Proof has announced the launch of x401, an open, issuer-neutral protocol designed to verify the identity and authorization behind AI agents before they take action. As AI agents increasingly perform high-impact tasks such as making purchases, signing agreements, building systems, publishing content, and moving money, the central challenge has shifted from capability to trust. The x401 protocol aims to address this gap by enabling any website or API to validate who authorized an agent and what actions it is permitted to perform.
As AI agents become capable of executing real-world actions such as processing payments, signing documents, and interacting with digital services, the need for reliable authorization frameworks has become critical. Proof positions x401 as a solution to the missing trust layer—ensuring that every agent action can be traced back to a verified identity and explicit authorization.
The protocol allows services to request proof of identity attributes such as verified human status, organizational affiliation, or delegated authority before granting access or executing actions.
x401 enables a structured exchange between AI agents and digital services. When an agent requests access, the service issues an authentication challenge specifying required credentials or claims. The agent then presents verifiable credentials issued by a trusted provider. The service validates the issuer, scope, and authorization before allowing the action to proceed.
This framework separates identity (who the agent represents) from authorization (what the agent is allowed to do), binding them into a verifiable proof layer.
The x401 protocol is designed to be open and interoperable, allowing any compliant issuer to generate credentials and any agent to present them. Services retain control over which identity providers and assurance levels they accept, ensuring flexibility across industries and regulatory environments.
This structure avoids dependency on a single identity provider, enabling broader adoption across digital ecosystems and AI platforms.
x401 is positioned as part of a broader emerging stack of agentic internet protocols. It complements payment authorization standards such as x402 and intent-based frameworks like AP2.
Together, these protocols aim to create a complete infrastructure layer where AI agents can securely identify themselves, execute payments, and carry out authorized actions across digital systems.
Proof also introduced its Digital ID system as an early implementation supporting x401 challenges. The system enables high-assurance identity verification, including biometric enrollment, selective disclosure, and zero-knowledge proofs.
This allows users and organizations to prove attributes such as age, nationality, or authorization status without exposing full identity data, enhancing privacy while maintaining security.
Beyond identity verification, Proof’s platform supports cryptographically signed transactions, linking verified identities to specific actions. This creates a verifiable audit trail for both human and agent-driven operations, strengthening accountability in AI-enabled workflows.
The system is designed to support regulated environments by ensuring that every action taken by an AI agent can be traced back to a validated and authorized source.
The launch of x401 reflects a broader shift toward establishing trust infrastructure for the growing ecosystem of autonomous AI agents. As enterprises increasingly delegate tasks to AI systems, ensuring secure authorization and identity verification becomes essential for adoption at scale.
By combining identity verification, authorization controls, and cryptographic proof mechanisms, x401 aims to provide a foundational layer for secure agent-driven digital ecosystems.
About Proof
Proof is the identity authorization company that verifies people and organizations, issues high-assurance cryptographic credentials and creates tamper-evident evidence of what they authorize—whether they act directly or through AI agents. Proof has secured more than $640 billion in transactions for 10,000 organizations, including 16 of the Fortune 100. Learn more at proof.com.
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