Our API directory now includes 44 booking APIs. The newest is the WuBook Wired API. The most popular, in terms of mashups, is the Rezgo API. We list 5 Rezgo mashups. Below you'll find some more stats from the directory, including the entire list of booking APIs.
Expedia recently announced the expansion of its API portfolio. The new API includes integration with in-destination, local activity suppliers. The API is included within the larger, legacy Expedia API environment and enables significant upsell, cross-sell, and broader partner possibilities.