There’s the XML RPC – the Remote Posting Protocol – that is already in use by WP.org Applications. What you’re searching for is wp.newPost. The API is extensible.
The URL for the XML RPC is
http://example.com/xmlrpc.php
To send data to WP, use xmlrpc_encode_request() where the first argument would be wp.newPost and second one your arguments for the post.
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