Fact Check Tools
what fact-checkers published.
Finds fact checks that news and fact-checking organisations published about a claim, through Google's Fact Check Tools API.
01What it does
The claim check first lets the language model pick out at most three checkable claims from the text. For each claim the server searches published fact checks in the check's language and keeps at most five reviews that are really about the same claim (a review counts only when most of the claim's key words appear in it, so a loosely matching review is dropped rather than shown). Each kept review is one finding with the publisher's name, its rating in the publisher's own words and a link to the article:
| Publisher's rating | Finding |
|---|---|
| False, Mostly false, Pants on Fire, Fake, Altered, Nepravda and similar | "Rated false by a fact-checker" (Danger) |
| Partly false, Missing context, Mostly true, Zavádzajúce / Zavádějící and similar | "Rated partly false or misleading by a fact-checker" (Caution) |
| True, Pravda (only a publisher's top rating) | "Rated true by a fact-checker" (OK) |
| Any wording not in the rating tables | "Reviewed by a fact-checker" (Caution); nothing is guessed |
A claim a fact-checker rated false, and none rated true, gives the truth answer "Rated false by fact-checkers". The rating tables are in server/src/lens/ratings/en.json, sk.json and cs.json, each with its source page; extend them for the publishers your users read.
Coverage depends on what fact-checkers publish in each language. Only Demagog's four ratings are mapped for Slovak and Czech; other Slovak and Czech wordings show as "Reviewed by a fact-checker".
02Get a key
- Open the Google Cloud console and pick your project.
- Enable the Fact Check Tools API under APIs and services, Library.
- Create an API key under Credentials and restrict it to that API.
03Switch it on
- Console, Published fact checks: turn on Use Fact Check Tools and paste the API key.
- Press Test connection. It runs one fixed English search.
Claims are found by the language model, so the claim check also needs the Language model. Without it, the app lists "Claim extraction: not configured" and the claim unit is given back.
04Cost and terms
Google publishes no price for this API as of 11 November 2026; quotas apply. Read the API's page, its quotas and terms at developers.google.com/fact-check/tools/api before you launch. Each finding links to the publisher's own review.