Every successful (200 OK) response contains 3 headers to help you manage your rate limit.
Your total rate limit. All API keys have 20,000 by default until a rate increase is approved.
How many requests you have left before your rate limit is exceeded.
The UNIX timestamp for when your rate limit will reset to the value in X-Ratelimit-Limit.
You may want to keep track of the X-Ratelimit-Reset value if you think you are going to run out of requests because when the API responds with 429 Too Many Requests, the header is presently no longer available.