The verifiable identity protocol for the agentic internet. Created by @proof with help from leading AI, payment, and identity companies.

World wide
Joined April 2026
x401 retweeted
Boom. @x401ID is live with the first production implementation launched by Superfluid. Agentic auth is the hot topic and @proof + @x401ID are the rails to solve it. Superfluid is the first of many. Stay tuned.
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x401 retweeted
Fantastic to see x402 go mainstream. We at @proof are obviously trying to learn all we can with @x401ID and a similar approach for identity. Kudos to @eastdakota and the @Cloudflare team for bringing the agentic web to life - and to all the original creators of x402. Following in your footsteps with identity.
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agentic identity should be open, auditable, and consumable. bullish x401
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…
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AI Agents will increasingly perform actions for people. They will buy products, access services, complete transactions, and interact with other machines. That raises a basic question: How does a system know whether to trust an AI agent. Today, to solve this, @proof launches x401, the open protocol for the agentic internet in collaboration with identity leaders at @OpenAI, @Google, @circle, @okta, Mattr, @lightspark, and more. Here @csuwildcat goes into what it all means with me. Available now at x401.id
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x401 retweeted
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…
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x401 retweeted
Your AI agent can already find you a better interest rate, insurance policy, or investment. It just can’t close the deal. Introducing x401, the open identity protocol built to change that: hubs.la/Q04mCTBJ0
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📢 Meet x401: The HTTP-native identity exchange protocol for the agentic Web There was no way for people to use their identity with agents, so I started tinkering, and w/ contributions from folks at Google, OpenAI, Okta, Circle, and more, we now have one: proof.com/blog/introducing-x…
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x401 retweeted
Agents will soon book travel, refill prescriptions, trade stocks, open accounts, pay, and so much more. With x401, sites can require verified identity and unlock countless use cases. With @proof they can be certain of who is behind the agent and what was authorized.
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x401 retweeted
Today's a big one. @proof launches x401, the open protocol for the agentic internet in collaboration with identity leaders across the web. Proof of who is behind every agent and what they've authorized. x401.id
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Hello world!
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