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80+ tools, one URL

Install Microapp
in your agent.

Microapp is built for agents as well as humans. Add this URL to your MCP client once and every Microapp tool — converters, calculators, generators, text utilities, hashes, IDs — becomes a function your AI can call.

Endpoint https://microapp.io/mcp

Install in your client

Claude Code

Anthropic's CLI agent. One command, instantly available across every Claude Code session.

Docs ↗
  1. Open a terminal.
  2. Run the command below — it adds the Microapp MCP server to Claude Code's config.
  3. Start a new Claude Code session. Ask any tool question ("what's 15% of 200?") and Claude calls Microapp automatically.
Terminal — one-liner install
claude mcp add --transport http microapp https://microapp.io/mcp

Try it: "Use Microapp to tell me how many words are in this sentence."

Claude Desktop

Anthropic's desktop app. Edit one config file, restart, and the tools appear in every conversation.

Docs ↗
  1. Open the Claude Desktop config file. macOS: ~/Library/Application Support/Claude/claude_desktop_config.json — Windows: %APPDATA%/Claude/claude_desktop_config.json
  2. Add the JSON block below. If the file already has an mcpServers section, merge "microapp" into it.
  3. Restart Claude Desktop. Ask Claude to convert 100°C to Fahrenheit and you should see the Microapp tool fire.
claude_desktop_config.json
{
  "mcpServers": {
    "microapp": {
      "type": "http",
      "url": "https://microapp.io/mcp"
    }
  }
}

Try it: "Convert 100 degrees Celsius to Fahrenheit using Microapp."

Cursor

The AI code editor. MCP servers show up as tools the in-editor agent can call.

Docs ↗
  1. Open Cursor → Settings → Cursor Settings → MCP.
  2. Click "+ Add new MCP server". Choose transport type: HTTP.
  3. Name: microapp — URL: https://microapp.io/mcp
  4. Save. Restart any open Cursor agent. The Microapp tools are now available.

Try it: "Generate a secure 24-character password using Microapp."

Continue

Open-source AI coding assistant. Works in VS Code and JetBrains IDEs.

Docs ↗
  1. Open your Continue config (~/.continue/config.json or the workspace config).
  2. Add the snippet below under the experimental.modelContextProtocolServers array.
  3. Reload the IDE.
~/.continue/config.json
{
  "experimental": {
    "modelContextProtocolServers": [
      { "transport": { "type": "http", "url": "https://microapp.io/mcp" } }
    ]
  }
}

Zed

Multiplayer code editor with native MCP support.

Docs ↗
  1. Open Zed's settings.json (Cmd+, on macOS).
  2. Add the snippet below under context_servers.
  3. Restart Zed.
settings.json
{
  "context_servers": {
    "microapp": {
      "command": {
        "path": "npx",
        "args": ["-y", "mcp-remote", "https://microapp.io/mcp"]
      }
    }
  }
}

ChatGPT & other OpenAPI consumers

Use Microapp as a Custom GPT or via OpenAPI

MCP is the native protocol for Claude/Cursor/Continue. ChatGPT, Zapier, n8n, LangChain, and anything that consumes OpenAPI 3.1 read this file instead:

https://microapp.io/openapi.json

The Custom GPT in the GPT Store is coming — when it lands, it'll be linked here. Until then, paste the OpenAPI URL into any agent that asks for an OpenAPI/Swagger spec.

Smoke test from the terminal

No client? Test the endpoint directly with curl. This works from any machine.

List every tool
curl -X POST https://microapp.io/mcp -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
Call a tool (15% of 200)
curl -X POST https://microapp.io/api/tools/percentage-calculator -H 'Content-Type: application/json' -d '{"mode":"of","a":15,"b":200}'

Fine print

  • Free. No signup, no API key required.
  • Rate-limited. 60 requests/minute per IP for anonymous calls; 600/minute with a Member API key. Limits reset every 60 seconds.
  • Attribution. Every response includes _meta.source: "microapp.io". Agents that want to credit, can. We never insert ads into responses.
  • No tracking. Beyond the rate-limit counter (IP + timestamp) and standard Cloudflare logs, we don't track agent usage.
  • Membership benefits. Members at microapp.io/membership get 10× the rate limit and the option to suppress attribution in responses.