> For the complete documentation index, see [llms.txt](https://docs.zetrix.com/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.zetrix.com/en/developer-resources/agentic-wallet/motivation/two-gaps-in-the-agentic-web.md).

# Two gaps in the agentic web

Autonomous agents now transact on behalf of humans and organizations. Two questions must be answerable at the HTTP boundary, per request, without a human in the loop:

* **Can you pay?**, solved by **x402** (402 Payment Required).
* **Are you allowed to do this, and who stands behind you?**, the gap **x401** closes (401 Unauthorized).

The second gap is sharper in an AI-saturated environment. Deepfakes and synthetic media have made traditional "is there a human?" authentication cheap to bypass, and agentic traffic already exceeds human web traffic. x401 answers this with **deterministic cryptographic verification** rather than probabilistic heuristics: a presentation either validates against a trusted issuer's keys or it does not.