Mercury and Brex are two of the most widely used business banking platforms among U.S.-based technology startups. Both offer business checking accounts, corporate cards, and spend management tools — but they differ in eligibility requirements, credit limit mechanics, and platform focus.
This comparison documents how each product is structured, what it costs, and where the constraints lie. Both products are reviewed symmetrically.
At a glance
- Mercury: Open to a broad range of U.S. businesses including pre-revenue startups and sole proprietors.
- Brex: Requires venture capital funding, $50K+ in a Brex account, or enterprise revenue qualification.
How the products compare structurally
| Dimension | Mercury | Brex |
|---|---|---|
| Banking partner | Evolve Bank & Trust, Choice Financial Group | LendingClub Bank |
| Bank charter held | No | No |
| FDIC insurance | Up to $5M via sweep | Standard $250K; expanded via partner network |
| Corporate card type | Charge card | Charge card |
| Credit limit basis | Deposit balance | Funding round or capital position |
| Spend management | Basic | Full (Brex Empower) |
| Monthly fees | None (standard) | None (standard) |
| International wires | Yes (fee applies) | Yes (fee-free at standard tier) |
| Eligibility floor | Open to most U.S. businesses | VC-backed, $50K+ deposit, or enterprise |
How each product is structured
Mercury
Mercury provides a business checking account, savings, a charge card (Mercury IO), and a treasury product under a single dashboard. Deposits are held through two partner banks, with sweep-based FDIC coverage extending up to $5 million for qualifying accounts.
The charge card’s spending limit is set as a fraction of the average balance in the linked Mercury deposit account. Businesses with limited cash but high spending needs may find this creates a ceiling.
Mercury is accessible to pre-revenue startups, non-U.S. founders with U.S.-incorporated companies, and sole proprietors. The standard tier has no monthly fee.
Brex
Brex provides a business deposit account through LendingClub Bank and a connected spend management platform called Brex Empower. The deposit account supports standard banking operations. Empower handles corporate cards, expense policies, employee reimbursements, budget enforcement, and accounting integrations.
Brex’s charge card limit is evaluated based on the company’s funding and capital position. For venture-backed startups, limits are typically tied to the funding round size. This structure can provide higher limits than a deposit-balance model, but requires meeting the eligibility threshold first.
Fees and pricing mechanics
Both Mercury and Brex offer fee-free standard checking accounts with no monthly charges or minimum balance requirements.
Mercury charges approximately $25 per outgoing international wire at the standard tier. Brex waives domestic and international wire fees at its standard Business Account tier.
Mercury offers paid tiers at $35/month (Plus) and $350/month (Pro) for advanced features. Brex charges per-user for its Premium tier, with pricing negotiated for enterprise clients.
Both platforms earn interchange revenue from corporate card spending. Mercury returns cashback as a straight rebate. Brex distributes rewards points redeemable for travel, statement credits, or partner program transfers.
Limits, eligibility, and availability
Mercury is available to the full spectrum of U.S. businesses from sole proprietors to funded startups. Non-U.S. founders with Delaware-incorporated companies can also apply. Application is fully digital with typical approval in one to three days.
Brex requires the business to meet one of three criteria: be venture or private equity-backed, maintain $50,000 or more in a qualifying account, or qualify as an enterprise buyer. Businesses that do not meet these thresholds are ineligible. This threshold was established when Brex discontinued small business service in 2022.
Both platforms operate digitally with no branch presence. Customer support for both is primarily asynchronous, with higher-tier plans providing faster response and in some cases dedicated account management.
Tradeoffs and constraints
Mercury’s broader eligibility means it serves a wider population of businesses, including those at very early stages. The tradeoff is that the platform’s spend management tools are simpler than Brex’s, and the charge card limit is constrained by the deposit balance.
Brex’s stronger eligibility floor means deeper spend management capabilities but excludes businesses that are too early or too small. The expense management tooling in Brex Empower is more robust, particularly for companies with dedicated finance teams managing multiple cost centers.
For companies evaluating both: Mercury is typically accessed first, often during incorporation or early-stage operations. Brex is typically adopted after fundraising, when a company’s capital position qualifies for it and the spend management complexity justifies the switch.
See also: Ramp Review for an alternative corporate card and spend management platform.
