text: Skip to main contentğŸ¦œï¸�ğŸ”— LangChainDocsUse casesIntegrationsAPILangSmithJS/TS DocsCTRLKIntegrationsCallbacksArgillaContextInfino - LangChain LLM Monitoring ExamplePromptLayerStreamlitChat modelsDocument loadersDocument transformersLLMsMemoryRetrieversText embedding modelsAgent toolkitsToolsVector storesGrouped by providerIntegrationsCallbacksPromptLayerOn this pagePromptLayerPromptLayer is a an LLM observability platform that lets you visualize requests, version prompts, and track usage. In this guide we will go over how to setup the PromptLayerCallbackHandler. While PromptLayer does have LLMs that integrate directly with LangChain (eg PromptLayerOpenAI), this callback is the recommended way to integrate PromptLayer with LangChain.See our docs for more information.Installation and Setupâ€‹pip install promptlayer --upgradeGetting API Credentialsâ€‹If you do not have a PromptLayer account, create one on promptlayer.com. Then get an API key by clicking on the settings cog in the navbar and