An interesting portion of this is the Restricted API, which limits the number of sites to 10, but allows an unlimited number of requests at the $5/k rate. There

An interesting portion of this is the Restricted API, which limits the number of sites to 10, but allows an unlimited number of requests at the $5/k rate. There doesn't seem to be any restriction on business use, which seems like a good option for paid, ad-free and anonymized code search, since 95% of the desired results are from three sources: GH, SO and Reddit.