Callio is a unified API gateway for AI agents. Instead of managing auth, rate limits, and keys for every API your agent uses, connect them all through one proxy. Works with Claude Code, Cursor, Antigravity, and any MCP-compatible tool. Browse APIs, generate a single Callio key, and start calling — we handle auth injection, usage tracking, and billing. Free tier included. One key, every API, zero config

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Callio is a unified API gateway for AI agents that simplifies connecting to multiple external APIs. Instead of managing separate keys, auth setups, and rate limits for each API, developers generate a single Callio key and route all agent calls through one proxy. It supports MCP Server for tools like Claude Code and Cursor, offers a REST proxy for any AI framework, includes a real-time usage dashboard, and provides a free tier with 50 requests/month.

Callio: Connect any API with AI Agent in under 5 mins