GitHub has since detected and contained a compromise of an employee device involving a poisoned VS Code extension.

GitHub has removed the malicious extension version, isolated the endpoint, and began incident response immediately, according to their claims.

Their current assessment is that the activity involved exfiltration of GitHub-internal repositories only. The attacker’s current claims of ~3,800 repositories are directionally consistent with their investigation so far. They have moved quickly to reduce risk. Critical secrets were rotated yesterday and overnight with the highest-impact credentials prioritized first.

GitHub continues to analyze logs, validate secret rotation, and monitor for any follow-on activity. They have said that they will take additional action as the investigation warrants. They will publish a fuller report once the investigation is complete.

Source: GitHub

Building a niche marketplace sounds exciting — until you realize it's twice as hard as a regular business. You're not just selling to one group. You're convincing two groups to trust each other, through you.

Most teams get it wrong from day one. Here's how to get it right.

🎯 Start Narrow, Not Broad

The biggest mistake? Targeting everyone.

Pick one painful workflow for one precise audience. Your wedge should be narrow enough to produce repeatable matches — and clear enough that users self-qualify immediately.

Ask yourself three questions:

Is this problem frequent enough to drive recurring engagement?

Are people already spending money solving it poorly?

Can you explain your advantage in one sentence?

If you can't answer all three with a yes, keep narrowing.

🔁 Treat Supply and Demand as Two Separate Systems

One blended landing page won't cut it. Suppliers and buyers have different fears, different motivations, and different reasons to bail.

Suppliers want to know: Will I get quality leads? Will I get paid fairly?

Buyers want to know: Can I trust what I'm getting? Is this reliable?

Build separate onboarding flows, separate messaging, and separate conversion paths. The signal you collect will be cleaner — and your conversion rates will thank you.

🛡️ Build Trust Infrastructure Before You Drive Traffic

Trust isn't a feature you add later. It's the foundation.

Before spending on acquisition, make sure you have:

Clear identity and profile verification

Transparent fees and payout rules

Visible reviews and feedback logic

A dispute resolution process that actually works

Teams that skip this discover the problem at the worst possible moment — when something goes wrong in front of real users.

📊 Watch the Right Metrics

Traffic and signups are vanity. Here's what actually matters in your first quarter:

Side-specific activation rates — are suppliers and buyers completing onboarding?

First-transaction conversion — are people actually transacting?

Time to first match — how long before value is delivered?

Repeat behavior — do they come back?

Dispute rate — how often does something go wrong?

If your growth metrics look good but these don't, you're building on sand.

📅 A Simple 30-Day Plan

Week 1 — Lock your wedge. Define value statements for each side. Set baseline metrics.

Week 2 — Launch separate landing pages for suppliers and buyers with clear trust signals.

Week 3 — Run controlled acquisition tests. Watch first-transaction behavior closely.

Week 4 — Fix bottlenecks. Update onboarding copy. Document what changed and why.

Simple. Focused. Evidence-based.

💡 Final Thought

A niche marketplace isn't a launch event — it's an operating system. The teams that win are the ones who stay disciplined: narrow focus first, trust infrastructure always, and expansion only after the core loop is proven.

For a deeper dive into the full five-stage framework (including monetization models, liquidity design, and a 90-day expansion plan), check out this excellent breakdown: Niche Marketplace Strategy in 2026 — Unicorn Platform Blog

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This is similar to when Yuri Milner offered to invest in every startup back when Sam was a YC partner.

The deal gives fledgling AI startups guaranteed compute resources and significantly extends their runway by covering heavy API costs.

Some in the community have warned that taking these tokens could be risky. Because OpenAI will get a clear look at how the startups use the tokens, some fear the platform could copy promising ideas and integrate them into its own free or native offerings.

Source: Sam Altman

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Anthropic announced Monday it has acquired Stainless, a startup founded by former Stripe engineer Alex Rattray whose software is widely used by rival AI labs, including OpenAI and Google.

Anthropic is gradually winding down Stainless’s general-purpose, hosted services. The startup's engine that automatically creates and updates SDKs will no longer be available to the wider market.

Existing clients will retain full rights and access to the SDKs they have already generated, allowing them to modify and maintain them.

The New York-based startup, founded in 2022, rose to prominence in the emerging AI industry for automating the creation and maintenance of software development kits, or SDKs; the libraries developers use to interact with APIs.

Source: Stainless