Tripadvisor sets daily and per-second call limits on each key used to access the Content API. The rate limit measures on a 24-hour rolling window. The window starts with the first call made and resets 24 hours later. There is no fixed time of day when the window resets. If the window resets and no calls are made for a given key, a new window is not opened until the next call is made for a given key. The calls per second work similarly.

Daily call limit for Location details, photos and reviews APIs: determined by your daily budget
Daily call limit for search APIs: 10000
Queries per second (QPS): 50