
Reddit data API: subreddit listings, post/comment/community/user search, comment trees, top posts.
RedditAPIs API is a free Social API that requires apiKey authentication, is served over HTTPS and has unconfirmed CORS support.
Reddit API and API key for posts, comments, users, search, votes & DMs. From $0.0015 per call - no dev-app review, $0.50 free credits at signup.
Details from redditapis.com.

Unified API suite · now live
Geocode an address, validate an email, track a flight or pull stock data with one account, one dashboard and one API key.
Open Source Reddit Clone
The RedditAPIs API is provided by Redditapis (redditapis.com). Reddit API and API key for posts, comments, users, search, votes & DMs. From $0.0015 per call - no dev-app review, $0.50 free credits at signup.
Yes. The RedditAPIs API is listed in the Social category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The RedditAPIs API uses apiKey authentication, so you need to register for credentials before making requests.
CORS support for the RedditAPIs API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The RedditAPIs API is served over HTTPS, so it's safe to use in production.