Mercury vs Relay for startup banking

Last updated October 2026

Mercury and Relay both target startups and small businesses with fee-free (or low-fee) online banking, but they take different approaches. Mercury leans into venture-backed startups with treasury management and API access. Relay focuses on cash-flow budgeting with multiple checking accounts and tiered savings rates. This comparison breaks down pricing, features, and trade-offs so you can pick the right one.

Mercury

Mercury has become one of the default banking choices for venture-backed startups, and for good reason. There are no monthly fees, no minimum balance requirements, and no charges for domestic or international USD wires. For a startup that regularly pays contractors overseas or sends wire transfers to vendors, those free wires alone can save hundreds of dollars a month compared to traditional banks.

The FDIC coverage is notable. Mercury insures deposits up to $5M through its partner banks, Choice Financial Group and Column N.A. That is well above the standard $250K FDIC limit and higher than what most fintech competitors offer. For startups sitting on a fundraising round, that extra coverage provides meaningful peace of mind.

Mercury Treasury is the platform's yield product, offering approximately 4% APY on balances of $250K or more. The catch: standard checking and savings accounts earn nothing. If your balance is below the Treasury threshold, your money sits idle. This makes Mercury a better fit for startups with significant cash reserves than for bootstrapped businesses running lean.

The IO corporate card and API access round out the feature set. The API is particularly useful for startups building internal finance tools or automating bookkeeping workflows. Mercury applied for its own bank charter in December 2025, which, if granted, would give it more direct control over banking operations and potentially open the door to new products.

The main downsides are the lack of cash deposit options and the absence of physical branches. Customer support is email-only, which can be frustrating when you need an urgent issue resolved. For most software startups, these limitations are irrelevant. For businesses that handle physical cash or prefer picking up the phone, they matter.

Relay

Relay takes a different approach by centering its product around cash-flow management. The standout feature is the ability to create up to 20 separate checking accounts on even the free Starter plan. This is designed for Profit First-style budgeting, where you allocate revenue into distinct buckets for taxes, operating expenses, owner pay, and profit. If you run your business using that methodology, Relay is one of the few banks that makes it practical without spreadsheet gymnastics.

Relay's tiered pricing introduces some complexity. The Starter plan is free and includes the multi-account feature, but savings earn only 1.19% APY. The Grow plan at $30 per month bumps that to 1.87%, and the Scale plan at $90 per month (discounted from $120) reaches 3.21%. None of these rates compete with Mercury Treasury's approximately 4%, but they do apply to smaller balances without a $250K minimum.

FDIC coverage through Thread Bank extends up to $3M. That is solid, though $2M less than Mercury's ceiling. Relay offers both Visa debit and credit cards, and integrates with QuickBooks, Xero, and Gusto for payroll and accounting.

There are some rough edges worth knowing about. Thread Bank, Relay's partner bank, has been subject to a consent order, and some users have reported sudden account freezes. These freezes can lock you out of your operating funds without warning, which is a serious risk for any business. Mobile check deposits can also take 7 to 10 days to clear, which is slow compared to industry norms.

Wire transfers cost $5 to $8 depending on your plan, a minor expense but a notable difference from Mercury's free wires. On the support side, Relay offers phone support Monday through Friday from 9am to 8pm EST, which is a step up from Mercury's email-only approach.

How to choose

The decision comes down to what kind of business you run and how much cash you keep on hand.

Mercury is the stronger choice for venture-backed startups with significant cash balances. Free wires, $5M in FDIC coverage, ~4% APY on large balances, and API access make it well suited for companies that have raised funding and need a modern banking platform that scales with them. If you send international wires regularly, the savings over Relay (and over traditional banks) add up fast.

Relay is better for bootstrapped small businesses that want granular control over cash flow. The 20-account structure is a real differentiator if you follow Profit First or any envelope-style budgeting system. Relay's savings rates are modest but available without a $250K minimum, and phone support is a plus for owners who prefer talking to a person.

A few cautions apply to Relay. The reports of sudden account freezes tied to Thread Bank's consent order are concerning. Before committing, consider whether you can tolerate the risk of temporarily losing access to your funds. The slow mobile check deposit times may also be a factor if you receive paper checks regularly.

For most startups, especially those with venture funding or plans to raise, Mercury is the more polished and reliable option. For small businesses focused on budgeting discipline and willing to accept some trade-offs, Relay fills a niche that few competitors address.

FAQs

Is Mercury free?

Yes. Mercury charges no monthly fees, has no minimum balance requirements, and offers free domestic and international USD wires. There are no hidden costs for standard banking features.

Is Relay free?

Relay's Starter plan is free with no monthly fee. The Grow plan costs $30 per month and the Scale plan costs $90 per month (discounted from $120). Higher-tier plans unlock better savings APY and lower wire fees.

Which has better savings rates, Mercury or Relay?

Mercury Treasury offers approximately 4% APY, but only on balances of $250K or more. Relay's savings rates range from 1.19% to 3.21% depending on your plan, with no minimum balance requirement. If you have a large cash reserve, Mercury wins. If your balance is smaller, Relay provides yield that Mercury's standard accounts do not.

Does Mercury or Relay offer FDIC insurance?

Both do. Mercury provides up to $5M in FDIC coverage through its partner banks, Choice Financial Group and Column N.A. Relay provides up to $3M through Thread Bank. Neither is a bank itself; both use partner bank relationships to extend coverage beyond the standard $250K limit.

Can I deposit cash with Mercury or Relay?

No. Neither Mercury nor Relay supports cash deposits. Both are online-only platforms with no branch network. If your business handles physical cash, you will need a traditional bank account alongside either of these.

Does Relay really freeze accounts?

Some users have reported sudden account freezes, which appear to be connected to Thread Bank's consent order from regulators. While not every customer experiences this, the reports are frequent enough to be a consideration. Having a backup bank account is a reasonable precaution if you use Relay as your primary operating account.

Which is better for international payments?

Mercury is the clear winner here. International USD wires are free on Mercury, while Relay charges $5 to $8 per wire depending on your plan. If you regularly pay international contractors or vendors, the savings with Mercury are substantial over time.

Does Mercury have an API?

Yes. Mercury offers API access for programmatic banking, which is useful for automating transactions, pulling account data into internal tools, or building custom financial dashboards. Relay does not offer API access.

Can I use Relay for Profit First budgeting?

Relay is one of the best banking options for Profit First. Even the free Starter plan lets you create up to 20 separate checking accounts, so you can allocate revenue into distinct buckets for taxes, profit, owner pay, and operating expenses without maintaining separate bank relationships.

What kind of customer support does each offer?

Mercury provides email-based support. Relay offers phone support Monday through Friday from 9am to 8pm EST. If having access to a phone representative matters to you, Relay has the advantage. If you are comfortable with asynchronous communication, Mercury's email support is generally responsive.

Is Mercury getting its own bank charter?

Mercury applied for its own bank charter in December 2025. If approved, this would allow Mercury to operate as a bank directly rather than through partner bank relationships. The timeline for approval is uncertain, but it signals Mercury's long-term commitment to building a full banking infrastructure.

Which integrates better with accounting software?

Relay offers built-in integrations with QuickBooks, Xero, and Gusto. Mercury connects with various accounting tools as well and adds API access for custom integrations. For standard accounting workflows, both work fine. For custom or automated setups, Mercury's API gives it more flexibility.

See also

• Mercury vs Brex

• Mercury vs Chase for startups

• Best business bank account for startups

• Best business bank for freelancers

• Best fintech for small business