Twitter/X

On 2026-06-26, Jeremy Allaire (@jerallaire) announced Circle's support for…

2026-06-26 · 22:39 UTC ·@jerallaire ·0 min read

Brief

Circle (Jeremy Allaire) announced on 2026-06-26 support for Proof's x401, an open protocol that verifies the authority behind AI agents' actions in the 'agentic economy.' Proof—working with payments, identity and AI contributors—positions x401 alongside x402 (payments); x401 has live demos and a CLI available from proof.com.

Why it matters

On 2026-06-26, Jeremy Allaire (@jerallaire) announced Circle's support for Proof's launch of x401, an open protocol to verify who authorized AI agents' actions in the so-called 'agentic economy'.

Key details

  • Proof positions x401 as answering 'who authorized the action' and pairs it with x402 (which answers 'how an agent pays'); Proof released live demos and a CLI for x401 available now.
  • Proof developed x401 with contributors across payments, identity, and AI, and Circle frames the announcement around the need for open standards for both payment and identity in the agentic economy.
Source evidence

We are supporting the launch of x401, an open protocol for verified identity in the agentic economy.

Circle (@circle)

The agentic economy needs open standards for both payment and identity.

Circle is proud to support @proof's launch of x401, an open protocol for verified identity in the agentic economy.

x402 answers how an agent pays. x401 answers who authorized the action.

proof.com/blog/identity-infr…

Link

Proof Launches x401, the Open Protocol for Verifying the Authority Behind AI Agents

Developed by Proof with contributors across payments, identity and AI, x401 lets any online service request proof of who authorized an agent’s actions. Live demos and a CLI are available today.
proof.com

— https://nitter.net/circle/status/2070533204348633399#m