The Analytics API endpoint allows you to make 100 requests within a 5 minute period, and 1000 requests per day. The Value Report endpoint allows 10 requests within a 5 minute period (100 requests per day).
Rate limits for the Analytics API are counted by the total number of components requested per address. For example, if a POST request to the Analytics API includes 3 addresses, it will count as 3 requests against the rate limit.
These limits can be increased with an enterprise level account. For a full breakdown of HouseCanary's API's Usage limits, please click here.