IG directed me to check out Nadex as their service is UK only. I spoke with one of the reps at Nadex and you can get access to the market data API for a one time fee of $500, but you also have to apply and associate your identity with them. Not sure if that would work so well for anonymous delegates but it could be one possible source of OIL feeds for public delegates. Of course as the regulatory waters are murky, this could also have some implication w.r.t. the CFTC saying they can regulate crypto derivatives.