Introduction

Welcome to the Callio Developers Guide. Callio is a unified, secure proxy gateway and automation suite designed specifically for AI agents, custom developer backends, and low-code integrations.

Single Interface proxy

Call any API in the marketplace using a unified routing pattern. You authenticate with one token; we routing to your target.

Model Context Protocol

Install the Callio MCP server in Claude or Cursor to immediately grant your agents searching, inspection, and execution abilities over 100+ endpoints.

Why Callio?

Integrating dozens of distinct APIs inside LLM code generators or agent runtimes forces you to maintain huge stacks of customized schemas, handle varied retry codes, and configure individual keys. Callio resolves this:

BYOK Vault Security: Save your API keys securely inside Callio (encrypted at rest). Callio automatically injects them during forwarding.
Unified Telemetry Logs: View unified latency metrics, request counts, response codes, and bodies across all endpoints in the Developer Dashboard.
Built for Agents: The JSON schemas are structured specifically for LLM tool selection engines to reduce context usage and minimize tool invocation hallucination.

Key Capabilities

Unified Base Proxyhttps://callio.dev/api/proxy

Zero-Knowledge VaultAES-256 GCM Key-Store Encryption

Supported SDKsTypeScript / Node.js & Python Guides

Workflow AutomationsZapier & Make.com Polling triggers

System Architecture

Callio sits between your client system (or agent IDE) and the destination APIs. When a request is triggered:

Client (Agent IDE / Custom SDK / Zapier)

↓ (HTTPS with Callio Key)

Callio Gateway (Auth & BYOK Injection)

↓ (Forward Request with Encrypted Key)

Destination Provider (OpenAI, Stripe, GitHub...)