One MCP server. Every API your agent needs.

Drop the Callio MCP server into Cursor, Claude, Antigravity, or any MCP-compatible client and your agent can call 184 APIs through one Callio key.

Get API Key Installation instructions

How MCP works with Callio

Model Context Protocol (MCP) is how tools like Cursor and Antigravity connect to external capabilities. The editor starts a small MCP server; the AI can call tools that server exposes (instead of you wiring one integration per API).

End-to-End Flow

How requests route from your editor configuration through Callio to provider APIs.

Add to Config

You add Callio MCP server to your local config and set your CALLIO_API_KEY.

Subprocess Spawn

Cursor or Antigravity launches the server via stdio. It registers under Settings → MCP with three tools.

Catalog Read

The agent calls search_apis or get_api_info to explore Callio's integrations.

Proxy Execute

To execute, the agent triggers call_api which securely forwards requests through our HTTPS proxy.

Auth Injection

We dynamically attach your encrypted credentials (BYOK) at the proxy layer and complete the call safely.

Why only three tools?

One tool per vendor would mean hundreds of MCP tools cluttering your context. Callio exposes discover → describe → call so the agent can dynamically use any integrated API without requiring new MCP releases.

After you edit config

Restart your MCP server (e.g. Cursor: Command Palette → MCP restart, or restart your editor) to reload environment variables and keys. Check the server panel to confirm a green status.

Full reference: Documentation → MCP

Works with your favorite AI tools

Claude Code

Anthropic's coding agent

~/.claude/claude_desktop_config.json

Cursor

AI-powered code editor

.cursor/mcp.json

Antigravity

AI development platform

MCP Settings

Setup in 2 minutes

Get your Callio API key

Go to API Keys

Add to your AI tool config

Copy this JSON into your MCP configuration file. Replace the API key with your own.

{
  "mcpServers": {
    "callio": {
      "command": "npx",
      "args": ["-y", "callio-mcp"],
      "env": {
        "CALLIO_API_KEY": "callio_your_key_here"
      }
    }
  }
}

Claude Code: ~/.claude/claude_desktop_config.json

Cursor: .cursor/mcp.json

Antigravity: MCP Settings panel

Start using APIs

Your agent now has 3 powerful tools. Just ask in natural language:

"Search for email APIs on Callio"

"What endpoints does the SendGrid API have?"

"Get post #1 from JSONPlaceholder through Callio"

"Search for AI companies using Apollo API"

3 tools, unlimited power

search_apis

Discover and browse 184 APIs by name, category, or description.

get_api_info

Get full details — endpoints, parameters, examples, auth info.

call_api

Execute any API call. Auth, rate limits, and routing all handled.

Ready to supercharge your agent?

Get started in under 2 minutes. Free accounts include 5 proxy requests/month; paid plans add more.

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