Polar

Polar is a developer-first billing platform for AI companies and SaaS products, providing usage-based billing with event ingestion that tracks API calls, token consumption, and any custom metric. With open-source roots and framework adapters for Next.js, BetterAuth, and TypeScript, it delivers production-ready billing in hours rather than weeks.

The platform acts as a global Merchant of Record, handling VAT and GST compliance and chargeback management so developers focus on the product, not tax filings. Subscription tiers, one-off purchases, and customer lifecycle management are fully automated, with feature flags tied directly to subscription status.

Key benefits:

• Usage-based billing with event ingestion for API calls and token tracking
• Subscription tier management with automatic feature flag assignment
• Merchant of Record — Polar files taxes globally on your behalf
• Global VAT/GST compliance across all major jurisdictions
• One-off purchases alongside recurring subscription products
• Open-source SDKs for Next.js, TypeScript, and BetterAuth integration

Polar is a Swedish company with a transparent, developer-friendly pricing model — 4% + $0.40 per transaction with no monthly or setup fees. As a global Merchant of Record, it handles EU VAT compliance for European sales alongside international tax jurisdictions, making it straightforward for European developers to monetise software globally.