Proof Launches x401, Giving AI Agents A Way to Prove Who They Represent - and What They're Authorized To Do

# Proof Launches x401, Giving AI Agents A Way to Prove Who They Represent - and What They're Authorized To Do

> Evidence tier: B2
> Evidence type: Proof first-party product announcement, discovered via Glenbrook
> Source: [Glenbrook Payments News](https://www.proof.com/blog/proof-launches-x401-giving-ai-agents-a-way-to-prove-who-they-represent---and-what-theyre-authorized-to-do)
> Published: 2026-10-15
> Captured: 2026-10-17T01:31:14.200Z

## Source summary

Proof says it launched an agent identity wallet, the open x401 protocol and a production MCP server. The wallet lets a person review and sign specific transaction terms on their own device; a receiving business can verify the signature, and changing signed terms such as amount or recipient invalidates it.

## Why it matters

The payment relevance is evidence of human authorisation, distinct from x402 payment execution. These are provider-described capabilities, not an independent security audit, universal adoption or a replacement for a bank’s own checks.

## Key numbers

No independently checkable key number was extracted from this report.

## Topics and entities

- Industry lane: Agentic payments
- Entities: Proof
- AI-native finance

## Evidence and credibility note

Use as a curated discovery layer; link to the underlying source whenever available. Automatically extracted metadata and material claims should be checked against the linked original before investment use.

Date evidence: Automatically verified from visible article date: October 15, 2026

## First-party corroboration

No directly corresponding A1 company announcement is currently linked.

## Original-source traceback

[Open the original Glenbrook Payments News report](https://www.proof.com/blog/proof-launches-x401-giving-ai-agents-a-way-to-prove-who-they-represent---and-what-theyre-authorized-to-do)

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This is a structured Payments Hot Markdown source summary derived from external reporting. Use the original link above to read the publisher's article; copyright remains with the original publisher.