4chan vs NAVER

4chan's API serves the same read-only board and thread data every page renders — board lists, catalogs, threads, and posts — as plain JSON from the dedicated a.4cdn.org host, with no registration, key, or authentication of any kind required. Media referenced by posts is served from the sibling i.4cdn.org host, and the project's own GitHub repository (4chan/4chan-API) hosts the reference client and doubles as the canonical documentation, including the rule to cap requests at one per second. Cross-origin use from a browser is limited in practice: both the docs and a live probe confirm the API's CORS policy only allows requests originating from 4chan's own board pages, so a third-party site must proxy requests server-side rather than call it directly from client-side JavaScript.

NAVER is South Korea's dominant search portal and internet platform, and its Open API program exposes NAVER Login (OAuth-based social sign-in), search across blog/news/image/shopping/book indexes, and utility services like Papago translation and map geocoding. Every call needs a Client ID and Client Secret issued through the NAVER Developers console, and most search endpoints support both JSON and XML response formats.