# AiCitationChecker > Academic citation verification API. Detects AI-hallucinated bibliographic references by checking them against CrossRef, Semantic Scholar, and OpenAlex. AiCitationChecker accepts a list of academic references in any citation style and returns a per-reference verification result: whether the paper exists, whether the metadata is correct, and a corrected formatted citation when a real match is found. Suitable for integration into research assistants, writing tools, and document pipelines. ## Docs - [For AI Agents](https://aicitationchecker.org/agents): What the service does, when to use it, access model, and payment — no implementation detail. - [API Documentation](https://aicitationchecker.org/docs): Full endpoint reference, request/response format, status codes, confidence levels, and code examples. ## Access Account registration: https://aicitationchecker.org/login Free tier available — no credit card required, includes API access.