Caplyr

Caplyr delivers essential controls for managing API expenses across various providers like OpenAI, Anthropic, Groq, and Together AI. Integrate protection with just a few lines of code and no configuration changes. This tool ensures your API calls align with predefined budget limits, dynamically switching to more economical models when costs escalate. Key features include strict budget guardrails that block requests exceeding your cap, an automatic downgrade system that transitions to cheaper models (e.g., Sonnet to Haiku) without disrupting service, and an instant kill switch to halt all API calls and spending during critical incidents. Caplyr operates in the execution path, offering real-time enforcement instead of just monitoring. It's designed for developers and engineering teams seeking robust financial governance over their external service usage. Setup is quick, with guides available for platforms like Vercel, Railway, AWS Lambda, and Docker. Ideal for development teams, product managers, and financial controllers who need to prevent unexpected billing. Caplyr helps maintain application uptime while providing peace of mind through proactive cost management.