Polar

Polar operates a billing and monetization platform for software developers and software companies, positioning itself as infrastructure that spans usage metering, subscriptions, invoicing and payment collection. Core product capabilities include usage-based billing driven by event ingestion (tokens, API calls, agent runs, compute and storage), recurring subscription plans with trials, upgrades and proration, seat-based billing with automatic proration, and prepaid credit balances that draw down as usage accrues. The platform also offers hosted checkout links, embedded checkout and a checkout API, plus automated entitlement delivery such as license keys, file downloads (up to 10GB), GitHub private repository access and Discord role assignment.

A central element of the offering is Polar acting as merchant of record: the company resells customers' products in over 100 markets and assumes responsibility for payments, VAT/GST/sales tax calculation and remittance, fraud, refunds and chargebacks, then pays out net revenue to the seller's bank account. Polar also surfaces cost and margin analytics, placing inference or usage costs alongside collected revenue to show gross margin per customer. The company describes itself as open source and building in public, and states a mission to build the finance layer for the next generation of AI products, with an ambition to become the standard "Events-Analytics-Billing" stack.

Integration is offered through native JavaScript/TypeScript and Python SDKs, webhooks, and adapters for roughly twelve frameworks including Next.js, Nuxt, Remix, SvelteKit, Astro, Express, Fastify, Hono, Deno, Elysia, Tanstack Start, Laravel and BetterAuth.

Founding story

A third-party profile states Polar was founded in 2022 by Birk Jernström, motivated by the difficulty developers — particularly in the open-source ecosystem — face in monetizing their software, with the stated aim of growing the open-source economy by giving creators infrastructure to earn from their work.

Business model

Polar sells billing infrastructure as a service and takes a percentage of transactions processed on behalf of its customers, layered on optional monthly subscription tiers that reduce the per-transaction rate. As merchant of record, it also collects and remits sales taxes on behalf of sellers and handles payouts.

Transaction-based fees combined with optional monthly plans: Starter is free at 5.00% + 50¢ per transaction; Pro is $20/month at 3.80% + 40¢; Growth is $100/month at 3.60% + 35¢; Scale is $400/month at 3.40% + 30¢. Documentation notes additional fees may apply for some transactions (e.g. international cards) and that payout fees are charged by payment providers. Enterprise pricing is handled through sales.

Traction

At the June 2025 seed announcement, Polar reported thousands of developers using the platform since the v1.0 launch in September 2024, average revenue growth of over 120% month-over-month for its sellers over the prior six months, 17,000+ signups, 16,000+ followers on X, 5,300 GitHub stars and 1,500 Discord members. A third-party profile states the platform has amassed over 18,000 customers globally. Public testimonials come from figures associated with Vercel, HashiCorp, FastAPI and Stilla AI.

Latest developments

Polar's current site markets the platform as a billing stack for AI workloads, with usage metering for tokens, agent runs and GPU seconds, seats, credits, cost insights showing per-customer gross margin, and scheduled payouts. It has launched a Startup Program giving early-stage AI startups the Scale plan free for twelve months, and is hiring for senior product design, platform and product engineering roles in Europe plus risk & compliance and merchant support roles in the United States.