Phosphor Capital

Phosphor Capital invests in the top founders in each Y Combinator batch. Typical check size is $100k - $500k.

[Pete Koomen @koomen]

For more than a year we've been building tools at YC to make it easier to use agents at work. I enjoyed speaking publicly about this for the first time with the Lightcone crew!

[Phosphor Capital @phosphorcap]

@nico_laqua Incredibly journey so far.
excited for what's next.
let's go!

[Phosphor Capital @phosphorcap]

@coffeewithone congrats on the launch!

[Coffee with One 🇺🇸 @coffeewithone]

Octolane started by watching my mom.

Single mom. Four sons. Seven days a week. No CRM. But she remembered every customer and every promise.

I was Mintlify's first intern working in SF. One day I looked at the Salesforce tower and thought: my mom didn't need a CRM. What if no one did?

Dropped out of Duke. Started Octolane with my best friend @halim__rafi and a team of 5, engineers twice our age who left real jobs to bet on us. Working from coffee shop to coffee shop, 7 days a week, spending as little as possible.

Today, after onboarding 1,000+ companies manually, @octolane - The Self-driving AI CRM is generally available.

You talk to Octolane like a co-founder. It figures things out and does the work end to end. Because the best CRM is no CRM.

→ 10,000+ action types - the largest action library in any CRM
→ 200+ integrations + MCP server (works inside Claude, Cursor, ChatGPT)
→ Multi-agent system: agents talk to each other to run your pipeline
→ Self-improving sales playbook that compounds with every deal

Give it a shot today. Break the product. Let us know.

My number: 628-285-1600. Text me for a launch-day coupon. First 20 calls, I'll onboard you myself.

🌉 Built in San Francisco | Thanks to @ycombinator

[Alberto Rosas @albertorosasg]

We just raised $7.5M to build the infrastructure for identity and fraud.

The round is backed by @ycombinator, Orange Collective, Rebel Fund, Pioneer Fund, and other incredible VCs and angels.

AI is making fraud incredibly cheap to create: fake identities, fake businesses, fake transactions, all generated at internet scale. We believe every app will soon need trust infrastructure the same way apps today rely on payments or cloud hosting.

The future of the internet is verified. Didit (@getdidit) is building it.

[Phosphor Capital @phosphorcap]

@albertorosasg @ycombinator great round!
congrats!

[Philip Johnston @PhilipJohnston]

Yooooo… I made it to first few pages of the @SpaceX S1! 😲🙏🫡

[Garry Tan @garrytan]

Attention is the rarest and purest form of generosity. —Simone Weil

[Garry Tan @garrytan]

We are living through the Apple II moment for AI, and people reading this will be some of the people who create the personal AI for billions of people for decades from now.

I want to be one of them. I want you to be one of them with me!

[Harj Taggar @harjtaggar]

Search for agents is not the same thing as search for humans. Agents make *a lot* more searches and they care only about getting the right information. Exa understood this first (2022), built the best product, and is now the clear leader. This is going to be a huge company.

[Y Combinator @ycombinator]

In a recent batch talk, YC General Partner @t_blom broke down how to build a self-improving, AI-native company.

He walks through how to create recursive, self-improving AI loops, and why founders who get this right will run companies that improve while they sleep.

00:00 — Companies Are Roman Legions
00:54 — Copilots Are the Wrong Mental Model
01:55 — Extract the Domain Knowledge
02:24 — The Recursive Self-Improving Loop
04:12 — The Holy Shit Moment at YC
05:50 — Self-Optimizing Product and Support Loops
06:29 — Burn Tokens, Not Headcount
07:23 — Middle Management Is Over
08:05 — Make Everything Legible to AI
09:40 — Regenerating the YC User Manual
11:19 — Software Is Ephemeral, Context Is Valuable
12:18 — Where Humans Still Matter

[Dasha @dasha_shunina]

The best founders don’t pitch. They make you feel like the future is already happening and you’re late.

[Garry Tan @garrytan]

There is a transition here for people across the workforce: the working world needs fewer measurers and more builders

More revenue means there will be more activity and more building, and in the shorter term less measuring

[Sarah Br @unbylined_]

Claude has tried to end my workday 3x today.
Told me it was "defaulting to wind-down framing."
It's 1pm. On a Monday.

[Caitlin Leksana @0xCaitlin]

WE RAISED OUR SERIES A!!! 🎉 🚀

Today, we’re thrilled to announce our Series A, bringing @FazeshiftHQs total funding to $22M.

Accounts receivable is still one of the most manual, painful workflows inside modern companies. It lives in spreadsheets, email threads, and disconnected systems – and it slows down how businesses get paid.

