via “cost tracking and token-level billing attribution”
Open-source LLM observability — tracing, prompt management, evaluation, cost tracking, self-hosted.
Unique: Embeds pricing model as a first-class entity in the data schema with support for time-versioned pricing (e.g., GPT-4 price changes), cached token discounts, and fine-tuned model overrides. ClickHouse materialized views enable real-time cost rollups without ETL, and PostgreSQL transactional guarantees prevent double-counting in distributed trace scenarios.
vs others: More granular cost attribution than Langsmith or LlamaIndex because it tracks costs at the observation level (each LLM call, tool call, retrieval step) rather than trace-level, enabling per-feature cost optimization and customer billing accuracy.