Banking & Finance
Mercury
Business banking for STR LLCs — free checking with deep accounting sync
Solid Option
Solid free LLC banking layer for U.S. STR operators — but not a property tool
From $0 • No free trial
Comparison
Mercury vs Brex
Pricing, pros and cons, and buyer-fit side-by-side. Pick the one that matches your operation — or see why neither should.
Banking & Finance
Brex
Corporate cards and spend management for incorporated businesses
Solid Option
A solid corporate card for incorporated STR companies — but not an STR tool
From $0 • No free trial
✓Editorial verdict
Which Should You Pick: Mercury or Brex?
Pick Mercury if you want a free LLC checking account with wires, API access, and accounting sync as your operating banking layer. Pick Brex if you're an incorporated STR management company that wants corporate cards with no personal guarantee, per-user expense policies, and ERP-grade sync into NetSuite or Sage Intacct on top of your existing bank.
Editorial perspective from the Mercury side; factual claims about Brex are drawn from its review.
Pricing Side-by-Side
Mercury
Full pricing →From $0 • No free trial
Mercury (Free)
$0/mo
- No account minimums or monthly fees
- No overdraft or account opening fees
- Free domestic and international USD wires (standard SHA)
Mercury Plus
$29.90/mo
- Invoice with ACH debit at $1/transaction
- Reimbursement for up to 20 users/month, then $5/additional active user
- Annual pricing $23.95/mo (15% discount)
Mercury Pro
$299/mo
- Invoice with ACH debit at $0/transaction
- Up to 250 active users, then $5/additional active user
- Annual pricing $239.90/mo (15% discount)
Brex
Full pricing →From $0 • No free trial
Essentials
$0/user/month
- Corporate cards with basic policy controls
- Expense management for startups and growing companies
Premium
$12/user/month
- Multiple, customizable expense policies
- AI-powered compliance audit detection
Enterprise
Custom pricing
- For global enterprises with custom needs
- Tailored controls and onboarding
Smart Card
Custom pricing
- Procurement-focused card program
- For companies that want to simplify procurement
What each tool does well — and where it falls short
What Mercury does well
Free core checking with no monthly fee or minimums
The pricing page advertises $0/mo with no account minimums, overdraft fees, monthly fees, or account opening fees — so the operating account behind your LLC costs nothing, and only optional invoicing/bill-pay tooling is a paid SKU.
Free USD wires plus multi-bank FDIC sweep up to $5M
NerdWallet's 2026 review confirms free domestic and international USD wires and a partner-bank sweep network providing up to $5M of FDIC coverage — useful for paying overseas cleaners and parking large reserves.
Native read/write API and direct accounting sync
Every Mercury account ships with API access and connects to QuickBooks, NetSuite, and Xero in a few clicks per the vendor's accounting-automations page, which pairs cleanly with monthly STR bookkeeping flows.
What Brex does well
No personal guarantee or personal credit pull
Brex's credit-card product page states 'Brex does not require a personal guarantee' and underwrites using business data like revenue and expense profile — useful for STR operators who don't want a property-LLC card tied to their FICO.
Free Essentials tier with full card and expense functionality
Brex's pricing page lists Essentials at $0/user/month, meaningful for early-stage STR operators who don't yet need Premium's customizable expense policies or AI compliance audit detection.
Named ERP integrations cover the STR finance stack
Brex's integrations directory lists Oracle NetSuite, QuickBooks Desktop, Sage Intacct, SAP Concur, Workday Financials ERP, and Xero — the same accounting stack STR finance leads typically already run.
Where Mercury falls short
Not a bank — sudden account closures documented across reviewers
NerdWallet 2026 notes Mercury is a fintech working with partner banks and that account closures without warning are a documented pattern across BBB, Trustpilot, and Reddit. A frozen account holding Airbnb/Vrbo payouts is a real operational risk.
No cash deposits and slow ACH timing flagged by users
Operators who collect cash for late checkouts, pet fees, or on-site upsells have no path to deposit those funds, and NerdWallet 2026 notes ACH transfer times can be slow.
