Hello,
We’re sorry to hear that you’re experiencing an API Error: HTTP 400 error while using the Rank Math SEO Analyzer. This error typically indicates that the server is unable to process your API request for some reason.
The HTTP 400 error can be caused by various issues, including website maintenance, website status, API timeout, API requests being blocked by a firewall, or if your website is locally hosted.
To resolve this issue, you can follow the troubleshooting steps outlined in our knowledgebase article on API Error: HTTP 400. This article provides detailed information on why you might be seeing this error and how to fix it.
If you’re still facing problems after following these steps or have any further queries, please feel free to reach out to our support team directly from here, and we’d be happy to assist you further.
Thank you for bringing this to our attention, and we appreciate your patience as we work to resolve this issue for you.
Sources:
Why Am I Getting “API Error: HTTP 400” Error » Rank Math
Google URL Inspection API Integration in Rank Math
I tried all solutions but nothing is working
Hello,
Thank you for your patience.
Could you please share the affected URL so we can check as well?
Meanwhile, head over to Rank Math > Status & Tools > Database Tools > and click the Clear SEO Analysis
and Remove Transients
buttons to flush the SEO Analysis cache (if not yet)

Once done, clear your website and any server-level caching on your site before doing the Sitewide analysis again.
Let us know how this goes.
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.