Three API calls.
That's your entire billing layer.

Add subscriptions to your app.
billing.ts
// Subscribe a customer to a plan
await owo.attach({
  customer: "user@acme.com",
  product:  "pro",
});

// Check if they can use a feature
const { allowed } = await owo.check({
  customer: "user@acme.com",
  feature:  "gpu-inference",
});

// Record usage
await owo.track({
  customer: "user@acme.com",
  feature:  "gpu-inference",
});

Built for the way AI get billed

Real-time metering, subscription management, and invoicing—all handled by one simple SDK.

AI
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Steal Pricing models from companies you trust.

Copy the exact billing patterns used by OpenAI Codex, Clerk, Cursor, Resend and other companies.

Basecamp
Vendor snapshot
Snapshot from Basecamp
Verified on 2026-03-09

Flat subscription

Anatomy
Postpaid
Free One project at a time
Plus $15 / user / month
Pro Unlimited $299 / month billed annually

"Basecamp currently sells three plans: Free, Plus, and Pro Unlimited."

Details
Notion
Vendor snapshot
Snapshot from Notion
Verified on 2026-03-09

Included quota SaaS

Anatomy
Postpaid
Free $0
Plus $10 / member / month
Business $20 / member / month

"Notion's public pricing is per member, not quota-based metering."

Details
OpenAI Codex
Vendor snapshot
Snapshot from OpenAI Codex
Verified on 2026-03-09

OpenAI Codex

Anatomy
Postpaid
Free & Go Limited-time access
Paid plans Higher limits and credits
Top-ups Additional credits available

"OpenAI presents Codex as part of ChatGPT plan packaging."

Details
AWS Lambda
Vendor snapshot
Snapshot from AWS Lambda
Verified on 2026-03-09

Pay as you go

Anatomy
Postpaid
Free tier 1M requests + 400k GB-seconds
Requests $0.20 / 1M requests
Compute $16.67 / 1M GB-seconds

"Requests and compute are billed separately after the free tier."

Details
Stripe
Vendor snapshot
Snapshot from Stripe
Verified on 2026-03-09

Package overage

Anatomy
Postpaid
PAYG 0.7% of billing volume
Contract From $620 / month
Billing mode Software fee on billed revenue

"The public pricing is based on billing volume, not API request blocks."

Details
AWS S3
Vendor snapshot
Snapshot from AWS S3
Verified on 2026-03-09

Graduated pricing

Anatomy
Postpaid
Storage Varies by storage class
GET requests From $0.0004 / 1,000
Lifecycle transitions $0.01 / 1,000

"Storage class selection changes the storage economics."

Details
Snowflake
Vendor snapshot
Snapshot from Snowflake
Verified on 2026-03-09

Snowflake editions

Anatomy
Postpaid
Editions Standard to VPS
Capacity On-demand or prepaid
Billing model Consumption-based

"Snowflake's public page is edition-led, not threshold-led."

Details
Slack
Vendor snapshot
Snapshot from Slack
Verified on 2026-03-09

Per seat

Anatomy
Postpaid
Pro monthly $8.75 / user / month
Pro annual $7.25 / user / month
Higher tiers Business+ and Enterprise Grid

"Slack's public pricing is explicitly per-user."

Details
Clerk
Vendor snapshot
Snapshot from Clerk
Verified on 2026-03-09

MAU pricing

Anatomy
Postpaid
Hobby $0
Pro $20 / month billed annually
Overage $0.02 / additional user

"The public page includes 50,000 users before overage on Pro."

Details
Figma
Vendor snapshot
Snapshot from Figma
Verified on 2026-03-09

Seats + usage

Anatomy
Postpaid
Starter Free
Professional Seat-based pricing
Org/Enterprise Admin and governance upgrades

"Figma's public pricing is still seat-led."

Details
Pinecone
Usage-based
Snapshot from Pinecone
Verified on 2026-03-09

Minimum commitment

Anatomy
Postpaid
Minimum $50 / month
Standard plan $0.33/GB + $4-24/M units
Enterprise $500 / month minimum

"Customer is charged the minimum even if usage is lower."

Details
Resend
Subscription + quota
Snapshot from Resend
Verified on 2026-03-09

Volume tiers

Anatomy
Postpaid
Free 3,000 emails
Pro $20 / 50,000 emails
Scale $90 / 100,000 emails

"Tiers are based on total monthly volume."

Details
Replicate
Usage-based
Snapshot from Replicate
Verified on 2026-03-09

GPU tiers

Anatomy
Postpaid
T4 GPU $0.000225/sec ($0.81/hr)
A100 GPU $0.0014/sec ($5.04/hr)
H100 GPU $0.001525/sec ($5.49/hr)

"Billing starts when inference begins, ends when complete."

Details
Cursor
Subscription + quota
Snapshot from Cursor
Verified on 2026-03-09

Request tiers

Anatomy
Postpaid
Hobby Limited requests
Pro $20/mo - Extended limits
Pro+ $60/mo - 3x usage

"Request limits reset monthly."

