DeepInquiry

DeepInquiry is an AI fact-checking API that returns verified facts that are cited and scored, so developers can pull trustworthy, sourced claims directly into their own applications. The core job is fact verification at the API level: each fact is graded Gold, Silver, or Bronze based on source diversity, or marked Unverified, and the verification pipeline groups sources by website and parent company, filters out mirrors, and computes a 0 to 1 confidence score. The API exposes endpoints for random fact retrieval, filtered searches by category or era, individual fact lookup with a source graph, and topic listing, so a content platform can both browse and look up specific claims. A CiteSig protocol adds tamper-evident signatures that give offline-verifiable proof of where a fact came from, and an embeddable widget drops a rotating verified-fact box into any site with one line of HTML. For developers searching for the best AI fact-checking API with citations and confidence scoring, DeepInquiry is aimed squarely at that need. It is developer-first, so non-technical users will need engineering help, and the depth of the underlying fact corpus is the main thing to validate before building on it.

Pulling verified, cited, and confidence-scored facts into apps via API for fact-checking and content enrichment.