Polar
Polar is an open-source, developer-first monetization platform that acts as a Merchant of Record (MoR), handling billing, payments, and global sales tax so software teams can sell digital products, subscriptions, usage-based billing, and license keys. The Polar API (https://api.polar.sh/v1) exposes products, prices, checkouts, customers, subscriptions, orders, benefits, license keys, a customer portal, usage meters/events, and webhooks behind Bearer organization access tokens. Not affiliated with Polar Electro (fitness wearables) or the Polaris design system.
APIs
Polar Products & Prices API
Create and manage the product catalog and its embedded pricing - one-time, recurring (monthly/yearly), and metered/usage-based prices - and attach benefits to products.
Polar Checkouts API
Create and confirm hosted checkout sessions and reusable checkout links that collect payment, apply discounts, and convert customers into orders and subscriptions.
Polar Customers API
Manage customers by Polar ID or your own external ID, read aggregated customer state (active subscriptions, granted benefits, meters), and list payment methods.
Polar Subscriptions API
List, create, update, and revoke recurring subscriptions, including proration on plan changes and export of subscription records.
Polar Orders API
Retrieve transaction records (one-time purchases and subscription renewals), generate and download invoices and receipts, and export order history.
Polar Benefits & License Keys API
Define benefits (entitlements such as license keys, file downloads, Discord/GitHub access) attached to products, track benefit grants, and issue, validate, activate, and deactiv...
Polar Meters & Events API
Ingest usage events and define meters that aggregate those events into billable quantities for usage-based (metered) prices, with per-customer meter balances.
Polar Webhooks API
Register and manage webhook endpoints, rotate signing secrets, and inspect or redeliver webhook deliveries for order, subscription, benefit, and checkout lifecycle events.