Mercury vs Brex, for an Indian-founder US entity.

Both Mercury and Brex solve the hardest problem for an Indian founder: opening a US business bank account without a US SSN, without physically visiting the US, and without a credit history. Both accept:

• Delaware or Wyoming LLC / C-Corp.
• Non-US-resident foreign founder as a 100% owner.
• Passport (plus national ID in some cases) as primary identification.
• Fully-remote onboarding.
• EIN-based tax identification for the entity.

Both route deposits through FDIC-insured partner banks (not themselves direct banks). Both offer wire transfers, ACH, international wires. Both have modern APIs and web dashboards built for software-founder workflow.

Mercury strengths:

• Mercury Treasury: idle balance over USD 500K earns Treasury-fund yield (4-5% range depending on Fed rate).
• IO (deposits insured sweep) extends FDIC coverage to USD 5M+ through sweep partners.
• Simple multi-currency setup for incoming payments.
• Open to earlier-stage, smaller-balance entities — low minimums.
• Developer-friendly API if you want to automate payouts or reconciliation.

Brex strengths:

• Corporate cards from day one — underwritten against entity cash balance, no personal guarantee.
• Spend management: receipt capture, policy enforcement, auto-categorisation, expense reporting.
• Travel booking and reimbursement integrated.
• Better fit for a team of 5+ with recurring expenses.
• Historically has had higher balance thresholds to maintain full feature access; this has eased recently.

Where Brex is weaker: Brex has periodically closed accounts of very-small-balance or earliest-stage founders to focus on larger customers. Mercury is more consistently open to pre-revenue founders.

Scenario 1: Pre-revenue founder, LLC just incorporated, USD 10K seed capital. Mercury. Easier approval, no card-approval friction (which Brex can gate), banking-only is sufficient at this stage.

Scenario 2: Seed-funded company, USD 1-5M in bank, hiring 5+ US contractors. Either works. Mercury for Treasury yield on idle balance; Brex for spend management across the team. Many founders use both — Mercury as primary deposit account, Brex for cards + spend management.

Scenario 3: Series A+, USD 5M+ balance, 20+ team members, international travel. Brex becomes the natural fit for spend management. Keep Mercury or Mercury Treasury as the deposit/yield account.

• Opening with incomplete entity documentation. Both platforms require Certificate of Incorporation / Formation + EIN + Operating Agreement / Bylaws + proof of address for the founder (utility bill, bank statement). Missing any element delays or blocks approval.
• Mismatched addresses. Delaware registered address + Indian founder residential address + any US virtual mailbox address must be consistent across the application. Discrepancies trigger KYC review.
• Early-stage founders applying to Brex before raising. Brex has intermittently declined pre-funded applicants. Start with Mercury; add Brex after first institutional round.
• Wire limits. Both platforms have outgoing international wire limits that scale with account history. For a USD 500K-plus outbound wire in month 1, pre-coordinate with the bank or expect a review.