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Versine
Versine

Versine

Versine provides autonomous authentication so AI agents can sign users up and log them in with consent.

HQ
San Francisco, CA, US
Accelerator
Y Combinator logoY CombinatorFall 2026
Overview
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Employees
Library

Versine builds authentication infrastructure that lets AI agents sign users up and log them into third-party platforms autonomously. Platforms add an agent-recognizable sign-in path that issues a short-lived code and completes the handshake over browser or MCP flows, while continuing to use their existing OpenID Connect identity providers and authorization rules.

The company is backed by Y Combinator in the Fall 2026 batch. Public product materials position Versine as the auth layer that restores agent autonomy at the login screen without replacing the host platform's session and permission model.

Versine - Products & Services

  • Versine Agent Sign-In logo

    Versine Agent Sign-In

    Versine lets platforms authenticate AI agents acting under a user's delegated permission at sign-in.

    Competing Products

    Baselayer logo

Versine - Similar Companies

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baselayer.com

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alterauth.com

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multifactor.com

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agenticfabriq.com

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theagentic.ai

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Verdex logo

Verdex

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Versine - Quick Facts

Who are Versine's competitors?

Companies similar to Versine include Baselayer, Arcade, Alter and Inkbox.

Where is Versine's headquarters located?

Versine's headquarters is located in San Francisco, CA, US.

Versine - Classification

Industry
  • Artificial Intelligence
  • B2B
Model
  • Agentic AI
Tags
  • AI Agents
  • Artificial Intelligence
  • Identity