Callio
Callio is an API gateway and marketplace that provides AI agents with unified access to 50+ APIs through a single interface, handling authentication, discovery, and execution automatically.
https://www.callio.dev/?ref=producthunt
Product Information
Updated:Feb 27, 2026
What is Callio
Callio is a comprehensive API gateway platform designed specifically for AI agents and developers, offering a centralized solution to access multiple APIs through one unified interface. The platform serves as a bridge between AI agents and various API services, including search, payments, email, data, messaging, and more. With its focus on simplicity and security, Callio eliminates the complexity of managing multiple API integrations by providing a single API key that grants access to the entire marketplace of services.
Key Features of Callio
Callio appears in multiple distinct products, but the most prominent one is an API gateway/marketplace designed for AI agents. It provides a unified interface for accessing 50+ different APIs (search, payments, email, etc.) through a single API key. The platform handles authentication, rate limiting, and routing automatically, making it easy for developers to integrate various services into their AI applications.
Unified API Access: Single API key access to 50+ APIs through one unified endpoint, eliminating the need for multiple authentications and integrations
Security Features: AES-256 encryption for credentials, zero data logging of request/response bodies, and built-in rate limiting capabilities
MCP Server Integration: Compatible with various AI development tools like Claude Code, Cursor, and supports natural language API discovery and calls
API Marketplace: Extensive collection of APIs covering search, payments, AI, scraping, messaging, and more, with new APIs added weekly
Use Cases of Callio
AI Development: Developers can quickly integrate multiple APIs into their AI agents for tasks like web search, email sending, and payment processing
API Distribution: API providers can list their services on the platform to reach thousands of AI agents and developers
Startup Development: Fast-track development by accessing necessary APIs without building infrastructure for each integration
Pros
Simple integration with single API key
Comprehensive security features
Wide range of available APIs
Quick setup time (under 2 minutes)
Cons
Dependency on third-party service for critical API access
Potential additional layer of latency
How to Use Callio
Sign up for Callio: Visit www.callio.dev and create an account to get your single API key that provides access to the entire Callio marketplace
Install the Callio app: Download the Callio app on your preferred platform (iOS, Android, or Desktop) to manage calls, texts, voicemail and settings
Configure your account: Set up your business profile, customize greetings, and configure call routing preferences through the dashboard
Connect communication channels: Consolidate multiple social networking sites and communication channels to manage them from one unified interface
Integrate with your tools: Connect Callio with your existing tools like Slack for notifications and CRM systems for customer data management
Make API calls: Use the single Callio API endpoint to access any integrated service by simply changing the API slug in your requests (e.g., /api/proxy/servicename)
Monitor usage: Track call volumes, response times, and other metrics through the dashboard's analytics features
Manage team access: Add team members and set appropriate access permissions for different features and functionalities
Set up automations: Configure automated responses, call routing rules, and other workflow automations as needed
Callio FAQs
Callio is an API marketplace and gateway built for AI agents that provides a unified interface to discover, authenticate, and call multiple APIs through a single API key.
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