About CheckToken

CheckToken is a professional, fast and free AI API token detection platform. Using a black-box approach, we run real checks on any API endpoint so developers can verify API Key validity, balance, model support and response speed before buying, integrating or relying on it.

Our founding team has spent years on AI API channel verification, with deep knowledge of the protocol details, signature mechanisms and channel fingerprints of OpenAI, Claude, Gemini, DeepSeek and more. Having seen too much impersonation, cheap substitution and signature forgery, we built CheckToken — not an armchair security tool, but detection capability forged in the real world.

• ✅ Professional & industry-leading: multi-dimensional black-box detection.
• ✅ Real detection: based on real requests, only verifiable conclusions.
• ✅ Privacy first: your API Key is used only for this check, never stored.
• ✅ Full coverage: OpenAI / Claude / Gemini / DeepSeek and more.
• ✅ Instant: paste and check, clear results.

CheckToken has completed thousands of real checks for AI developers, relay operators and teams. Whether you're an individual developer or a platform operator, verifiable results help you avoid pitfalls and make better API decisions.