Claude can now call APIs on its own. No LangChain glue code, no manual function-calling boilerplate, no prompt hacks to force structured output. The trick is wrapping your API as an MCP server, and once… The post How to Turn Any REST API Into an MCP Server for Claude (Complete 2026 Pillar Guide) appeared first on APILayer Blog - All About APIs: AI, ML, Finance, & More APIs .