Halton Meter
Per-project LLM cost tracking. Local. No code changes.
What it does
Halton Meter is a local proxy that observes outbound LLM traffic, attributes every request to a project, and computes exact cost. One command. No code changes. Captures Claude, OpenAI, Gemini, Grok — plus OAuth surfaces like ChatGPT and Gemini Code Assist.
Does the same job
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OpenLIT's Zero-code LLM ObservabilityOct 2025 · ▲136Trace LLM requests + costs with OpenTelemetry monitoring
- AMA MitM proxy to see what your LLM tools are sendingJan 2026 · github.com · ▲218
I built this out of curiosity about what Claude Code was actually sending to the API. Turns out, watching your tokens tick up in real-time is oddly satisfying. Sherlock sits between your LLM tools and the API, showing you every request with a live dashboard, and auto-saved copies of every prompt as markdown and json.
- FFFrugon – Find which LLM calls a cheaper model could handle (local, MIT)Jul 2026 · github.com · ▲67
I started leaning in on AI heavily this year, as I wanted to get more done autonomously, but then my token usage climbed dramatically to the point where my weekly quota would run out before the end of the week, sometimes a couple of days into the week. I realised I had to do something about it else I'd have to double my spend. So I decided to start tracking my cost per task type. This revealed that a lot of my spend went to searches/scans or simple things like scouting tasks. I then decided to turn this into a simple CLI tool that can be used to read your OpenAI-style logs locally, and…
- OOOpenLLMetry – OpenTelemetry-based observability for LLMs2023 · github.com · ▲154
Hey HN, Nir, Gal and Tomer here. We’re open-sourcing a set of extensions we’ve built on top of OpenTelemetry that provide visibility into LLM applications - whether it be prompts, vector DBs and more. Here’s the repo: https://github.com/traceloop/openllmetry. There’s already a decent number of tools for LLM observability, some open-source and some not. But what we found was missing for all of them is that they were closed-protocol by design, vendor-locking you to use their observability platform or their proprietary framework for running your LLMs. It’s still early in the…
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