There is no way the site is even close to that many requests. Googled it, All links on search results no longer work.
I post on Constant contact forums and was directed here.
I keep getting this error using divi theme and divi overlays in latest wordpress.
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Thank you for reaching out to the Community. I am sorry to hear you are getting an error. We have a dedicated team for our API support and the best way to reach them is to send an email to firstname.lastname@example.org. You can also access the API forum pages by clicking the menu at the top right of this Community page and selecting Developer Community.
Thank you for reaching out to Constant Contact API Developer Support and for your patience. My team is here to assist outside software developers with questions about building into Constant Contact's API.
It looks like you may have already switched to one of our Inline Sign-Up Forms as a resolution. That said, our standard V2 API rate limit is 10,000 calls per day, and 4 calls per second. Your key was occasionally exceeding the calls per second limit. Ideally, the integration you're using should re-try any requests which fail due to this limit. If you've noticed that these requests are not being re-tried, or are concerned that they may not be, you should reach out to the integration's developer.