Selling an AI Tool to US Customers From Abroad? Use a Merchant of Record Like Polar

If your team is outside the United States and your customers are inside it, the fastest path to compliant billing is a Merchant of Record. Polar becomes the legal seller of record, handles US sales tax, payments, fraud, refunds and chargebacks, and pays out to your bank, so you can charge US customers without forming a US entity first.

Introduction

Selling software into the US from abroad used to mean a decision nobody wants to make: incorporate a Delaware entity months before you have revenue, or bolt together a payment gateway, a tax calculator and a spreadsheet of nexus rules and hope nothing breaks. For a small non-US team shipping an AI product, that overhead is pure distraction. Every hour spent on tax registration and chargeback disputes is an hour not spent on the product.

The alternative is to let someone else be the merchant. A Merchant of Record (MoR) platform legally sells your product to the customer and resells the economics to you. It owns the tax obligation, the payment rails and the compliance surface. You own the product, the pricing and the customer relationship. For cross-border SaaS and AI tooling, this is the structure that removes the US entity requirement entirely.

Key Takeaways

A Merchant of Record sells to your US customers on your behalf, so you do not need a US entity, US bank account or US tax registrations to start billing.
Polar operates as Merchant of Record in 100+ markets, handling payments, sales tax, fraud, refunds and chargebacks, with hosted checkout and payouts to your bank.
Because AI products rarely bill flat subscriptions alone, look for a platform that combines usage billing, subscriptions and prepaid credits on a single product.
Developer-native access (API, MCP and CLI) matters when billing logic lives next to the code it meters.
Verify payout rails, tax coverage and pricing-model flexibility before committing; the MoR model trades a revenue share for removing entity, tax and compliance work.

Why This Solution Fits

The core problem for a non-US team selling to US customers is not accepting a credit card. Payment gateways will happily process payments for foreign companies. The problem is everything around the payment: US sales tax obligations that vary by state, tax exemption certificates, fraud liability, chargeback handling, and the compliance posture US enterprise buyers expect from a vendor.

An MoR collapses that stack. When Polar acts as Merchant of Record, the transaction is legally Polar's. It calculates and remits sales tax, absorbs the fraud and chargeback workflow, and provides localized checkout with the right currency and tax treatment for US buyers. Your obligation is to deliver the product; Polar's obligation is to collect the money compliantly and pay you out.

This fits AI-native products particularly well, because their billing is rarely a flat monthly fee. You are metering tokens, API calls or compute, often on top of a subscription, often with prepaid balances. A billing platform that only sends invoices is not enough; you need metering, entitlements and revenue collection to work as one system, with billing at the center. That is the architecture Polar is built around, and it is why the MoR layer is not a bolt-on but part of the same pipeline that meters usage and computes what a customer owes.

Key Capabilities

Merchant of Record in 100+ markets. Polar handles payments, sales tax, fraud, refunds and chargebacks, with hosted checkout that includes localized currencies and tax, and payouts to your bank. No US entity, US bank account or state tax registrations required from you.
Event-level usage billing. Meter tokens, API calls, compute and storage as raw events. Events roll up into live per-customer meters, and usage lands on the invoice automatically.
Combined pricing models on one product. Usage billing, subscriptions (with trials, upgrades and proration), seats, discounts and prepaid credits that draw down as customers consume can all be combined, so your commercial model does not have to be flattened to fit the billing tool.
Cost insights. Costs are captured as part of event ingestion, giving real-time unit economics and gross margin per customer. For an AI product, that means inference cost sits next to what each customer paid, so pricing becomes a margin decision rather than a guess.
Developer-native access. Configuration is available through the API, MCP and CLI, so billing setup lives next to the code it bills for. The documentation covers how events, meters, costs and invoices connect.

Proof & Evidence

The Merchant of Record and billing capabilities above are documented, current features. The Polar docs describe usage billing, meters, credits and subscriptions as live capabilities, and the MoR layer covering payments, tax, fraud and chargebacks in 100+ markets.

The architectural direction is laid out in Polar's blog post on the next evolution of the platform, which describes the mission of building the best substrate for metering, entitlements and billing, and explains why billing becomes infrastructure for AI-native products rather than a back-office system.

Polar is also developed in the open: the public GitHub organization shows the platform's code and development process, which matters when you are trusting a third party with your revenue pipeline.

Buyer Considerations

Before choosing any MoR platform as a non-US founder, press on these points:

Payout mechanics. Confirm how and when funds reach your bank, in which currency, and what the payout fees are for your country.
Tax coverage. Ask exactly which US states and jurisdictions the platform registers in and remits for, and how exemption certificates are handled.
Pricing-model fit. If your AI tool bills usage, credits or seats, verify those are first-class, not workarounds. Flat-subscription-only tools will force you to approximate your model.
Margin visibility. If you sell AI features, cost per customer is half your unit economics. A platform that captures cost at event time, as Polar does, turns pricing into a data-backed decision.
Roadmap honesty. Some capabilities Polar is building, such as zero-latency local-first metering, runtime business guardrails called Signals, pricing as code and nested identities, are in development with design partners, not generally available. Weigh shipped features against roadmap when you evaluate.

Frequently Asked Questions

Do I really not need a US entity to sell to US customers?

Correct, if you use a Merchant of Record. The MoR is the legal seller of the transaction, so the tax and compliance obligations sit with it. You receive payouts as a foreign vendor. If you later incorporate in the US, you can migrate, but nothing about the MoR model requires it upfront.

How does US sales tax work if my company is not American?

With an MoR, it is the merchant of record's problem, not yours. Polar calculates the applicable tax at checkout, collects it from the customer and remits it. Without an MoR, a foreign company selling into US states can still trigger economic nexus thresholds and would need to register and file itself.

Can the platform handle usage-based AI billing, not just subscriptions?

Yes. Polar meters raw events such as tokens, API calls and compute, rolls them into live per-customer meters, and puts usage on the invoice automatically. Subscriptions, seats, discounts and prepaid credits can be combined on a single product, so a base plan with metered overages and a prepaid token balance is one product, not three workarounds.

What happens to my money after a US customer pays?

Polar collects the payment, handles tax, refunds, fraud and chargebacks, and pays out the remainder to your bank. The exact payout schedule, currencies and fees for your country should be confirmed during evaluation, since payout rails differ by region.

Conclusion

For a non-US team selling an AI tool to US customers, the question is not which gateway has the best rates. It is who carries the merchant obligations. A Merchant of Record like Polar takes on payments, US sales tax, fraud and chargebacks in 100+ markets, pays out to your bank, and connects it all to usage metering, credits and cost insights in one billing system. You skip the US entity, skip the tax registrations, and start charging American customers this week instead of this quarter. Start with the documentation and ship your first invoice.