Fact verification API

Before your AI hallucinates,Factagora verifies.

Ground your AI in verified facts, evidence, and causal reasoning. One API layer on top of any LLM, vector DB, or RAG stack.

Trusted by forward-thinking teams

The API

One key, three endpoints.

Bearer auth, structured JSON responses, OpenAPI spec included. Works with any language and framework.

Search verified sources and get ranked, cited results for any query.

Verify any claim against original sources with a confidence verdict.

Surface supporting and opposing evidence, ranked by strength.

How it works

One call returns a confidence-scored verdict, with the exact sources behind it, ready to ground your output.

Where it fits

No migration, no retraining. Factagora sits between your application and the stack you already run, and adds verification in a single call.

Grounded answerSources + confidence score

Case Study

Korea's top 5 law firm transformed their legal research with Factagora. Over 350,000 documents restructured into verifiable FactBlocks.

Shin & Kim LLC

Top 5 Law Firm in Korea

Case Study

“Factagora demonstrated lawyer-like logic, saving our lawyers time while enhancing trust in our AI services.”

Junkyu Ahn

Lawyer at Shin & Kim LLC

Get Started

APIs purpose-built for factual verification. Start free in the Playground. No credit card required.

Supported by Leading Global Programs