Wikisource is the Wikimedia Foundation's free library of source texts — public-domain and freely-licensed books, historical documents, legal texts, constitutions, speeches, and other transcribed primary-source works in over 70 languages.

• MediaWiki Action API — https://en.wikisource.org/w/api.php — full read/write access via action= dispatch; JSON preferred.
• MediaWiki Core REST API — https://en.wikisource.org/w/rest.php/v1 — page CRUD, search, history, transforms.
• Wikimedia REST API v1 — https://en.wikisource.org/api/rest_v1 — cached reads at up to 200 RPS; page summaries and HTML.

• Website: https://wikisource.org
• English edition: https://en.wikisource.org
• API documentation: https://www.mediawiki.org/wiki/API:Main_page
• API usage guidelines: https://foundation.wikimedia.org/wiki/Policy:Wikimedia_Foundation_API_Usage_Guidelines
• Bulk dumps: https://dumps.wikimedia.org/
• Status: https://www.wikimediastatus.net/

All requests must include a contactable User-Agent header. Read access requires no API key. Write access requires a free OAuth 2.0 account via meta.wikimedia.org. Requests should be serial rather than parallel.

Kin Lane — kin@apievangelist.com