Mercury

Mercury is banking built for startups. Not "banking with a startup aesthetic" — the product decisions genuinely follow from who it serves: companies incorporated in the US, often venture-backed, often founded by people who are not resident there, holding a cash balance they need to spend deliberately over a runway.

What Mercury actually is

• Business checking and savings — operating accounts for US-incorporated companies, provided through partner banks.
• Cards — debit and charge cards with limits and controls for team spend.
• Payments — domestic transfers, wires and international payments, with an API for programmatic movement.
• Treasury — options for holding idle cash beyond a plain operating balance, documented with their own terms and risk profile.
• Finance operations — bill pay, invoicing, accounting integrations and multi-user permissions.

Why startups choose it

Three reasons come up repeatedly, and all are structural rather than cosmetic. First, onboarding: Mercury documents support for US-incorporated companies with non-resident founders, which traditional branch-based onboarding handles poorly. Second, the account model fits how startups actually operate — multiple sub-accounts, granular user permissions, virtual cards per vendor, clean exports for the accountant and the investor update. Third, the API: finance teams can automate payments and reconciliation instead of exporting CSVs.

Deposit arrangements — read this carefully

Mercury is a fintech, and the deposit relationship sits with partner banks. That structure has practical consequences worth understanding before you park a funding round there: which institution holds the funds, how insurance coverage is described and how it is achieved across partner banks, and what happens operationally if a partner relationship changes. Mercury documents all of this publicly.

We deliberately state no coverage figure here, because those terms are updated and are conditional on how the programme is structured. Read the current disclosures, and if you hold a large balance, treat allocation as an explicit treasury decision rather than a default.

Treasury and idle cash

Mercury offers ways to hold cash beyond a plain operating balance. These products are not equivalent to a bank deposit: they carry their own risk profile, terms and, in some cases, market exposure. That is not a reason to avoid them — it is a reason to read the documentation and, above a meaningful balance, to get an answer from your accountant rather than from a marketing page.

Where Mercury is limited

Its focus is also its constraint. Eligibility is oriented around US-incorporated entities, so a UK, EU or other locally incorporated company generally needs a different provider. Multi-currency holding and FX are not the product's centre of gravity in the way they are for a multi-currency-first account. And, as with any digital-first provider, escalation during a compliance review is a documented process rather than a phone call to a manager who knows you.

Pricing

Mercury publishes its account and plan structure, including paid tiers that add finance-operations capability, alongside charges for certain payment types. Terms change. We do not reproduce figures — check Mercury's official pricing page and fee schedule for the current position.

Where it fits

• US-incorporated startups, including those with non-resident founders.
• Venture-backed companies managing a runway and wanting visibility over spend.
• Finance teams that automate — the API and permissions model are genuine differentiators.
• Companies replacing a legacy bank whose onboarding and software they have outgrown.

Where it does not fit

• Companies incorporated outside the US — check eligibility before evaluating features.
• Businesses whose core need is holding many currencies and converting cheaply.
• Cash-handling businesses needing branch deposits.
• Companies requiring lending relationships that traditional banks provide.

Independent verdict

For a US-incorporated startup, Mercury is one of the easiest banking recommendations to make: the onboarding, permissions, cards and API match how modern companies run finance, and the software is better than what incumbent banks ship.

The care required is on the deposit and treasury side, not the product side. Understand where your money actually sits, read the current disclosures, and split large balances deliberately.