Chinese Text Project vs Synonyms

Chinese Text Project's JSON API resolves opaque CTP URNs into full text, titles, and subsection metadata across its library of pre-Qin and Han-era classical Chinese works, and underpins the site's own browser plugins for text lookup and annotation. Anonymous requests work without any key but are rate-limited; logged-in accounts get a higher ceiling, and academic institutions can arrange a subscription that issues API keys for extended, programmatic access.

The Synonyms API is STANDS4 Network's word-lookup service, returning synonym, antonym, and part-of-speech data for a submitted word as either JSON or XML from a single GET request against stands4.com's shared services endpoint — the same backend that powers sibling STANDS4 properties like Rhymes.com and Definitions.net. A live GET and OPTIONS preflight against that endpoint both echoed `access-control-allow-origin: *`; the service is free for up to 100 queries/day, with a paid commercial license available by contacting STANDS4 directly.