"MCP servers that don't require API keys" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Run Python, Java, C, C++, C#, Go, Rust and 39 more languages, each run in a fresh, offline sandbox.
Linux microVM sandboxes for AI agents: run commands, files, processes, pause and wake.
Spin up a complete OpenCode development environment on any Linux box — one agent-driven workflow, six tools, zero secrets.
Code mode (preview): the AI writes a script against a typed foundry.* API and runs it in a sandbox.
Universal pay-per-call tool API for AI agents. Web search, price feeds, hive memory, LLM routing, code sandbox. Free tier (10 calls/day, no signup). x402 payments on Base + Solana.
Proves AI-generated Python does what you asked: lint, types, security, sandbox run, exact fixes.
Second opinion before an irreversible agent action; signed proofs, free verify, public ledger.
Low on memory? Your bot sends heavy jobs to cloud sandboxes on your own provider keys. Flat fee.
tasklite.net: hosted backend, REST API and admin for apps built by AI agents
Create and preview self-contained web apps in iPhone, Duo, iPad, or Headless views. Seven starter tools and games, browser-local code saving, and HTML export. Free; no API key. Tools: open_ipadian, preview_app. Interactive previews require MCP Apps support. Independent web simulator; no native iOS apps or cloud sync. Setup and Claude/Codex downloads: https://os.ipadian.net/plugin/
Hand routine JS/TS tasks to Codemind from your agent. $0.10 per verified build; failures are free.
Paid pre-execution risk verification for AI agents over MCP and x402.
40+ developer tools from Context7, Code Runner, Python Execute, NPM Sentinel, PlantUML, and Microsoft Learn. Docs lookup, code execution, security scanning. Starts at $0.01/call. Get your API key at app.xpay.sh or xpay.tools
Reasoning, code, anti-deception, memory harness MCP tools. Stdio or HTTPS api.ejentum.com/mcp
Execute code in 8 programming languages via gVisor-sandboxed Docker containers. Supports Python, JS, TS, Go, Java, C++, C, and Bash.
Anima MCP connects your AI coding assistant directly to Anima Playground. It bridges the gap between PM prototypes and production code.
MCP task execution sandbox. 4 tools for claim→execute→submit lifecycle with idempotent claims, duplicate-safe submissions, content validation, and 7-day execution expiry.
Persistent Linux microVMs for agents: root, internet, sub-second resume and a public URL.
Pay-per-call DNS/TLS truth and npm/PyPI breakage checks via x402. No account or API key.
US parcel, zoning, ordinance and permit data, with a Python sandbox to query and map it
