Chinese Text Project vs Wordnik

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.

Wordnik's REST API returns word definitions aggregated from multiple published dictionaries alongside example sentences, pronunciations, related words, and corpus-derived frequency data, documented through an interactive Swagger UI. Every developer gets a free Basic plan (100 calls/hour, with an explicit nonprofit/research allowance) before paid Hobby, Pro, and Enterprise tiers raise the ceiling up to 45,000 calls/hour -- revenue that funds Wordnik's nonprofit mission to document the English language.