OpenRouter

OpenRouter is a unified API platform that gives developers access to 400+ language models from 70+ providers with a pay-as-you-go pricing model. It provides a single, OpenAI-compatible interface to switch between models freely, with automatic failover routing for high availability. Users can set custom data policies, budgets, and preferred vendors. The free tier offers 50 requests per day on free models, while paid usage incurs a 5.5% platform fee. This tool is ideal for developers and solopreneurs building AI applications, especially those needing to test multiple models or handle agentic workloads without committing to subscriptions.