It's not often we see an API "go on sale". But that's what Google is doing with their announced a Google AdWords API. They have a new version update but along with it, they have "holiday season API sale pricing". The details of the holiday sale are spelled out in the October 20 AdWords API blog post "Happy Holidays! Enjoy more API units":
What do you get when you use APIs to mashup retail shopping, auctions, analytics, reviews and coupons? For the VC-funded startup Mpire, you get a very useful set of shopping tools, what they call a universal shopping experience.
BIPS, Bitcoin payment system, allows users to buy or sell online using Bitcoin digital currency. In addition to Bitcoin transaction-based apps and an e-wallet, BIPS provides an API that users can integrate with existing workflows and tools. Merchants can utilize Bitcoin currency alongside traditional currency transactions.