Hi, my name is George, and I'm a web crawler expert. I came across your project, and I have to say I'm really impressed.
I have experience working with betfair historical data (.tar) and I'm sure I can help you get the job done. Regarding your specific request, I have some questions to make sure I'm on the same page: (1) How many years of Betfair data do you need? and (2) Are you looking for comma-separated values (CSV) or any other preferred format?
At my company, we already worked on a couple of similar projects, so we are well versed when it comes to the technical details of data crawling from the Betfair API. I believe I'm the perfect fit for this job, so let me know if you are interested in further discussing it.
Thanks for reading,
George