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Have the same problem for mine (www.splitbrain.org). It complains about unclean URLs which look just fine to me.

I use Alexa API.

Please recheck your website.

I did curl -I indicates a 301 redirect...

I've noticed the same: My site does 301 redirect www -> no-www, but you service doesn't detect this properly (I've entered the url without www). I've double-checked the headers on my site, the problem is in your script...