Used by Tailwind Labs and recognized as an official GitHub funding partner, Polar is the open-source billing infrastructure that lets developers ship production-ready monetization in hours instead of weeks. Meter tokens, API calls, agent runs, GPU seconds, and storage with event-level precision, then compose usage billing with subscriptions, seats, credits, trials, and discounts into whatever pricing model your product requires. As Merchant of Record, Polar handles sales tax, VAT, chargebacks, receipts, and regulatory compliance across all supported countries so you receive clean payouts without building tax infrastructure. Integrate via the full REST API with official SDKs for JavaScript, Python, PHP, and Go, plus framework adapters for Next.js, Astro, Remix, SvelteKit, and Laravel enabling checkout integration in minutes. Automatically deliver benefits upon purchase including GitHub repository access, Discord roles, license keys, file downloads, and meter credits through configurable automation rules. The built-in customer portal provides subscription management, payment method updates, invoice history, and benefit access with full white-label branding. Monitor revenue, costs, and margins through real-time analytics dashboards showing the unit economics every AI startup needs to scale. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. Apache License 2.0 licensed.

Software makers who would rather not rent a licensing backend use Keygate to issue, sell, and enforce license keys from infrastructure they control. You create desktop, SaaS, or hybrid products and sell them as subscriptions, perpetual licenses, perpetual licenses with a maintenance period, trials, or floating concurrent licenses that are checked out, heartbeated, and returned automatically. The admin dashboard manages products, plans, customers, licenses, API keys, webhooks, analytics, audit logs, team members, email templates, and branding, with search, filters, and CSV or JSON export. Your application activates and verifies keys through the license API, enforces per-device or per-user activation limits with grace periods, and can verify Ed25519 signed tokens offline with a public key. Usage metering tracks API calls, storage, bandwidth, or custom metrics against quotas with hourly, daily, monthly, or yearly reset cycles and webhook threshold warnings. Connecting Stripe makes checkout create licenses automatically, follows plan and seat changes with proration, handles refunds and cancellations, sends dunning emails after failed payments, and gives customers a billing portal and self-service license management. Team seats, feature entitlements, purchasable add-ons, scoped API keys, and optional S3-backed release hosting round out the selling stack in one binary with one PostgreSQL database. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. AGPL-3.0 licensed.