---
title: Observe by Tanso
description: Open-source AI cost observability. See profitability by feature and customer.
last_updated: 2026-05-13
---

# Tanso — See what every AI customer costs you

Tanso is a monetization platform for B2B SaaS with runtime entitlement enforcement. Free margin analytics for AI SaaS. See profitability by feature and customer, then enforce limits when you're ready.

## Products

### Observe — AI Cost Observability

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

- **Free**: 10,000 events/month, 90-day retention, 3 cost alerts
- **Pro** ($29/mo): 100,000 events/month, 365-day retention, unlimited alerts
- **Team** ($99/mo): 1,000,000 events/month, unlimited retention, priority support

[Start free →](https://observe.tansohq.com/signup)

### Tanso Platform — Billing & Entitlement Enforcement

Runtime entitlement enforcement, pricing management, usage limits, credits, invoicing, and Stripe billing sync. Check access before requests run — denied requests never hit your compute.

- Runtime entitlement enforcement
- Plans and pricing management (change pricing without a deploy)
- Usage limits, credits, and access gating
- Invoicing and Stripe sync
- MCP server for AI agent integration

[Contact us →](https://cal.com/katrina-laszlo/30-minute-meeting)

### Data Lab — SaaS Pricing Intelligence

Query structured pricing data for 146 SaaS companies via MCP. Pricing models, AI packaging strategies, competitive analysis, and pricing change tracking.

[Explore →](https://data.tansohq.com)

## Developer Resources

- [OpenAPI Spec (Platform)](https://www.tansohq.com/openapi.json)
- [OpenAPI Spec (Observe)](https://www.tansohq.com/observe-openapi.json)
- [OpenAPI Spec (Data Lab)](https://www.tansohq.com/data-openapi.json)
- [Agent Authentication Guide](https://www.tansohq.com/agent-auth.md)
- [LLM Context (llms.txt)](https://www.tansohq.com/llms.txt)
- [MCP Tool Reference](https://www.tansohq.com/llms-mcp.txt)
- [TypeScript SDK](https://github.com/tansohq/tanso-typscript-sdk)

## Free Tools

- [Margin Analyzer](https://www.tansohq.com/margin-analyzer) — Calculate per-customer gross margin for AI SaaS
- [AI Pricing Finder](https://www.tansohq.com/ai-pricing-finder) — Research how AI companies price their products
- [Data Lab](https://data.tansohq.com) — Query pricing data for 146 SaaS companies

## Blog

- [The Missing Layer in Your Billing Stack](https://www.tansohq.com/blog/missing-layer-billing-stack)
- [Why Pricing Infrastructure Gets Hard Fast](https://www.tansohq.com/blog/pricing-infrastructure-complexity)
- [When More Customers Mean Bigger Losses](https://www.tansohq.com/blog/more-customers-bigger-losses)
- [Pricing Is a Real Moat in AI SaaS](https://www.tansohq.com/blog/pricing-moat-ai-saas)
- [How 30 AI Companies Actually Price Their Products](https://www.tansohq.com/blog/ai-pricing-research)
- [More posts →](https://www.tansohq.com/blog)

## Sitemap

See the full [sitemap](/sitemap.md) for all pages.