I'm doing a run every 5 seconds for this API call:

url = "https://api.stackexchange.com/2.3/questions/no-answers?pagesize=30&fromdate={date_today}&order=desc&sort=creation&site=stackoverflow&access_token=" + accessToken + "&key=" + key

And sometimes I get this response:

  "error_id": 502,
  "error_message": "Violation of backoff parameter",
  "error_name": "throttle_violation"

How is it possible that I am exceeding the limit when it is 30 requests per second?

I don't know about this error answer and from what I've seen in other questions, it's about threshold crossing, but I'm not sure.

  • 1
    30 requests/s is the hard limit. You will nearly always be limited way before that by one of the multiple rate limiting mechanisms. You definitely shouldn't take that wording as "it's OK to blast up to 30 requests/s. Oh, and, yes, you can get such responses out of nowhere without having first actually gotten a backoff. In addition, the rate limits are (mostly) per IP address, so you need to also consider any SE API requests which might be being made by other things (e.g. other browser tabs, other userscripts, other browsers, other people, etc.)
    – Makyen
    Commented May 16, 2022 at 21:13
  • See also: meta.stackexchange.com/questions/243773/…
    – rene
    Commented May 17, 2022 at 16:32


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