Develop an Odds-Matching Tool (sports betting)

I would like to develop a tool very similar to the one at [login to view URL] it would need to "somehow" get all of the odds, for all of the events, from at least 20 of the top bookmakers. There are plenty of sites that seem to compare the odds between different bookmakers, so acquiring the odds should be achievable. Then we just need to compare them to the odds on betfair which has an API service. Then once we have all of this information, of course will need to present it to the end-user in a nice clean easy-to-use way, (eg. like the one I mentioned at the start) IMPORTANT: When placing a bid, please send me a message telling me "how" you intend to do this, eg/ how will you achieve getting the odds? How will you code the tool etc? This needs to be legitimate so we can't scrape the odds and risk getting blocked or banned etc. or mess around with "hiding"/rre-routing IPs. etc. nothing dodgey please.