Mercury vs Brex: Key differences at a glance
What is Brex?
Brex is a US-based fintech platform that provides business accounts, corporate cards, spend management, bill pay, reimbursements, Treasury, travel, and finance automation.
Brex launched as a corporate card provider for US startups before expanding its finance platform. On April 7, 2026, Capital One completed its acquisition of Brex.
Brex Pros and Cons
What is Mercury?
Mercury is a finance platform that provides business banking services through partner banks. It offers startup-focused business accounts and payments for startups and growing businesses, including checking and savings accounts, company cards, bill pay, invoicing, expense management, accounting integrations, APIs, and Mercury Treasury.
Mercury also offers ecosystem features such as Mercury Raise for eligible startups and venture debt for qualifying businesses. Its free plan includes core business banking and finance features, while Plus and Pro plans add enhanced invoicing, workflow automation, and relationship management capabilities.
Mercury Pros and Cons
Brex vs Mercury: Features Comparison
Corporate cards
When comparing Brex vs Mercury, both platforms offer corporate card products that generally do not require a personal guarantee, subject to product eligibility and underwriting. Brex issues corporate cards based on your company's financial profile, with eligibility, credit limits, and repayment terms determined by underwriting and the selected payment structure. It provides advanced spend controls, approval workflows, category-based rewards, and supports physical and virtual cards for global teams, making it suitable for businesses managing employee spending at scale.
Mercury offers the Mercury IO charge card, which is underwritten using your Mercury balances, account activity, and underwriting rather than personal credit. Most eligible businesses can access IO with daily repayment, while maintaining at least USD $15,000 in Mercury balances may unlock higher credit limits and 30-day repayment. Eligible purchases earn 1.5% cashback, and businesses can issue physical and virtual cards with customizable spending limits and merchant restrictions.
Overall, Brex is better suited for businesses needing deeper spend controls and finance workflows, while Mercury IO is better suited for businesses prioritizing cash-underwritten corporate cards, modern business banking, and straightforward card management.
Expense management
Brex is built around spend management. It combines corporate cards with receipt capture, spend policies, pre-spend approval workflows, reimbursements, accounting automation, ERP integrations, and multi-entity controls. Finance teams can configure policy rules, approval chains, and exception reviews before expenses are approved.
Mercury takes a lighter approach. You can manage expenses, reimburse employees, collect receipts, synchronize transactions with QuickBooks, Xero, and NetSuite, configure spending limits and user permissions, and review transactions from one platform.
While Mercury generally fits businesses wanting expense workflows attached to their primary operating account, Brex generally provides deeper policy automation, approval controls, and multi-entity capabilities.
Treasury
Both platforms help businesses manage idle cash through investment-based Treasury products that are separate from their business deposit accounts and are not traditional savings accounts.
Brex separates its business account into Checking, Vault, and Treasury. Checking and Vault use partner-bank and sweep structures, while Treasury invests in money market funds. Treasury investments are not FDIC insured and are subject to investment risk, liquidity, fees, and market performance.
Mercury Treasury is a separate investment account available to eligible businesses with at least USD $250,000 in total Mercury deposits. It is not FDIC insured and is subject to investment risk, advisory fees, liquidity terms, and variable returns.
International payments
In the Mercury vs Brex comparison, Brex supports international card spending, local currency wires, and cross-border payments. International capabilities vary by plan, with Premium and Enterprise plans providing features such as multi-entity support and local card issuance in supported markets. Foreign-currency card transactions may incur FX markups of up to 3%, depending on the card product and transaction type.
Mercury focuses on international payments rather than multi-currency banking. Businesses can pay vendors in 40+ local currencies or send non-USD international wires, which incur a 1% currency conversion fee. Non-USD card transactions may incur fees of up to 3%. However, Mercury does not provide multi-currency business accounts for holding foreign-currency balances or local account details.
Deposit protection and account structure
Neither Brex nor Mercury is a bank. Both are fintech companies that provide banking services through partner banks, and deposit accounts, sweep programs, and Treasury products have different protections.
Brex uses partner-bank sweep programs. Eligible deposits may receive FDIC insurance, subject to program terms, while Treasury is a separate investment product and is not FDIC insured.
Mercury provides banking services through Choice Financial Group and Column. Eligible deposits may receive FDIC insurance through partner-bank and sweep programs, subject to program terms, while Mercury Treasury is not FDIC insured.