That’s exactly why we built Fazeshift: an AI-native platform that automates and scales AR, helping finance teams move faster, operate with clarity, and unlock cash flow.

Since we kicked things off in 2024, the team has executed relentlessly:
✔️ 12x revenue growth
✔️ 8 unicorns now using Fazeshift
✔️ Team grew from 2 → 26
✔️ Opened our SF HQ and NYC office

This milestone is a reflection of the people behind it, and it gives us the ability to invest more aggressively in our AI agent’s capabilities.

To our investors, thank you for your belief and partnership. This financing ranks well above the typical Series A, reflecting strong investor conviction in the shift toward AI-native finance infrastructure.

F-Prime, @GradientVC , @ycombinator, @0xpioneer_fund, Phoenix Fund, Wayfinder, @RitualVC , @2048vc , The Graduate Syndicate, Vulcan Partners, and incredible angels including Sandor Palfy, Kulveer Taggar, Richard Aberman, Terrence Rohan, Rob Biederman, Mike MacCombie.

To our customers, thank you for trusting us with something so critical. You’re trusting us with how your business gets paid, and we don’t take that lightly.

And to @0xTimmyG and our team, it’s an absolute privilege to build alongside you.

We’re just getting started. This raise isn’t the finish line, it’s fuel.

Let’s go do this thing!

Read the full story from @bayareawriter in @crunchbase (link in comments).

[Adit @aditabrm]

The DoD dumped decades worth of UFO reports. We parsed and open sourced all of the documents

Have fun 👽

[Garry Tan @garrytan]

It's happened. My OpenClaw and Hermes Agent are now chatting with one another.

The cyberpunk future is here, but hopefully it's a whitepill instead of a blackpill. Let's try to push it to the former.

[Phosphor Capital @phosphorcap]

@JonMSchwartz so cool!

[Filip Kozera @kozerafilip]

Proactive agent that thinks and acts like you.
Multiplayer AI Brain for teams.
Proper GUI for commanding 50 agents.

https://t.co/zsDxICHezv is all three. Sauna goes live today. First 2000 people, use access code LAUNCH for $80 of weekly(!) credits.

Let’s explain. Multiplayer only works once the personal brain is powerful. So let's start here.

Personal AI Brain
3,800+ tools connected. State of the Art memory. Skills and schedules you teach once that get repeated forever on cheaper models. An AI first CRM.

Lives on the cloud so you can initiate tasks from anywhere: iMessage, Slack, Email. Also no need for a Mac mini 😉

GUI
AI agents have been stuck in their MS-DOS era. A chat box, a scroll buffer, no way to command 50 of them. We built the first GUI: Live sessions on one side, work waiting for your sign-off on the other, plus the things Sauna kicked off while you were asleep waiting for review. Game mode helps clear the queue with actual joy.

Okay so far so good, but how to give benefit of what you built to more people or whole team?

Multiplayer
Once your Sauna actually knows you and you gave her access to your tools, you can use multiplayer.

Two modes:
- Brain access. My co-founder Robert plugged my brain as a tool into his Sauna last month. He can ask it about pricing while I'm in other meetings, gets a sourced answer back, never has to interrupt me. That’s read only. Yolo mode gives him access to all my tools too :O
- Communal Saunas extend that to whole companies with proper permissioning. Folder owners decide what's true for the whole company and build skills. Most get their personal brain + read access to communal files and memories. Works also for group planning my best friend's bachelor party.

The Way
I’ve been obsessed about AI Brain since 2016. Our human brains suck at some things like memory and are brilliant at others like creativity. We are also particularly bad at thinking we are all on the same page and then realising weeks later that we weren’t. Most leaders spend their days being the human diff tool, catching contradictions in hallway conversations and Slack threads. Repeating themselves 50 times. Now every company is spinning up hundreds or thousands of agents that drift faster than humans do, feeding each other their drift as context. Compounding rot.

After 10 years and one failed company in this space we are launching the solution.

The Launch
We thought about a celebrity launch. Margot Robbie in a bathtub explaining agents. But then we realised the same money gives the first 2,000 people free daily credits, every day, until we burn through that $1,000,000.

Sauna runs Claude, GPT-5, Gemini, GLM-5.1, DeepSeek, Kimi so you can budget yourself. The labs are racing to lock you so they can milk you in a year. We picked your side.

Onboarding
It’s live at https://t.co/8ekc1ZtzoJ We’ve preheated saunas based on a niche. Use the access codes in the comments to get a better experience.

[Sarah Br @unbylined_]

Moved from @Lovable to Claude Code
Once I stopped thinking about tokens, I got more done.

Pricing that makes users count every action slows adoption.