Mercury Overtakes Brex With Banking
Brex
Mercury won the opening move because banking sits earlier in the startup lifecycle than spend software. A founder needs an operating account, ACH, wires, and a debit card before they need policy controls or procurement workflows, so Mercury could become the system where cash lands first, then layer on cards and finance automation. Once the bank account is primary, adding Mercury IO made the rest of the spend stack easier to attach inside the same screen.
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Brex started with a free corporate card and built outward into cash, bill pay, and software. Mercury came from the other direction, starting with fast online business banking, then adding debit, treasury, venture debt, bill pay, expense tools, and a credit card. That made Mercury the default choice for day 1 companies and pushed Brex into catch up mode on banking.
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The practical workflow advantage is simple. Payroll, investor wires, vendor ACH, and card spend can all originate from the same Mercury balance. Finance teams do not have to move money from an external bank into a separate card product just to start spending, which reduces friction and makes card adoption more natural.
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The revenue models show the strategic difference. Mercury monetizes mainly from deposits, then cards and software, while Brex historically monetized mainly from interchange, with deposits and SaaS added later. In 2023, Brex was already moving toward a more Mercury like mix, with deposit revenue growing sharply after SVB and the company competing more directly for the all in one SMB finance stack.
The market is moving toward one finance home screen per business. Mercury is extending its banking lead into software, while Brex has responded by broadening into business accounts and enterprise controls. The company that best combines where money is stored, where it moves, and how it is approved will keep pulling more of the startup back office into a single product.