Hello SeyiK99,
Thank you for reaching out to Constant Contact API Developer Support. My team is here to assist outside software developers with questions about building into Constant Contact's API.
Rate limits are set per API key/application rather than per account. Our Partner rate limits are 250,000 requests per day and 10 requests per second. These rate limits are configured upon request to our API Support team and are not automatically applied upon API key generation. If you’d like to confirm the rate limits of any existing key on your account or request that the rate limits of a newly generated key be increased to the Partner rate limits, please feel free to reach out to our API Support team at webservices@constantcontact.com and specify the API keys that you’re inquiring about.
Please have a look and let us know if you have any other questions!
Regards,
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