Mercury Business Banking vs Brex Business Account
Mercury and Brex both bank funded startups, both exclude no one on price, and both bolt a corporate card onto the account. The real split is what each does with your idle cash and how much platform you want attached to your bank.
| Mercury Business Banking | Brex Business Account | |
|---|---|---|
| APY | None on checking/savings; Mercury Treasury yields roughly 3.0-3.6% net ($250k minimum) | Treasury money market yields ~4.01% (up to 4.36% at $20M+); checking and Vault pay nothing |
| Monthly Fee | $0 (banking is free on every tier) | $0 (Essentials) |
| Minimum to Open | None | None (US-incorporated companies with an EIN only) |
| ATM Access | Fee-free at 55,000+ Allpoint ATMs; no Mercury fee elsewhere, but no cash deposits at all | No ATM or cash access; spend runs through Brex corporate cards |
| Insurance | FDIC insured up to $5 million through Choice Financial Group and Column N.A. plus partner sweep networks | Checking via Column N.A. ($250k combined across sub-accounts); Vault sweeps across ~24 program banks for up to $6 million FDIC; Treasury is a money market fund (not FDIC insured) |
| Our Rating | 9.0 | 8.5 |
Where Each Wins
Yield
BrexBrex Treasury yields roughly 4.01% with no minimum balance, tiering up to 4.36% at $20M+. Mercury Treasury pays a comparable 3.0-3.6% net but requires $250,000 across accounts before you earn anything.
FDIC coverage
MercuryMercury sweeps to $5 million in FDIC coverage on regular accounts. Brex checking stops at $250k, and reaching its $6 million Vault coverage means parking cash with a 1-2 day transfer lag, while the headline Treasury yield is a money market fund and not FDIC insured at all.
Fees and payments
TieBoth are free where it counts. Mercury includes free ACH, domestic wires, and USD international wires; Brex includes free same-day ACH, free domestic wires, and unlimited free checks.
Cards and spend platform
BrexBrex bundles corporate charge cards with points, travel booking, expense management, and bill pay on its free tier. Mercury's IO card at flat 1.5% cashback and built-in bill pay are good, but the spend platform is thinner.
Eligibility
TieBrex requires a US-incorporated company with an EIN and will not bank sole proprietorships. Mercury is built for startups and online businesses, so neither is the answer for an unincorporated side hustle.
Banking software
MercuryMercury's API access, up to 14 accounts, and overall product polish make it the better pure banking layer. Brex's architecture of checking, Treasury, and Vault is powerful but adds moving parts.
The Verdict
Pick Brex if maximizing yield on idle cash is the job. Its roughly 4% with no minimum beats anything Mercury pays until you have $250k to commit, and the card, travel, and expense platform comes free. Pick Mercury if you want the better primary bank: $5 million FDIC on regular balances, free USD international wires, and the cleanest banking software in the category. For most startups the honest answer is Mercury as the operating account, with Brex worth it when treasury yield is the priority.
Updated 2026-06-11
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