Show HN: MCP Gateway – Turn existing APIs and databases into MCP servers

MCP Gateway launches a platform that converts existing APIs and databases into MCP servers, allowing developers to import OpenAPI specs or connect PostgreSQL and SQL Server scopes, generate MCP tools, and publish them with server-side auth, validation, and logging. The service aims to simplify AI agent integration by eliminating the need for custom MCP adapters.

OpenAPI to MCP Import a Swagger/OpenAPI spec, generate MCP tools, edit descriptions for AI agents, and publish selected operations. Explore API publishing /openapi-to-mcp Import a Swagger/OpenAPI spec or connect a PostgreSQL or SQL Server scope, generate MCP tools, edit descriptions for agent behavior, and test the result instantly in Gateway Chat. The Gateway keeps auth, validation, limits, and logs server-side. Step 1 Paste the OpenAPI URL, add upstream auth, and let the Gateway discover operations. OpenAPI URL https://demoapi.../swagger.json Base URL /api/v1 Auth Bearer Token Detected 18 operations ready for review Gateway output MCP surface created MCP URL /mcp/service-ops Credentials stay server-side. Step 2 Pick which operations agents can see and rewrite descriptions so tool choice is obvious. Generated tools search orders create ticket get customer status Selected tool search orders Agent-ready description Search approved orders by customer, status, or date range before support actions. Only published tools appear in MCP clients. Gateway Chat Ask a real question. Chat selects the published MCP tool and shows the call. Which open Acme orders need support follow-up? I will call the published order tool and summarize the result. search orders succeeded · 284ms3 open orders found. 1 delayed shipment needs follow-up. Step 4 After tool calls run, usage shows call volume, success rate, latency, and redacted logs. Total Calls 1,248 Success 98.7% Avg Latency 284ms Last 24h 312 Call Volume Tool Analytics request arguments redacted · response stored What you can publish Generate a useful MCP catalog, curate what agents can see, and keep execution controls in the Gateway. Import a Swagger/OpenAPI spec, generate MCP tools, edit descriptions for AI agents, and publish selected operations. Publish PostgreSQL or SQL Server scopes as metadata-only schema tools plus validated QueryPlan or SQL executors. Keep credentials, validation, limits, quotas, and redacted logs in the Gateway instead of prompts or local client config. Create a safe MCP surface without hand-written adapters Start with a Swagger/OpenAPI URL or a PostgreSQL or SQL Server database connection. Create a model-facing MCP catalog without writing a custom MCP server for every source. Review, rename, hide, and describe tools so AI clients choose the right capability with better arguments. Validate the surface in Gateway Chat, then connect Claude, Cursor, VS Code, or any MCP-compatible client. Product Walkthrough Watch the product flow from source import to generated tools, curated descriptions, published MCP URL, and in-app testing. Pricing Start free, then scale capacity as MCP traffic increases. For trying the gateway and small projects. $0forever For production workflows and growing usage. $9per month or $69 per year For organizations with high throughput. $199per month or $499 per year Start with an OpenAPI spec, connect a database scope, tune the tools, and test them in Gateway Chat before connecting external clients.