Payments

Polar: pricing, API and MCP for AI agents

by Polar Software · polar.sh

Checked 2026-10-17 on Polar Software's own pages. Anything we could not confirm says “not verified”.

What is Polar? Open-source (Apache-2.0) merchant of record for digital products and subscriptions. A free plan at 5% + 50¢, and paid plans that swap a monthly fee for a lower per-transaction rate.

How an agent uses it: MCP server, SDKs and framework adapters documented on Polar's site.

Best for: Developers selling software or subscriptions who want an open-source merchant of record with fees that drop on higher plans.

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Pricing

Free tier
Starter: no monthly fee, 5% + 50¢ per transaction [source, checked 2026-10-17]
Entry paid price
Pro $20/month: 3.8% + 40¢; Growth $100: 3.6% + 35¢; Scale $400: 3.4% + 30¢ [source, checked 2026-10-17]
What you pay for (meter)
Monthly plan fee plus a per-transaction rate; +1.5% for non-US cards [source]
Data retention
not verified

List prices in USD as shown on the vendor page on the checked date; taxes, carrier and third-party fees can apply. Follow the source link before you buy.

For agents

API and SDKsAPI with SDKs, CLI and framework adapters [source]
MCP serverMCP server documented [source]
Open sourceApache-2.0 [source]
Compliancenot verified
Merchant of recordYes [source]

“not verified” means we did not find it on a vendor page; it may still exist. Send a correction with a source link through the submit form.

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Other payments tools: Stripe · Lemon Squeezy · Paddle

Vendors: want a labelled featured slot on AI agent tool pages like this one? Sponsorships are always marked “Sponsored” and never change table order, verdicts or facts. See placements and how to book.

Sources

Last checked 2026-10-17. Vendor links on this page are plain links. Data: agent-tools.json · agent-tools.csv (CC BY 4.0). Canonical: https://evalsreview.com/agent-tools/polar