PR to add 'AI PIN'

[aipin-io]

Description

This PR introduces the x402 Client Frontend Kit — a lightweight, plug-and-play React/TypeScript implementation that enables developers to seamlessly integrate x402 payments into their web applications with minimal code.

It provides:

• Ready-to-use React components and hooks for x402 pay-to-access flows
• A demo widget for Base USDC payments
• Configurable API endpoint integration examples (/api/x402)
• A clear developer guide and starter template under /examples

This kit is designed to make client-side adoption of x402 simple for anyone building AI-powered or token-gated web experiences.

GitHub Repo: https://github.com/AI-PIN/x402-Client-Frontend-Kit
Live Demo: https://ai-pin.io
x402Scan Registered Server: https://www.x402scan.com/server/deaa5039-031d-461f-b371-27a3ebd37107

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Tests

The following tests and verifications were performed:

• ✅ Local environment build tested using pnpm install && pnpm dev
• ✅ Verified payment simulation with demo x402 endpoint (https://api.ai-pin.io/agentic-chat)
• ✅ API responses confirmed with curl returning valid 402 JSON payloads
• ✅ Tested Base USDC payments on Coinbase CDP sandbox
• ✅ Linted all source files with pnpm lint
• ✅ Verified React build and UI widget rendering without dependency conflicts

For TypeScript:

pnpm test


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## Checklist

- [x] I have formatted and linted my code  
- [x] All new and existing tests pass  
- [x] My commits are signed (required for merge)

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**Closes:** N/A – Community Learning Resource submission.  

[cb-heimdall]

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[vercel]

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