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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. Previously Developer Relations at ZetaChain: events, docs, developer tools, Discord and moderation, office hours and live streams.

TypeScript Rust Python Ruby Solana React Native

By the Numbers
30+ MCP servers (AI tool bridges)
87 Published npm packages
70 Rust crates
5 Published books

Featured Projects

adyen-agent-ready — Agent-legibility audit of Adyen's developer surfaces: 17 findings, each with measured evidence, plus an MCP server for the Adyen TEST environment that fills the gaps.

openrouter-routing-lab — One workload, every OpenRouter routing lever, one table. Provider routing, fallbacks, ZDR, Auto Router, prompt caching — measured.

livekit-ops-mcp — MCP server that gives an AI agent operator control of a LiveKit deployment, plus a workshop kit that runs a hackathon room-by-room in one call.

universal-blockchain-mcp — MCP server for the ZetaChain CLI, so AI assistants can drive ZetaChain development tools.

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

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

What I Work On

  • MCP Servers — 30+ 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