identifying Optimal Blue’s content or the link from Provider’s website to the Optimal Blue website. In addition, Provider agrees as follows: 1) That the Parties are independent contractors and neither Party is an employee, agent, servant, representative, partner, joint venture, nor endorses the services or products of the other; 2) To clearly attribute the link or any OBMMI content directly to Optimal Blue, LLC.; 3) To not place information on Provider’s website that may objectionable, inappropriate or harmful; 4) With immediate effect, Optimal Blue may revoke Provider’s linkage or usage of OBMMI content at any time upon notice from Optimal Blue and may request Provider cease use of Optimal Blue’s name and/or logo upon notice from Optimal Blue; 5) The OBMMI data shall not be resold, relicensed or redistributed by Customer in whole or in part nor may the Customer use the OBMMI data alone or commingled with other data for any commercial purposes and 6) To comply with all applicable laws, rules and regulations related to Provider’s obligations and performance per these terms. If you prefer to publish Optimal Blue’s content on your website or in other materials, please contact Optimal Blue, LLC at datasolutions@optimalblue.com.


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The Optimal Blue Mortgage Market Indices™ (OBMMI™) are a new, rich source of data aggregated from the observed locks of approximately 30% of the mortgage market daily. As the provider of the industry-leading product and pricing engine (PPE) with over 800 customers and supporting over $600 billion in locks annually, Optimal Blue is uniquely positioned to provide the market’s most extensive and accurate view of the mortgage rates consumers are paying. There are other indices that exist, however, they are typically less frequent (updated weekly versus daily), less accurate (use survey or rate sheet data rather than actual borrower locked rate), and less timely (published on a week delay rather than a day). The purpose of this piece is to highlight some of the features of the OBMMI, examine some potential use-cases, and highlight some of the features of the series.

Download the complete Rate Index Research Paper.

The OBMMI™ methodology is straightforward, simply taking the average rate of all appropriate locks locked through the Optimal Blue product eligibility and pricing engine on a given day. No adjustments to the rates that account for buy-up or buy-down decisions made by individuals are performed.

These indices leverage data from Optimal Blue PPE lock requests (approximately 35% of all locks nationwide) aggregated on a daily basis and updated nightly with the previous day’s locks. Weekends and holidays are excluded due to lack of data. All applicable product types are included unless otherwise specified, and customers are categorized by mortgage company (82.49%), bank (15.30%), credit union (1.92%), and service provider (0.30%).

View Index Definitions

The Optimal Blue Mortgage Market Indices™ or OBMMI™ are uniquely positioned to provide unparalleled transparency into mortgage rates by utilizing observed, real-time lock data from approximately 35% of the market. This data is aggregated daily and split in informative and novel ways, covering not only conventional 30- and 15-year fixed rate indices, but also FHA, USDA, VA, and Jumbo, as well as many Detailed Mortgage Indices of the Conventional 30 group based on Loan-to-Value (LTV) and FICO credit score. The OBMMI deliver the most complete, frequent, and informative view of the mortgage rate environment based solely on observed, real-time transactions.