The Google Shopping Content Java SDK by Google aims to simplify API calls. An example shows hot to interact with Google Calendar, which can be useful to work with the Google Shopping Content API. Authentication Auth 2.0 intends to reduce the amount of code needed. See documentation available at https://github.com/google/google-api-java-client#Documentation
Although you may not realize it on the surface, DevHub, the free site builder and hosting platform, is effectively a very sophisticated mashup using over 40 different external APIs. The Seattle-based startup, now with 10,000 site publishers who've built over 100,000 sites, have recently launched a major upgrade with new site editing tools, more content (API) partners, and new monetization tools. Their core offering takes data from APIs and other content sources as a way for niche publishers quickly create content-rich sites along with built-in monetization options:
Looking through our directory of travel APIs and getting lost? That's no surprise; we've cataloged 168 of them so far. Fortunately, Valentin Dombrovsky, CEO of Travelatus did a great service by focusing on the 5 he says, "are the ones that offer interesting opportunities for your site—no matter who you are, an OTA, an airline or a hotel chain, for example." Writing for Tnooz, the magazine that talks travel tech, his 5 picks are rome2rio, DealAngel, Evature, Flightstats, and InKnowledge's Taxi Fare Calculator.
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.