Introduction

Welcome to the Callio Developer Docs. Callio is a unified API gateway for products, AI agents, custom backends, and low-code workflows that need reliable access to external services.

Unified proxy interface

Call APIs in the marketplace using one routing pattern. You authenticate with a Callio key; Callio routes the request to the selected provider.

Encrypted provider keys

Store upstream provider credentials once, then let Callio inject the right authentication headers when proxying requests.

Why Callio?

Integrating dozens of APIs means maintaining different auth flows, retry behavior, request shapes, and usage logs. Callio gives you one operational layer for that work:

BYOK credential storage: Save provider API keys in Callio, encrypted at rest, and inject them during forwarding without hardcoding secrets in each app.
Unified telemetry: View latency, request counts, status codes, and error summaries across your API traffic in the developer dashboard.
Built for agentic apps: Provider metadata and request schemas are organized so agent runtimes and developer backends can discover, inspect, and call tools consistently.

Key Capabilities

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

Encrypted BYOK VaultEncrypted provider credential storage

Supported SDKsTypeScript / Node.js & Python Guides

Workflow AutomationsZapier & Make.com Polling triggers

System Architecture

Callio sits between your client system and the destination APIs. When a request is triggered:

Client (App / Agent Runtime / Workflow)

↓ (HTTPS with Callio Key)

Callio Gateway (Auth & BYOK Injection)

↓ (Forward Request with Encrypted Key)

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