Mercury vs Brex: US business banking for Indian founders

Mercury and Brex are not banks themselves - they are technology platforms partnering with FDIC-insured banks (Choice Financial Group and Evolve for Mercury; Column N.A. and others for Brex). Both offer business checking, USD wires, debit cards and integrations. The differences are in account-opening friction for foreign founders, treasury yield, credit-card capabilities and the type of customer each platform optimises for. Indian founders setting up Delaware C-Corps need to know the approval realities, not just the marketing.

Mercury has built a reputation for approving foreign-founded US C-Corps with non-resident directors, provided the entity is a real Delaware C-Corp or LLC with an EIN. The application asks for incorporation documents, EIN letter, founder ID, and a business description. Approval typically takes a few business days. Brex historically required US-based founders or significant US presence; it has loosened but remains stricter for India-only teams. For a founder fresh off Stripe Atlas or Firstbase formation, Mercury approves faster in most cases.

Mercury Treasury invests idle cash in US Treasuries and money-market funds via mutual funds offered by Vanguard and Morgan Stanley; current yields track short-term Treasury rates (around 4-5% as of recent rates). Brex Cash offers a similar yield via partner funds. Both are not FDIC-insured at the treasury layer but hold underlying Treasury exposure. Mercury's IO checking offers higher rates on certain balance tiers. Compare the actual yield net of fees on the day you onboard, not the marketed rate.

Brex's corporate card is its flagship product, with strong expense management, receipt capture, integrations with QuickBooks and Xero, and category-specific rewards (high multiples on software, travel and ride-share). Brex underwrites credit primarily on bank balance and cash flow, not on personal guarantee. Mercury launched a corporate card more recently with similar expense-management features but less mature rewards. For a startup spending heavily on AWS, software and SaaS tools, Brex's rewards can meaningfully offset costs. For a banking-only need, Mercury wins on simplicity.

Pick Mercury if: you are a foreign-founded startup needing fast US bank approval, you want clean banking without corporate-card complexity, and you value the developer-friendly API. Pick Brex if: you have US presence or can show meaningful US revenue, you need a strong corporate card with rewards and expense management, and you want bundled bill pay and AP workflows. Many founders open both - Mercury for banking, Brex for cards - once approved.

Will Mercury open an account for a foreign founder?
Yes, in most cases. Mercury approves foreign-founded US C-Corps and LLCs with valid incorporation documents, EIN, and founder ID. Approval typically takes a few business days. Reject reasons are usually missing documentation or sanctions-list concerns, not the founder's nationality.

Does Brex accept foreign founders now?
Brex has loosened its policies but remains more conservative than Mercury for founders without US presence. A US-based co-founder, US office, or initial US revenue helps the application. Foreign-only teams report mixed approval results.

Are deposits in Mercury and Brex FDIC-insured?
Checking deposits are FDIC-insured at the partner bank up to USD 250,000 per depositor, per bank. Through sweep networks, both can extend coverage to several million via multiple partner banks. Treasury balances are not FDIC-insured but hold government securities.

What is the yield on idle cash?
Both offer treasury products yielding around short-term Treasury rates (recent rates around 4-5%). The exact figure changes with Fed policy. Compare net yield after any fees on the day you fund the account.

Can I get a credit line from either?
Brex offers credit-card lines underwritten on cash balance, often higher than personal-credit-based cards. Mercury's IO Card offers similar credit. Neither offers traditional term loans; for that, look at Lendio, Bluevine or your bank.

Can I have both Mercury and Brex?
Yes, and many startups do. Mercury for primary banking and wires, Brex for the corporate card and expense management. There is no exclusivity. Manage by mapping flows to whichever account has the right capability.