Choosing between a Mercury business bank account and Relay is one of the first practical decisions Korean founders face after forming a US LLC or corporation. Both are fintech banking platforms popular with startups and remote entrepreneurs because they let you open a US business account online, often without traveling to the United States. This comparison breaks down what each offers, where they differ, and how to pick the right fit for your remote setup.
What These Fintech Platforms Actually Are
Neither Mercury nor Relay is a traditional bank. They are financial technology companies that partner with US chartered banks to provide accounts, and customer deposits are typically held at those partner banks with FDIC insurance passed through. The practical benefit for founders is a clean, digital-first experience: online applications, modern dashboards, virtual and physical cards, and easy integrations with tools like accounting software and payment processors.
For non-residents, this model is a major advantage. Legacy US banks usually require an in-person visit to open a business account, which is a real barrier when you are based in Korea. A Mercury business bank account or a Relay account can often be opened entirely online with your US entity documents, an EIN, and identity verification.
Mercury: Built for Startups and Scale
Mercury is widely used by technology startups and e-commerce sellers. Its strengths include a polished interface, free domestic and international USD wires in many cases, virtual cards you can issue instantly, and features aimed at growing companies such as multiple sub-accounts and treasury options for larger balances. Mercury also integrates smoothly with Stripe, PayPal, QuickBooks, and similar tools, which matters when you are wiring together a full US operation.
For funded startups, Mercury offers additional products layered on top of the core account. If you plan to raise capital, work with US investors, or scale quickly, the platform is designed to grow with you. Opening a Mercury business bank account generally requires a US LLC or C corporation, an EIN, formation documents, and beneficial owner verification. Some business types and jurisdictions may face additional review, so it helps to have clean, consistent paperwork.
Relay: Cash Flow Management and Multiple Accounts
Relay takes a slightly different angle, focusing on cash flow management and bookkeeping-friendly workflows. Its signature feature is the ability to open multiple checking accounts under one login, which supports budgeting methods where you separate money into buckets for taxes, payroll, operating expenses, and profit. This is appealing to founders who want structured control over their finances rather than a single pooled account.
Relay also emphasizes team access with role-based permissions, so you can give a bookkeeper or partner limited visibility without sharing full control. It integrates well with accounting platforms and is often favored by service businesses and agencies that value organized cash flow over startup-specific features. Like Mercury, Relay requires your US entity documents, an EIN, and owner verification to open an account.
Mercury vs Relay: Key Differences
Both platforms cover the essentials, so the right choice depends on how you operate. Consider these points:
- Best fit: Mercury leans toward startups, e-commerce, and companies planning to scale or raise funding. Relay leans toward disciplined cash flow management and multi-account budgeting.
- Wires and payments: Both support domestic and international USD payments. Mercury is known for generous wire handling, while Relay covers standard ACH and wire needs with a budgeting focus.
- Multiple accounts: Relay makes opening several sub-accounts a core feature. Mercury also supports sub-accounts but frames them differently.
- Team access: Relay offers granular role-based permissions that bookkeepers appreciate.
- Fees: Both offer no-monthly-fee tiers, but specific charges for wires, expedited cards, or premium plans vary and change over time, so confirm current pricing before deciding.
Many founders even open both over time: one as a primary operating account and another for a specific purpose. There is no rule that you must pick only one.
How to Choose for a Remote Setup
Start with your business model. If you are launching a product startup, selling on Amazon, or expect to seek investment, Mercury often maps cleanly to that path. If you run a service business and want to separate funds for taxes and expenses with clear structure, Relay may feel more natural. Then check current approval requirements, because both platforms periodically update which entity types and owner nationalities they can onboard.
Whichever you choose, prepare a complete document package: formation certificate, EIN confirmation letter, an operating agreement or bylaws, and clear identity documents for every beneficial owner. Consistent information across your entity, bank application, and payment processors reduces delays and review flags. It also helps to have your business website and a short description of your model ready, since some applications ask what you sell and how you make money before approving the account.
This article is general information, not legal or tax advice. Fintech features, fees, and eligibility change frequently, so review the current terms and consult a qualified professional before opening an account.
Frequently Asked Questions
Can non-residents open a Mercury business bank account?
Many non-resident founders open a Mercury business bank account under a US LLC or C corporation using an EIN and formation documents. Eligibility depends on your entity type and current policies, so verify the latest requirements when you apply and prepare complete owner verification.
Is Mercury or Relay safer for my deposits?
Both hold customer funds at partner banks that provide FDIC insurance passed through to depositors. Neither is a bank itself. The safety of your deposits comes from the underlying partner banks, subject to standard coverage limits and terms.
Can I use both Mercury and Relay together?
Yes. Some founders use one platform as the main operating account and the other for a specific purpose, such as separating tax reserves. There is no requirement to choose only one, though managing two accounts adds a little administrative overhead.
Not sure which fintech fits your US company? We help Korean founders form the right entity, obtain an EIN, and open remote-friendly business banking. Schedule a free consultation with USdongsan to set up your US banking the smart way.