Details
Replit
Vendor snapshot
Snapshot from Replit
Verified on 2026-03-09

Replit credits

Anatomy
Postpaid
Starter Free daily Agent credits
Core $20 / month billed annually + $25 credits
Pro $100 credits + up to 15 collaborators

"Replit's pricing page is plan-led, with monthly credits bundled into paid tiers."

Details
Basecamp
Vendor snapshot
Snapshot from Basecamp
Verified on 2026-03-09

Flat subscription

Anatomy
Postpaid
Free One project at a time
Plus $15 / user / month
Pro Unlimited $299 / month billed annually

"Basecamp currently sells three plans: Free, Plus, and Pro Unlimited."

Details
Notion
Vendor snapshot
Snapshot from Notion
Verified on 2026-03-09

Included quota SaaS

Anatomy
Postpaid
Free $0
Plus $10 / member / month
Business $20 / member / month

"Notion's public pricing is per member, not quota-based metering."

Details
OpenAI Codex
Vendor snapshot
Snapshot from OpenAI Codex
Verified on 2026-03-09

OpenAI Codex

Anatomy
Postpaid
Free & Go Limited-time access
Paid plans Higher limits and credits
Top-ups Additional credits available

"OpenAI presents Codex as part of ChatGPT plan packaging."

Details
AWS Lambda
Vendor snapshot
Snapshot from AWS Lambda
Verified on 2026-03-09

Pay as you go

Anatomy
Postpaid
Free tier 1M requests + 400k GB-seconds
Requests $0.20 / 1M requests
Compute $16.67 / 1M GB-seconds

"Requests and compute are billed separately after the free tier."

Details
Stripe
Vendor snapshot
Snapshot from Stripe
Verified on 2026-03-09

Package overage

Anatomy
Postpaid
PAYG 0.7% of billing volume
Contract From $620 / month
Billing mode Software fee on billed revenue

"The public pricing is based on billing volume, not API request blocks."

Details
AWS S3
Vendor snapshot
Snapshot from AWS S3
Verified on 2026-03-09

Graduated pricing

Anatomy
Postpaid
Storage Varies by storage class
GET requests From $0.0004 / 1,000
Lifecycle transitions $0.01 / 1,000

"Storage class selection changes the storage economics."

Details
Snowflake
Vendor snapshot
Snapshot from Snowflake
Verified on 2026-03-09

Snowflake editions

Anatomy
Postpaid
Editions Standard to VPS
Capacity On-demand or prepaid
Billing model Consumption-based

"Snowflake's public page is edition-led, not threshold-led."

Details
Slack
Vendor snapshot
Snapshot from Slack
Verified on 2026-03-09

Per seat

Anatomy
Postpaid
Pro monthly $8.75 / user / month
Pro annual $7.25 / user / month
Higher tiers Business+ and Enterprise Grid

"Slack's public pricing is explicitly per-user."

Details
Clerk
Vendor snapshot
Snapshot from Clerk
Verified on 2026-03-09

MAU pricing

Anatomy
Postpaid
Hobby $0
Pro $20 / month billed annually
Overage $0.02 / additional user

"The public page includes 50,000 users before overage on Pro."

Details
Figma
Vendor snapshot
Snapshot from Figma
Verified on 2026-03-09

Seats + usage

Anatomy
Postpaid
Starter Free
Professional Seat-based pricing
Org/Enterprise Admin and governance upgrades

"Figma's public pricing is still seat-led."

Details
Pinecone
Usage-based
Snapshot from Pinecone
Verified on 2026-03-09

Minimum commitment

Anatomy
Postpaid
Minimum $50 / month
Standard plan $0.33/GB + $4-24/M units
Enterprise $500 / month minimum

"Customer is charged the minimum even if usage is lower."

Details
Resend
Subscription + quota
Snapshot from Resend
Verified on 2026-03-09

Volume tiers

Anatomy
Postpaid
Free 3,000 emails
Pro $20 / 50,000 emails
Scale $90 / 100,000 emails

"Tiers are based on total monthly volume."

Details
Replicate
Usage-based
Snapshot from Replicate
Verified on 2026-03-09

GPU tiers

Anatomy
Postpaid
T4 GPU $0.000225/sec ($0.81/hr)
A100 GPU $0.0014/sec ($5.04/hr)
H100 GPU $0.001525/sec ($5.49/hr)

"Billing starts when inference begins, ends when complete."

Details
Cursor
Subscription + quota
Snapshot from Cursor
Verified on 2026-03-09

Request tiers

Anatomy
Postpaid
Hobby Limited requests
Pro $20/mo - Extended limits
Pro+ $60/mo - 3x usage

"Request limits reset monthly."

Details
Replit
Vendor snapshot
Snapshot from Replit
Verified on 2026-03-09

Replit credits

Anatomy
Postpaid
Starter Free daily Agent credits
Core $20 / month billed annually + $25 credits
Pro $100 credits + up to 15 collaborators

"Replit's pricing page is plan-led, with monthly credits bundled into paid tiers."

Details
ANY

Bring your own provider.

Owostack is Provider Agnostic. Bring the provider of your choice.

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