The Check-Mail API is a tool that checks if an e-mail is invalid or disposable. The API combines blacklists and advanced heuristics to check if a domain is valid. This API is free to use. A premium version is available for a higher number of addresses/domains. The Check-Mail API supports JSON for responses.
Eleven APIs have been added to the ProgrammableWeb directory in categories including Blockchain, Location, and File-Sharing. Featured is an API from the US Department of Veterans Affairs for Veteran health data, and an API that tracks user location using artificial intelligence.