Observe by Tanso — Open-source AI cost observability

See what every AI customer costs you. Per-feature margins, per-model costs, and cost alerts. Open source. Free to start.

Observe — AI Cost Observability

Track LLM costs per customer and feature. Per-feature margin analysis, cost alerts, and Stripe/OpenAI/Anthropic integrations. Open source on GitHub.

Tier	Price	Events/month
Free	$0	10,000
Pro	$29/mo	100,000
Team	$99/mo	1,000,000

Start free | Observe Docs

Tanso Platform (Enterprise)

Runtime entitlement enforcement, usage limits, credits, invoicing, and Stripe billing sync. Custom pricing.

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Developer Resources

• Observe Docs
• GitHub
• OpenAPI Spec (Observe)
• LLM Context (llms.txt)
• MCP Tool Reference
• Agent Authentication Guide
• TypeScript SDK

Free Tools

• Margin Analyzer — Calculate per-customer gross margin for AI SaaS
• AI Pricing Finder — Research how AI companies price their products
• Data Lab — Query pricing data for 146 SaaS companies via MCP

FAQ

How much does Observe cost?

Free tier is free forever. Pro is $29/mo, Team is $99/mo.

How much does the Platform cost?

Custom pricing. Contact us for details.

How long does integration take?

Most teams are billing in a day. One API call for entitlement checks, one for usage events.

Do I need a credit card?

No. Sign up for Observe Free with no credit card.

We already use Stripe. Why Tanso?

Stripe handles payment collection. Tanso handles everything upstream: entitlements, usage limits, margins, and invoicing.

Company

Founded in 2024. Blog | Privacy Policy | Terms of Service | Glossary | LinkedIn