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ExpertVagabond/README.md

Hi, I'm Matthew Karsten

Founder, Purple Squirrel Media — Building AI x Web3 developer tools.

Full-stack engineer shipping autonomous agent tooling, MCP servers, and Solana infrastructure. Based in Annecy, France.

TypeScript Rust Python Ruby Solana React Native

By the Numbers
321 Open source repositories
25 MCP servers (AI tool bridges)
18 Published npm packages
12 Rust crates
5 Published books

Featured Projects

Coldstar — Air-gapped Solana cold wallet. Rust secure signer, FairScore risk engine, offline transaction signing. Colosseum Hackathon finalist.

cpanel-mcp — MCP server for cPanel/WHM hosting automation. 47 tools. Published on npm.

solana-mcp-server — Solana blockchain MCP server for AI assistants. Token management, DeFi operations, wallet tooling.

NorthCatch — Expo/React Native fishing app for iOS and Android.

Ordinals MCP — Bitcoin Ordinals server for AI assistants. 24 tools covering inscriptions, runes, BRC-20, and rare sats.

SolMail MCP — On-chain encrypted messaging for Solana via MCP.

What I Work On

  • MCP Servers — 25+ servers bridging AI assistants with blockchains, hosting, media, and dev tools
  • Solana Infrastructure — Cold wallets, token tooling, on-chain messaging
  • AI Agent Tooling — Autonomous coding orchestrators, content engines, local AI pipelines
  • CLI Tools — 14 production CLIs across Ruby, TypeScript, and Rust

Tech Stack

Languages    TypeScript  Rust  Python  Ruby  Go  JavaScript
Blockchain   Solana  Anchor  Bitcoin Ordinals  ZetaChain
AI/Agents    MCP Servers  Claude Code  Ollama  ChromaDB  LangChain
Mobile       Expo  React Native  EAS
Infra        Cloudflare Pages  Docker  GitHub Actions  cPanel

Links

purplesquirrelmedia.io ・ Twitter @expertvagabond ・ npm

If my tools are useful to you, consider sponsoring my work.

Pinned Loading

  1. raycast-mcp-server raycast-mcp-server Public

    Model Context Protocol server for Raycast — 9 tools for AI-native macOS workflow automation

    JavaScript 5 1

  2. solana-mcp-server solana-mcp-server Public

    Solana MCP server for wallet management, transactions, and program interactions

    JavaScript 1 1

  3. 8thwall-archive 8thwall-archive Public

    Archive of 11 legacy 8th Wall WebAR projects — SLAM, face tracking, image targets, VPS, portals

    TypeScript 1

  4. coldstar-agent-signer coldstar-agent-signer Public

    Policy-gated, air-gap-rooted signing for AI agents on Solana. Drop-in BaseWallet for Solana Agent Kit. The agent never holds the root key.

    TypeScript

  5. ExpertVagabond ExpertVagabond Public

    Profile README

  6. jupiter-mcp jupiter-mcp Public

    MCP server for Jupiter Developer Platform — 17 tools covering swap, tokens, price, lend, limit orders, DCA, prediction markets, perps, and portfolio

    TypeScript 2