Add YC World ID guide

world-id/yc.mdx

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+---
+title: "World ID for YC Startups"
+description: "Simple ways to build trust into your startup with World ID."
+hidden: true
+hideFooterPagination: true
+---
+
+The World stack is a privacy-preserving trust layer for companies that need to know whether a real, unique, present, or eligible person is behind an action.
+
+## Start with the trust question you need to answer
+
+| Question | Use | What it helps you do |
+| --- | --- | --- |
+| Who can participate? | **World ID** | Prove a user is a real, unique human. |
+| Who is present right now? | **Selfie Check** | Confirm that a human is approving an important action. |
+| Who meets the requirements? | **Identity Check (Preview)** | Verify supported document-backed attributes—minimum age, nationality, document type, or issuing country—without collecting the underlying document. |
+| When can an agent act? | **AgentKit** | Let an AI agent act after the required human trust checks are satisfied. |
+
+## Why startups use World ID
+
+1. **Stop bots and duplicate accounts.** Make rewards, referrals, voting, reviews, promotions, and social participation one-person-one-action.
+2. **Protect sensitive moments.** Add human presence when someone approves a payment, recovers an account, deploys software, or authorizes a high-risk transaction.
+3. **Check eligibility privately.** Confirm that someone meets a policy without asking your product to store their full identity documents.
+4. **Match trust to risk.** Start with a lightweight check, then require stronger proof of humanity, presence, or eligibility where the stakes are higher.
+5. **Build safer AI products.** Distinguish people from agents and make human approval an explicit boundary for consequential actions.
+6. **Make communities more accountable.** Reduce impersonation, fake accounts, reputation manipulation, and fraudulent content while preserving privacy.
+
+## Where it fits in YC startups
+
+| If you're building... | The simplest place to use World ID |
+| --- | --- |
+| Proving you're human | Require one human per account to reduce Sybil attacks. |
+| An AI consumer product | Protect a free trial, referral, reward, or limited promotion from duplicate claims. |
+| Multiplayer AI | Distinguish verified people from AI agents in a shared environment. |
+| An operating system for the physical world | Make sure tasks are assigned to real, unique workers. |
+| A real-world data product | Limit data contribution and rewards to one unique contributor. |
+| AI-native compliance | Add a privacy-preserving proof that a user is a real human before a regulated or high-risk action. |
+| Crypto or stablecoins | Run fair allocations, grants, governance, airdrops, or incentives. |
+| Cloud tools for small software | Reduce fake workspaces, spam, and abuse before privileged access. |
+| Education | Protect scholarships, subsidized access, rewards, and student benefits. |
+| Products for the aging population | Reduce impersonation of patients, family members, and caregivers. |
+| Self-maintaining APIs | Add human accountability before critical code changes, merges, or deployments. |
+| Defense or physical infrastructure | Add a human trust signal to safety-critical operations. |
+
+## Keep the first use case simple
+
+Choose the one action where abuse would most change the outcome—such as creating an account, claiming a reward, receiving a referral benefit, voting, or accessing a scarce resource. Start there, then add stronger trust signals only when the risk calls for them.
+
+<Note>
+  World ID helps you know that a unique human can participate. Use Selfie Check when you need a signal that someone is present now, Identity Check (Preview) when you need to know whether they meet a supported requirement, and AgentKit when an agent needs to act on their behalf.
+</Note>
+
+## Ready to build?
+
+[Start integrating World ID](/world-id/idkit/integrate) to bring the right trust signal into your product.
+
+Not sure how to use World ID in your project? Email [mateo.sauton@toolsforhumanity.com](mailto:mateo.sauton@toolsforhumanity.com) and we'll help you build it.