The best replacement for rest api is soap.

The best alternatives to rest api are rated as following:
★★★★★  soap
★★★★  web service
★★★★  sdk
★★  streaming api
★  web services

Your alternative for rest api is not listed? Suggest!
Speaking about rest api, one probably shouldn't forget about authentication.

Other search terms related to rest api and their ratings are:
★★★★★ authentication
You have in mind a companion for rest api and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of rest api in all years. Click on graph for more.
rest api
soap
web service