Reward Point
Brex offers one of the strongest rewards programs among startup finance platforms, with eligible purchases earning up to 7x points depending on the spending category. Rewards can be redeemed across travel and other supported options, making them attractive for companies with recurring software and travel expenses.
Mercury takes a simpler approach through Mercury IO, offering eligible businesses up to 1.5% cashback instead of category-based reward points. This eliminates the need to manage different reward tiers.
Integration
Brex integrates with major ERP, HRIS, accounting, payroll, travel, and procurement systems. It also provides APIs that support ERP customization, custom integrations, finance workflow automation, and multi-entity operations, with some advanced capabilities depending on the selected plan.
Mercury integrates with accounting platforms such as QuickBooks, Xero, and NetSuite while also offering APIs, webhooks, and automation tools for banking workflows. These integrations support transaction synchronization, reconciliation, accounting automation, and financial reporting for growing businesses.
Brex vs Mercury: Pricing Comparison
Choosing between Brex vs Mercury isn't just about the monthly subscription cost. As your business grows, pricing also determines which finance workflows, approval controls, and automation tools you'll have access to without adding separate software.
Both platforms offer free entry-level plans, but they take different approaches. Mercury includes most of its business banking capabilities in its free plan, while Brex's paid plans focus on expanding spend management, multi-entity operations, and finance automation.
Note: Mercury Plus and Pro pricing depend on the selected monthly or annual billing option. This table reflects the pricing displayed at the time of review (3 August 2026). Also, the price is subject to change. Please verify from the official page.
Which business banking is better for startups: Brex or Mercury
Choosing between Brex vs Mercury depends on your startup's stage and finance needs, such as business banking, spend controls, APIs, Treasury, and international requirements.
Choose Mercury when
- Your primary operating account is the priority.
- Free core business banking and payments meet your needs.
- APIs and banking automation are important.
- You want access to Mercury Raise and other startup ecosystem resources.
- Expense management requirements remain relatively straightforward.
For example, many pre-seed, bootstrapped, SaaS, and ecommerce startups may find Mercury sufficient when business banking and payment workflows are their primary focus.
Choose Brex when
- Corporate cards, approval workflows, and spend policies are central to your finance operations.
- Accounts payable (AP) automation and policy controls are important.
- Your business manages global teams or multi-entity operations.
- ERP, HRIS, and enterprise integrations are required.
- Paid finance automation is justified by your operational complexity.
For example, startups, growing SaaS companies, and businesses with dedicated finance teams may benefit from Brex's deeper spend management capabilities.
Compare both carefully when
- Treasury products are an important part of your cash management strategy.
- You need both business banking and advanced spend management.
- International payment, card, and account requirements are mixed.
- Your business may benefit from using more than one finance provider.
Aspire: A Brex and Mercury alternative
While Brex and Mercury are strong options for US business banking, businesses operating across multiple markets may also consider Aspire¹. Aspire supports cross-border finance with a US Deposit Account, supported non-USD accounts*, international payments, corporate cards2, spend controls, and Treasury products. Some products are provided through different Aspire entities and are subject to eligibility.
Aspire may fit when you:
- Need a US Deposit Account together with supported non-USD accounts*.
- Make frequent international supplier or contractor payments in 98+ currencies.
- Need virtual US commercial charge cards with spend controls and 1.5% uncapped cashback^ on eligible spend.
- Want integrated accounting and AP workflows for cross-border operations.
- Want to invest idle cash through Aspire Treasury, which has no minimum investment, while understanding that returns are variable and Treasury is not FDIC insured.
Final verdict
Brex and Mercury both offer modern finance tools for startups, but they prioritize different business needs. Brex is generally a stronger fit for companies that prioritize corporate cards, spend controls, accounts payable (AP) workflows, global finance operations, and enterprise integrations. Mercury is generally a stronger fit for businesses that prioritize a startup-focused operating account, payments, banking APIs, and straightforward finance workflows.
Both platforms now overlap across business accounts, cards, expense management, Treasury, and accounting integrations, so your decision should depend on eligibility, workflow requirements, international operations, and the level of finance automation your business needs.
If your business also requires supported non-USD accounts and broader cross-border capabilities, you may also compare Aspire alongside Brex and Mercury.
.jpeg)