Alexander Lang has been working on a USB breakout board, he writes:
I often need to intercept USB signals for decoding and measurement purposes. I cut a cable apart last time I needed one but to be honest I much prefer doing things properly. I also noticed that nobody seems to sell a similar product on Ebay, Aliexpress or Amazon! I did find a vendor in the USA on tindie. I also found this product on tindie which is similar but has a current monitoring circuit built in.
Either of these products would work for my purposes but the first product’s shipping costs from the USA seem a little extravagant and I only wanted one or two.
The second product uses pin headers to allow connection which are a bit close together for my liking. It’s often the way of things. When I cannot obtain what I want I make my own!
More details on his blog.