"Information about Obsidian (note-taking app or volcanic glass)" matching MCP connectors:

Pay-per-call MCP tools via x402 USDC: ZAR prices, data extraction, Python sandbox, SA flights.

Scientific compute for AI agents: symbolic, numerical, quantum, chemistry, ODE. Paid via 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

Generate a Flutter app from a JSON spec free; pay only for the compiled APK (USDC on Base).

Pay-per-call DNS/TLS truth and npm/PyPI breakage checks via x402. No account or API key.

Reasoning, code, anti-deception, memory harness MCP tools. Stdio or HTTPS api.ejentum.com/mcp