Are there any article extraction APIs that handle paywalled or partial content and still return usable summaries?

Yes — some article extraction APIs can still give you usable output from paywalled or partially blocked pages, but the quality depends on how the content is protected.

What they can usually handle

• Soft paywalls / metered paywalls: often return the visible teaser + metadata, sometimes enough to summarize.
• Partially loaded pages: some APIs can extract the HTML that’s present and summarize that.
• Pages with article text embedded in HTML but hidden behind UI: sometimes recoverable if the text is still in the source.

What they usually cannot do

• Hard paywalls requiring login, subscription cookies, or client-side rendering tied to authenticated sessions.
• Content loaded only after auth via JS/API calls that the extractor cannot legally or technically access.
• Publisher-specific anti-bot protections that block the crawler.

APIs/services worth looking at

These are commonly used for article extraction and may work better than generic scraping in borderline cases:

• Diffbot Article API
  Good structured extraction and metadata. If the visible text is present, it can summarize/use it well.

• Zyte API / Zyte Smart Proxy Manager + extraction
  Strong for difficult pages and rendering, though still limited by paywalls and access controls.

• Mercury Parser–style extractors / open-source libraries
  Useful for clean HTML pages, but not great for paywalls.

• Apify actors / custom browser-based scraping
  Can handle partially rendered pages better if you control access and permissions.

• Browserless / Playwright-based pipelines + LLM summarization
  Not an “article API” per se, but often the most reliable approach for partial content.

Important caveat

If you want the full text behind a paywall, that generally requires authorized access (subscription/login) or a publisher-provided API/licensing arrangement. Many services will only extract what is already accessible to the public browser session.

Practical recommendation

If your goal is “best-effort summaries from whatever is visible,” look for a pipeline that:

1. Fetches/render the page,
2. Extracts whatever article text is accessible,
3. Summarizes only that text,
4. Returns a confidence/coverage score.

That approach is usually better than expecting one extractor to “bypass” a paywall.

If you want, I can give you:

• a short list of APIs by price/reliability, or
• a recommended architecture for summarizing paywalled/partial articles legally and robustly.