Supergateway — Bridge MCP Servers via SSE and HTTP

What is Supergateway?

Supergateway converts any MCP server that uses stdio transport into an SSE (Server-Sent Events) or HTTP server. This enables remote access to local MCP servers, cloud deployment, and sharing a single MCP server across multiple AI clients.

Answer-Ready: Supergateway bridges MCP stdio servers to SSE/HTTP transport, enabling remote access, cloud deployment, and multi-client sharing of any MCP server. One command to expose local MCP servers over the network.

Best for: Teams deploying MCP servers to the cloud or sharing them across multiple AI clients. Works with: Any MCP stdio server, Claude Code, Cline, Cursor. Setup time: Under 1 minute.

Core Features

1. Stdio to SSE Bridge

# Expose filesystem MCP server via SSE
npx -y supergateway \
  --stdio "npx -y @modelcontextprotocol/server-filesystem /data" \
  --port 8000

# Connect from Claude Code (remote)
# .mcp.json
{
  "mcpServers": {
    "remote-fs": {
      "type": "sse",
      "url": "http://server-ip:8000/sse"
    }
  }
}

2. Stdio to HTTP (Streamable HTTP)

npx -y supergateway \
  --stdio "npx -y @modelcontextprotocol/server-github" \
  --transport httpStream \
  --port 8000

3. SSE to Stdio (Reverse Bridge)

# Convert a remote SSE server back to stdio for local tools
npx -y supergateway \
  --sse "http://remote-server:8000/sse" \
  --outputTransport stdio

4. Multiple Transports

5. Docker Deployment

FROM node:20-slim
RUN npm install -g supergateway @modelcontextprotocol/server-github
CMD ["supergateway", "--stdio", "mcp-server-github", "--port", "8000"]
EXPOSE 8000

docker build -t mcp-github .
docker run -p 8000:8000 -e GITHUB_TOKEN=ghp_... mcp-github

Use Cases

Architecture

Local MCP Server (stdio)
    ↓
Supergateway (bridge)
    ↓
SSE/HTTP endpoint
    ↓
Claude Code / Cline / Cursor (remote clients)

FAQ

Q: Is it secure? A: Supergateway itself doesn't add authentication. Use a reverse proxy (nginx, Caddy) with auth for production.

Q: Does it support all MCP features? A: Yes, full MCP protocol support including tools, resources, and prompts.

Q: Performance overhead? A: Minimal — just transport translation. No processing of MCP payloads.