tollgate-proxy acts as a local man-in-the-middle proxy for OpenAI, Anthropic, and other LLM API traffic. It captures requests and responses, attributes precise per-request costs using effective-dated pricing tables, and supports replay-based analysis and debugging for developers building with large language models.
tollgate-proxy is an Observability & monitoring product. Tracking, attributing, and analyzing the cost of individual LLM API calls during local development and testing. It is built as an open-source project for developers. tollgate-proxy is open source under the MIT license. The product ships for the command line.
tollgate-proxy first shipped in 2026. Development happens publicly on GitHub with 9 commits in the last 90 days. Key capabilities include API Traffic Capture, Cost Attribution, and Replay Analysis.
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