Add @apibase11/mcp-client npm package — stdio-to-HTTP MCP bridge

Published as both @apibase11/mcp-client and apibase-mcp-client on npm.
Lets Claude Desktop, Cursor, Windsurf connect to APIbase via npx.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: APIbase

packages/mcp-client/README.md

@@ -0,0 +1,103 @@
+# APIbase MCP Client
+
+MCP client for [APIbase.pro](https://apibase.pro) — connect AI agents to 56+ tools (flights, prediction markets, weather, and more) via the Model Context Protocol.
+
+Available as two identical packages:
+
+| Package | Install |
+|---------|---------|
+| `@apibase11/mcp-client` | `npx -y @apibase11/mcp-client` |
+| `apibase-mcp-client` | `npx -y apibase-mcp-client` |
+
+## Quick Start
+
+```bash
+npx -y apibase-mcp-client
+```
+
+## Usage
+
+### Claude Desktop
+
+Add to `claude_desktop_config.json`:
+
+```json
+{
+  "mcpServers": {
+    "apibase": {
+      "command": "npx",
+      "args": ["-y", "@apibase11/mcp-client"]
+    }
+  }
+}
+```
+
+With API key:
+
+```json
+{
+  "mcpServers": {
+    "apibase": {
+      "command": "npx",
+      "args": ["-y", "@apibase11/mcp-client", "ak_live_YOUR_KEY"]
+    }
+  }
+}
+```
+
+Or via environment variable:
+
+```json
+{
+  "mcpServers": {
+    "apibase": {
+      "command": "npx",
+      "args": ["-y", "@apibase11/mcp-client"],
+      "env": {
+        "APIBASE_API_KEY": "ak_live_YOUR_KEY"
+      }
+    }
+  }
+}
+```
+
+### Cursor / Windsurf / VS Code
+
+Same config pattern — add to your MCP settings:
+
+```json
+{
+  "command": "npx",
+  "args": ["-y", "apibase-mcp-client"]
+}
+```
+
+## Authentication
+
+Three modes (in priority order):
+
+1. **CLI argument**: `npx apibase-mcp-client ak_live_YOUR_KEY`
+2. **Environment variable**: `APIBASE_API_KEY=ak_live_YOUR_KEY`
+3. **Auto-register**: omit the key — APIbase creates one automatically on first request
+
+## Available Tools
+
+56+ tools across categories:
+
+- **Flights**: search, price, status (Amadeus, Sabre)
+- **Prediction Markets**: Polymarket events, prices, orderbooks
+- **Trading**: Hyperliquid, AsterDEX market data
+- **Weather**: current, forecast, alerts (OpenWeatherMap)
+- **And more** — new providers added regularly
+
+Use `tools/list` to discover all available tools.
+
+## How It Works
+
+Stdio-to-HTTP bridge: translates MCP stdio transport (used by Claude Desktop, Cursor, etc.) to Streamable HTTP transport (used by APIbase server). No tool re-registration — pure transport proxy.
+
+## Links
+
+- [APIbase.pro](https://apibase.pro)
+- [GitHub](https://github.com/whiteknightonhorse/APIbase)
+- [MCP Protocol](https://modelcontextprotocol.io)