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There's few tools online offering traffic estimate service. In my opinion none is accurate enough to be relevant. you just need to try them with url of websites you have log access to see how poor their guess are. as far as i know moz doesn't offer such a tool if i have to name one of those tool i would name semrush, when I tested it's accurancy I found it to report traffic volumes between 10% and 100% wrong, which is more accurate than many others and it's still giving you an idea of a website traffic