Multifactor (YC F25)

Multifactor.com is the future of secure online account sharing. Use “Checkpoint links” to share access without exposing credentials. Grant “read-only” access to humans and AI. Easily import accounts from LastPass, Apple, or Google. Soon, let AI agents log in and take action with your permission.

We share our offices with @MultifactorCOM, one of the best AI agent security companies out of YC. Our claude has context that we do this. So, when asked, Opus 4.6 created this video for Multifactor. Passwords are so last epoch with Multifactor.

Multifactor is hiring an Engineering Lead! Major companies like Cloudflare, Browserbase, Vercel, and Firecrawl have called agent auth one of their biggest unsolved problems. Multifactor has a validated and differentiated solution, and we need your help to ship it faster. Apply now: ycombinator.com/companies/mult…

Congratulations to Multifactor on the $15m seed round straight out of YC's fall batch. This was one of our earliest and fastest investments in F25 at @pioneer_fund. Outlier founders. They're making it possible for AI agents to operate accounts securely.

We're proud to be leading $15M seed round into @MultifactorCOM, to make online accounts fundamentally safe for the age of AI agents. Securely connecting our accounts to AI tools, while keeping users in control, is the need of the hour. As AI agents become part of how we collaborate, the need for mathematically provable identity foundations has never been clearer. Multifactor is building exactly that - a secure way for humans and AI to share access without exposing credentials. Vivek and @Autoparallel - Thanks for picking @NexusVP as your partner! Excited to be on this journey with you, along with an incredible group of supporters and advisors, including @Padmasree, @gokulr, @collinmathilde, @auren, @ycombinator, @dessaigne, @Liquid2V, and more. As Vivek mentions in his post: Identity should be our strongest defense, not our biggest vulnerability. Onward! See @eringriffith's feature of Multifactor in today's @nytimes article: nytimes.com/2025/12/04/tec… #AI #Identity #Security

A.I. Deal Making Is Getting Faster and Faster nytimes.com/2025/12/04/tec…

Learn more and join us on our mission to redefine the agentic web: multifactor.com/blog/multifact…

Excited to share that Multifactor has raised $15M led by @NexusVP to make online accounts safe for AI agents and humans. Thank you to our investors, advisors and early users!

@dasha_shunina @ycombinator @Forbes @getdomeapi @kurushdubash @peggy_wang @digipals_app @wen_rahme @tobiasherber @MetorialAi @conor_ai @aryansawhney17 @erikvank05 @v_c776 @JuliAndreeaH Thank you so much for the recognition, @dasha_shunina! We're honored to be one of your top pics.

Want a sneak peek into the @ycombinator F25 batch? Check my latest article for @Forbes. You won’t be disappointed. @getdomeapi @kurushdubash @peggy_wang @digipals_app @wen_rahme @tobiasherber @MetorialAi @conor_ai @aryansawhney17 @erikvank05 @v_c776 @JuliAndreeaH @byAmirHanna @MultifactorCOM @janaksunil @usebearai forbes.com/sites/dariashu…

@ycombinator @MultifactorCOM Sharing logins with AI used to sound like giving your house keys to a raccoon. Multifactor turns that chaos into security art. It’s zero-trust with 100 percent confidence. Now even your AI can knock politely before entering your accounts.

Multifactor (@MultifactorCOM) is building the future of zero-trust authentication, authorization, and auditing for AI agents. Their platform lets users securely and revocably share any online account with humans and AI agents alike, just by sending a link.

These mad lads are so confident in their product security that they put their actual bank account details on Times Square! 🤯

The Multifactor Challenge is live! Anyone with Multifactor can now use our Checkpoint link to log into our business checking account on Meow, where we’ve stashed $1 million in VC funding. Every dollar we’ve received from YC is in there, but we’re not worried. Our Checkpoint account-sharing system has disabled transfers and withdrawals, and our credentials are protected by Multifactor’s post-quantum-secure encryption. If the laws of math don’t fail us, our funding will be just fine. Check out the video below for the link, and be sure to follow us here for live updates.

Securely sharing any online account with AI agents. Can your password manager do that?

One-click logins to any site, on any device. Can your password manager do that?

Instantly revoke shared accounts, without having to change your passwords. Can your password manager do that?

Sharing accounts just by sending a link, *without* ever actually sharing the passwords. Can your password manager do that?

Watch this space! One week from today, we'll be putting Multifactor through the ultimate stress test. We're going to publish a link that lets *anyone* log in to our company's primary business checking account. $1M of funding — basically every dollar we have raised — will be on the line. But standing between us and disaster will be Checkpoint, our secure link-based account sharing system! Will someone try to take the money? No doubt. Will they succeed? The math says no way—and so do we. Stay tuned for more details.

We are incredibly grateful for (and overwhelmed by) the surge of recent interest in Multifactor! In the past 48 hours, hundreds of new users have signed up for Multifactor and propelled us to a #1 spot on @ProductHunt, even on a day with four YC launches. Your support and feedback mean the world to us as we continue to refine the product. Onwards and upwards! 🚀