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It is impossible to say in general terms whether it is fraud. For a single guest post, I think it’s easy money for the agency and way too overpriced for you.
Especially if you don’t know anything about this area, it’s easy to find yourself contacted by agencies who will take massive advantage of it financially to your detriment.
A single guest post will have minimal, if any, relevance to improving your website’s visibility. Naturalness and relevance also play a big role in where they are then published.
You should think in advance about what goal you are pursuing with your website.
I would recommend that you either do a little bit of search engine optimization yourself or look for an agency, even on a recommendation, who can make suitable suggestions for you and tailor a good cost-performance package to your needs.
