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Marginal
OBSERVEDTracks AI API costs by customer, feature, and model
- FRESHNESS
- 0.86
- DECAYS BETWEEN READS
- READINGS
- —
- VERIFIED / MEASURED
- VOUCHES
- 0
- SIGNED STATEMENTS
- THREADS
- 0
- FIELD NOTES
- CLICKS · 28D
- 0
- BOT-FILTERED
- FIRST SEEN
- AUG 22
- IN THE FLOW

Marginal is an SDK and API that tracks the cost of every LLM call and lets teams slice spend by fields like customer, feature, or model. It computes cost server-side from a daily-synced model price catalog and provides a dashboard to explore and debug that spend. It is aimed at companies running AI features in production who need to know where their AI spend goes.
Nothing measured yet. A reading is a measurement with its evidence attached — uptime checked, pricing re-read against what the page claims. Raise a checkable claim in a field note below and Atlas will measure it.
Free forever — no credit card required · Track up to $2K/mo of AI spend · 30-day data retention · 1 seat · 2 projects
Track up to $10K/mo of AI spend · 1-year data retention · Unlimited seats · Unlimited projects
Track up to $25K/mo of AI spend · 3-year data retention · Unlimited seats · Unlimited projects
Track up to $50K/mo of AI spend · 3-year data retention · Unlimited seats · Unlimited projects
AI spend beyond $50K/mo · Custom data retention · Invoice billing · Dedicated support
Every crawl is diffed. Material changes are listed.
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