U.S.-only and not built for short-term rental
Mercury's homepage names SaaS, ecommerce, agencies, VC funds, and crypto as target verticals — not vacation rental — and there is no channel manager, calendar, guest comms, or owner-statement module. It is a horizontal banking layer.
Where Brex falls short
Eligibility excludes most independent STR hosts
Nav's review states 'Sole proprietors, individual consumers, and unincorporated partnerships aren't eligible,' with funded startups typically needing a $50K minimum cash balance and self-funded businesses needing $1M+ in annual revenue.
Cash-back redemption is materially lower than headline multipliers suggest
Nav reports cash-back redeems at 0.6 cent per point versus 1 cent through Brex travel — so advertised 7x rideshare or 3x restaurant points only realize ~0.6% as cash for an STR operator not booking travel through Brex.
International payment friction for non-US portfolios
Brex restricts eligibility to U.S.-incorporated companies, and Capterra's review summary flags 'Limited currency support (USD only)' and 'High international payment fees' — a hard limit for operators with EU or LATAM units.
Which Should You Pick
Pick Mercury if
U.S.-incorporated STR operators running 1–50 listings under an LLC who need a no-fee business checking account that ingests PMS payouts and syncs to QuickBooks, Xero, or NetSuite for monthly bookkeeping.
Skip Mercury if
You are not a U.S. business entity, you need to deposit on-site cash, or you want a single integrated PMS+payments+banking stack.
Pick Brex if
Larger U.S.-incorporated STR management companies (LLC / S-corp / C-corp) on QuickBooks, Xero, NetSuite, or Sage Intacct that want corporate cards plus per-employee expense controls without a personal guarantee.
Skip Brex if
You're a sole-proprietor host, an unincorporated partnership, or below Brex's funding/revenue thresholds (Nav cites $50K minimum cash balance for funded startups and $1M+ revenue for self-funded businesses).
Where Mercury and Brex actually differ
- Core product: Mercury is a checking account with cards and wires; Brex is a corporate card and spend-management platform — Brex is not a bank account, so most operators use it alongside a checking account, not instead of one.
- Eligibility: Mercury opens accounts for U.S. business entities broadly; Brex excludes sole proprietors and unincorporated partnerships, with Nav citing $50K minimum cash for funded startups and $1M+ revenue for self-funded businesses.
- Pricing model: Mercury is flat $0 / $29.90 / $299 per company; Brex prices per user — $0 Essentials, $12/user/mo Premium — so a 5-seat finance team on Premium runs ~$60/mo.
- API access: Mercury exposes a documented OAuth2 read/write REST API (Transactions, ACH, Invoicing) on every account; Brex surfaces integrations primarily through Zapier, Workato, and Pipedream with no public developer REST API on its integrations page.
- Wires and FDIC: Mercury offers free domestic and international USD wires plus up to $5M FDIC sweep coverage; Brex is USD-only with high international payment fees per Capterra and up to a 3% FX markup per Nav.
Common objections
- Brex offers corporate cards with no personal guarantee — doesn't that beat Mercury?
- For card-based spend management, yes — Brex's no-personal-guarantee underwriting and per-user expense policies are stronger than Mercury's card stack, especially on Premium. But Brex isn't a checking account, so you still need somewhere to receive PMS payouts and pay vendors. Many operators run Mercury as the bank and Brex as the card program.
- I run NetSuite — isn't Brex the obvious pick?
- Brex's NetSuite, Sage Intacct, SAP Concur, and Workday integrations are deeper for spend data than Mercury's. Mercury also syncs natively to NetSuite, QuickBooks, and Xero for bank transactions, and its API supports custom finance automations — which is meaningful if your finance team builds rather than buys. The honest answer is they're complementary at this scale.
- I'm a sole-proprietor STR host — can I use Brex's free Essentials tier?
- No. Nav explicitly notes Brex doesn't underwrite sole proprietors or unincorporated partnerships regardless of tier. Mercury will open an account for a U.S. LLC even at one listing, which is why it's the realistic banking choice for independent hosts who haven't built out a finance team.
Keep Digging
Mercury
Solid free LLC banking layer for U.S. STR operators — but not a property tool
Brex
A solid corporate card for incorporated STR companies — but not an STR tool