Callio

What it does

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

One key. One gateway. Every tool your agent needs. MCP-native and production-ready for teams shipping AI agents and AI-native apps.

Connect your AI agents and LLM applications to 175 + tools with 1 key. Bring your own keys with AES-256 encryption, zero rate-limit collisions, and native MCP support. Choose an upstream target provider API below and trace how the Callio Gateway maps keys, processes headers, and forwards calls. { "channel": "#ops-alerts", "text": "🟢 Agent task completed in 420ms" } Upstream Provider Response 200 OK < HTTP/1.1 200 OK < Content-Type: application/json < X-Callio-Time: 128ms < X-Callio-Quota: 2,341/10,000 { "ok": true, "channel": "C03248", "ts": "1778796622.04", "message": { "text": "🟢 Agent task completed in 420ms", "type": "message" } } Interactive Playground Test and prototype in real-time…from callio.dev

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