Experiential is an open-source gateway and router designed to manage agentic workflows through a unified, OpenAI-compatible API. The platform enables developers to consolidate hosted, bring-your-own-key (BYOK), and local models—including providers like OpenAI, Anthropic, Gemini, Azure, Bedrock, Fireworks, and OpenRouter—into a single interface. Technically, the system utilizes a compiled native data plane to serve routes on loopback when run locally via the exp command. It facilitates advanced traffic management by allowing users to convert production traffic into custom routers optimized for specific metrics such as quality, latency, and cost. A key feature is the ability to optimize routing behavior by training against OpenTelemetry (OTLP) traces; users can ingest trace datasets, such as the terminal-tasks OTLP dataset from Hugging Face, to build and refine project-specific routers using the exp build command. Additionally, the tool supports model fine-tuning through integration with Tinker. For governance, the gateway provides granular controls over user permissions, model access, and expenditure, including a default $50.00 command budget during initial setup. The platform offers both a local installation via pip install experiential and a managed hosted service at platform.experientiallabs.ai, featuring integrated PostHog telemetry for product analytics while maintaining privacy by excluding raw prompts and credentials.