PromptLayer

PromptLayer is a monitoring and debugging platform for AI API requests. It captures and logs interactions with large language models, allowing developers to track prompts being sent, responses received, and costs incurred. It acts as a middleware layer between applications and AI providers like OpenAI, Anthropic, and others. The tool is designed for developers, teams, and organisations building applications that rely on LLM APIs. It's particularly useful for those needing to debug AI responses, optimise costs, understand usage patterns, or maintain audit trails for compliance. PromptLayer stands out for its focus on the complete AI request lifecycle. Rather than simply counting API calls, it provides visibility into actual prompts, model responses, latency, and costs all in a chronological timeline. This helps teams identify inefficient prompts, compare model cost-effectiveness, and troubleshoot issues when AI responses underperform.