When I started working on OddsPredictor I did not realise that there was a whole world of amateur and professional tipsters out there with a multitude of verification sites. These sites allow a tipster to log their sporting forecasts and the site records the bookmaker odds, either best or average, at the time the forecast is made.

The forecasts are fixed and cannot after a short delay be changed by the tipster. The site then monitors the sports and posts the results and statistics and rank the tipsters according to various criteria such as return on investment (ROI), number of predictions, country, sport, league, bet type etc. The only control the tipster has over these stats is that from time to time they can wipe the slate clean and start again.

There appear to be two different types of verification sites;
ROI by League
ROI by Month
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