Mercury vs. Relay vs. Brex

You have completed the legal formation of your U.S. company. Your formation documents are approved, your Employer Identification Number (EIN) has been issued, and a Registered Agent has been appointed. At this stage, however, your company is not yet operational in practice. Without a U.S. business bank account, most founders are unable to invoice customers, pay vendors, or process payroll. Banking is important for all startups.

For many modern founders—particularly remote teams and non-U.S. entrepreneurs—opening a traditional business bank account can be challenging. Large legacy banks such as JPMorgan Chase, Bank of America, and Wells Fargo generally require in-person identity verification for new business accounts and may apply enhanced due-diligence standards to accounts involving non-resident owners. While these institutions do not prohibit foreign founders, their onboarding processes are often impractical for fully remote businesses.

As a result, a growing portion of startups and small businesses rely on financial technology platforms rather than traditional branch-based banks. Among these, Mercury, Relay, and Brex are three of the most widely used options in 2026. Although they are often discussed together, these platforms are designed for different business profiles. Selecting an unsuitable provider can lead to application delays, rejection, or account limitations after approval.

What follows is a comparative overview intended for technology startups, e-commerce businesses, and distributed teams operating in 2026.

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1. Mercury: A Common Choice for Technology-Focused Startups

Mercury is frequently used by venture-backed startups and software-driven companies seeking a digital-first banking experience. Its platform is designed to support companies that operate without physical offices and rely on online financial workflows.

Remote and Non-U.S. Founder Access

Mercury does not require a U.S. Social Security Number (SSN) from founders and generally permits fully remote account applications. Non-U.S. founders may apply using a valid foreign passport, an EIN, and approved U.S. entity documents. All applications are subject to identity verification, sanctions screening, and risk review, and approval is not guaranteed.

Cash Management and Yield Products

In addition to standard checking accounts, Mercury offers optional cash management products that allow eligible businesses to earn yield on idle funds. These products may involve investments in U.S. government securities or money market instruments and are not bank deposits. As such, they are not covered by FDIC insurance.

Deposit Insurance Structure

Mercury partners with FDIC-insured banks and offers a deposit sweep program that distributes funds across multiple institutions. This structure may provide FDIC insurance coverage above the standard $250,000 limit, subject to program terms, allocation mechanics, and regulatory limits.

Fees

At the time of writing, Mercury does not charge monthly maintenance fees or minimum balance requirements for its core accounts. Fee schedules are subject to change and should be reviewed directly with the provider.

Best suited for:
Technology startups, venture-backed companies, and international founders seeking a remote-first banking platform designed for high-growth businesses.

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2. Relay: Operational Banking for LLCs and E-Commerce Businesses

Relay positions itself as a banking platform for small businesses that prioritize operational clarity, internal controls, and cash-flow visibility. It is commonly used by bootstrapped companies and online sellers.

Multiple Checking Accounts

Relay allows businesses to open multiple checking accounts under a single legal entity. This feature is often used to segregate funds for taxes, payroll, operating expenses, and reserves. Availability and limits may vary based on account review and compliance considerations.

User Permissions and Spend Controls

Relay provides role-based access controls that allow business owners to assign different permission levels to team members, contractors, or bookkeepers. Debit cards can be issued with predefined spending limits, and access can be modified without sharing primary account credentials.

Accounting Integrations

Relay integrates directly with accounting platforms such as QuickBooks Online and Xero. These integrations allow transaction data to sync automatically, which can reduce manual reconciliation work. The accuracy of accounting records remains the responsibility of the business owner.

Fees

Relay generally advertises no monthly account fees and no minimum balance requirements for its standard offerings, subject to change.

Best suited for:
Multi-member LLCs, e-commerce sellers, service businesses, and founders who want structured cash management without venture-capital requirements.

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3. Brex: Spend Management for Funded and High-Revenue Companies

Brex operates primarily as a corporate spend management platform rather than a traditional bank. Over recent years, the company has narrowed its focus to funded startups and established mid-market businesses.

Eligibility Criteria

In 2026, Brex typically requires applicants to demonstrate meaningful operating revenue, institutional venture funding, or both. Early-stage or bootstrapped businesses may not meet approval criteria.

Rewards and Expense Tools

For eligible companies, Brex offers corporate cards with rewards programs that may include points or credits for software subscriptions, travel, and business services. Redemption options and reward rates are subject to program terms.

Support and Platform Features

Brex provides expense management, card controls, and travel-related tools within a single platform. Support availability and response times may vary based on customer tier and service level.

Best suited for:
Venture-funded startups and high-revenue companies seeking integrated expense management and corporate card rewards.

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2026 Feature Comparison Overview

Feature Mercury Relay Brex Primary Audience Tech startups LLCs & e-commerce Funded & mid-market Monthly Fees None (as advertised) None (as advertised) None (as advertised) Remote Onboarding Generally available Generally available Selective FDIC Insurance Via sweep program Via partner banks Via partner banks Multiple Accounts Limited Extensive Limited Rewards Programs Limited Minimal Advanced Compliance Review Moderate Moderate High

All features are subject to provider policies, regulatory requirements, and change over time.

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Compliance Consideration: Business Address and KYC Review

All U.S. financial institutions are required to comply with Know Your Customer (KYC) and Anti-Money Laundering (AML) regulations. One of the most common sources of application review delays or rejection is the principal business address provided during onboarding.

Registered Agent Addresses

Registered Agent addresses are publicly known and widely used. Many banks and fintech platforms recognize these addresses and may flag applications that list them as the company’s principal place of business. This does not automatically result in rejection but often triggers additional review.

Address Best Practices

• U.S. residents typically use their residential address as the principal business location.
• Non-U.S. founders may list their foreign residential address as the signatory address, while providing a legitimate U.S. business address for the company.
• Some founders use commercial office or mailroom services that provide unique suite numbers. Acceptance of such addresses varies by institution and is not guaranteed.

Providing inaccurate or misleading address information may result in account denial or closure.

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Which Platform Should You Consider?

• Non-U.S. founders forming a first U.S. company: Mercury is often considered due to its remote onboarding process, subject to compliance review.
• U.S.-based LLCs and online businesses: Relay may be appropriate for founders seeking operational control and multiple accounts.
• Recently funded startups: Brex may offer advantages for companies with institutional backing and significant spend volume.

Each provider applies its own risk criteria, and no approval outcome is guaranteed.

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Note on Wise

Some founders also maintain a Wise Business account in addition to a U.S. fintech platform. Wise is an Electronic Money Institution (EMI), not a bank, and is commonly used for international payments and currency conversion at market rates. Wise does not replace a U.S. business bank account but may complement one for cross-border operations.

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This article is for informational purposes only and does not constitute legal, tax, or financial advice. Banking policies and regulatory interpretations may change, and founders should verify requirements directly with financial institutions before applying.

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