Hello,
We apologize for the issue you are facing with the SEO Analyzer and the "API Error: HTTP 400" message. This error typically indicates that the server is unable to process your API request due to various reasons. Here are some common causes and solutions:
-
Website Under Maintenance: Ensure that your website is not in maintenance mode, as this can prevent access.
-
Check Website Status: You can check the status of your website by using this tool. Enter your website URL and see if it returns a 200 status code.

-
API Timeout: If your website takes more than 30 seconds to load, it may result in a timeout error.
-
API Requests Blocked by Firewall: Sometimes, server security or firewall settings can block our API requests. You may need to whitelist the IP 46.30.211.100
and the user-agent RankMathApi/2.0.2; https://rankmath.com
in your firewall settings.
-
Locally Hosted Website: The SEO Analyzer module will only work on a live site that returns a 200 OK status when crawled from an external site. If your site is hosted locally, the SEO Analyzer will not function properly.

Since you’ve already tried several troubleshooting steps, we recommend replying to this ticket with your website URL so that a human agent from our support team can assist you further and check if there are any restrictions on our end.
Thank you for raising this concern, and we look forward to resolving it for you!
Sources:
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
Why Am I Getting "API Error: HTTP 400" Error » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.