> ## Documentation Index > Fetch the complete documentation index at: https://hercules.app/docs/llms.txt > Use this file to discover all available pages before exploring further. # Custom Integrations > Connect Hercules apps to third-party APIs and your internal systems, manage credentials securely, and get enterprise help with custom integration projects. Hercules apps can connect to APIs provided by third parties or your own company. If needed, Hercules professional services can help you design and implement custom integrations for your enterprise workflows. ### Can I connect to any third-party API? Yes! Hercules apps can integrate with any REST API. All you need to do is share the documentation (through a link or file upload) and Hercules can do the rest. ### Can Hercules connect to my company's internal API? Yes. You can provide documentation or we can work directly with you to set this up. Please email [sales@hercules.app](mailto:sales@hercules.app). ### Can I connect to the API generated by my app's backend? Yes. You can expose any API built on Hercules to the public with proper access controls in place. ### How should API credentials be stored? Use [Secrets](/docs/apps/secrets) for API keys and tokens. ### Can Hercules build the integration for us? Yes. Our [Professional Services](/docs/enterprise/professional-services) team can scope the work, implementation, and testing with you. Email [sales@hercules.app](mailto:sales@hercules.app) with the systems and workflows you want to connect. ### Additional FAQ See [Agent integrations](/docs/agents/integrations) for connected services and custom tools, and [Chat Integrations](/docs/ai/chat-connectors) for tools used while building apps. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.