Every major hotel chain and many independent properties have "Best Price Guarantees" that, well, guarantee you'll get the best price with them.
Often if you CAN find a lower rate at an OTA, they'll give you some kind of incentive (aka an extra credit etc.)
Examples:
* Marriott - https://help.marriott.com/s/article/Article-22050
* Hilton - https://www.hilton.com/en/p/price-match-guarantee/
* IHG - https://www.ihg.com/content/us/en/customer-care/bwc-lp
* Hyatt - https://www.hyatt.com/info/best-rate-guarantee
There are a few exceptions, such as Hotwire-style hidden rates, or rates negotiated for conferences and events, but displayed rates from places like Booking.com, Expedia and the like nearly always qualify.