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Polar is an open-source, developer-first Merchant of Record built on top of Stripe, handling subscriptions, one-time payments, sales tax, and license-key style entitlements at 4% + 40¢. It is the only MoR with a full Apache-2.0 codebase and native SDKs for Better Auth, Next.js, and Supabase.
Polar (polar.sh) is an open-source, developer-first Merchant of Record that handles billing, sales tax, and digital-product delivery for software companies — at a headline rate of 4% + $0.40 per transaction. We rate it 83/100 — the most credible open-source alternative to Lemon Squeezy and Paddle in 2026, with a clear caveat about international + subscription surcharges that bring real-world rates closer to 6% + $0.40.
Polar is built by Polar Software AB, a Stockholm-based startup co-founded by Birk Jernström in 2022. The full source code lives at polarsource/polar under an Apache License 2.0, and the project crossed 5,300 GitHub stars in early 2026 with more than 1,500 active members in its Discord community. Polar v1.0 — the version that flipped the company from an open-source funding tool to a full Merchant of Record — shipped on .
Polar's distinguishing pitch is straightforward: every other modern MoR (Lemon Squeezy, Paddle, Gumroad) is a closed black box. Polar is the only one whose entire pricing engine, checkout flow, webhook system and tax pipeline is fully auditable on GitHub, plus it ships first-party SDKs for Better Auth, Next.js, Supabase, Encore.ts, and Laravel that no other MoR currently matches.
@polar-sh/better-auth npm package auto-creates a Polar customer when a Better Auth user signs up, exposes a checkout() helper, and gives users a self-serve portal — turning a typical Stripe + tax + auth wiring job into about 30 lines of TypeScript./docs/llms-full.txt bundle so AI coding agents like Cursor, Claude Code and Codex can wire up checkout flows from natural-language prompts in one shot.order.paid and subscription.canceled.
Sentiment on Hacker News, r/SaaS and r/webdev is mostly positive but with a clear caveat about real-world fees. The Show HN thread for Polar's v1.0 launch praised the team for being the first credible open-source MoR — multiple commenters noted that the Apache-2.0 license meant they could finally trust the billing stack they were betting their business on. Better Auth founder Bereket Engida and several Vercel and Supabase engineers publicly endorsed the platform on X within weeks of v1.0.
The recurring complaint is the gap between the headline price and the effective rate. Independent breakdowns (notably UserJot and Dodo Payments' competitive review) point out that international cards add 1.5%, subscriptions add 0.5%, and chargebacks cost a flat $15 — so a SaaS with 40% international subscribers is effectively paying around 6% + $0.40, a 50% premium over the "4%" sticker. A February 2026 Reddit thread titled "Paddle is slow and Polar.sh is non-responsive" flagged support latency under 24 hours as a real pain point during disputes.
There is no monthly subscription, no minimum, and no per-seat fee. Every dollar of cost is a transaction fee. The full live fee schedule lives at polar.sh/docs/merchant-of-record/fees and looks like this:
| Fee Type | Rate | Notes |
|---|---|---|
| Base transaction fee | 4% + $0.40 | Applied to every successful payment. |
| International card surcharge | +1.5% | Any card issued outside your billing country. |
| Subscription surcharge | +0.5% | Recurring payments only — one-off purchases are exempt. |
| Chargeback fee | $15 flat | Refunded if you win the dispute. |
| Payout fee | Stripe pass-through | Roughly $2 per international wire, free for ACH. |
For a US-only SaaS selling $30/month subscriptions to domestic customers, the all-in cost is about 4.9% per transaction. For a developer tool with 50% international subscribers, expect closer to 6.0% + $0.40.
Best for: Solo developers and small teams shipping VS Code / Cursor / JetBrains extensions, AI agents, npm libraries with a paid tier, GitHub-gated open-source products, and indie SaaS founders who want one bill instead of stitching together Stripe + Stripe Tax + Anrok + Lemon Squeezy. The Better Auth and Supabase plugins make it especially compelling for the modern Next.js + Postgres stack.
Not ideal for: High-volume SaaS doing $1M+ ARR with mostly international subscribers — at that scale a direct Stripe + Anrok or Stripe + TaxJar combination usually beats 6% all-in. Also a poor fit for physical-goods commerce (use Shopify) or for teams already deeply invested in Paddle/Lemon Squeezy without a real reason to migrate.
Pros:
Cons:
Lemon Squeezy is the closest competitor: also a Merchant of Record, also developer-friendly, but closed source and now owned by Stripe. Paddle covers more countries (~200) but its UI is dated and pricing is opaque. Stripe + Anrok is the build-it-yourself option — cheaper at scale but you remain the merchant of record and inherit all VAT liability. For pure open source, Listmonk-style self-hosting with raw Stripe is an option but you give up the MoR shield entirely.
If you ship a developer tool, AI agent, VS Code extension or a small SaaS and you want to stop wiring Stripe + Stripe Tax + license-key infrastructure by hand, Polar is the cleanest option in 2026 — and the only one whose code you can actually read. Just be honest about the real fee math: budget 5–6% of revenue, not 4%, and the choice becomes obvious. The 83/100 reflects a genuinely best-in-class developer experience held back from a higher score by the surcharge stack and the still-young support organization.
@polar-sh/better-auth plugin maintained by the Polar team. It auto-creates Polar customers from Better Auth signups, exposes a checkout helper, and provides a customer portal for subscription management.SpaceX Strikes $60B Option Deal to Acquire Cursor — Preempting Anysphere's $2B Fundraise (April 2026)
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