Callio

Connect AI agents to external APIs through a shared gateway and MCP interface.

Meet Callio

Callio provides an API gateway and MCP server for connecting agents and applications to external tools. Developers add their own provider credentials, then use a Callio key to route requests through a common interface. The gateway handles authentication headers and forwarding, while SDK examples support JavaScript, Python, command-line requests, and agent tools.

An interactive playground lets developers configure parameters, inspect responses, save requests, and copy code snippets. Central request logs show traffic, failures, and latency across connected APIs. Team workspaces let several developers share credentials and review usage while separating billing and administrative controls. The service is designed to reduce repeated integration work across an agent's tool connections.

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Product details

Website: callio.dev
Status: Launched
Category: Developer tools
Listed: Oct 21, 2026

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