How FDIC Insurance Works on Business Checking
Fintechs, Sweep Networks, Partner Banks

Yes, with important nuances. Standard FDIC coverage is $250,000 per depositor per insured institution. For fintech accounts (Mercury, BlueVine, Relay, Novo, Found), FDIC coverage is extended through partner banks and, in some cases, through sweep networks that distribute your deposits across multiple FDIC-insured banks. Mercury Vault extends coverage to $5M via IntraFi partner banks. BlueVine extends to $3M via Coastal Community Bank plus 17 IntraFi banks. Relay extends to $3M via Thread Bank's 20-bank sweep. Chase, BofA, and Wells Fargo are single banks with the standard $250k cap.

A sweep network (like IntraFi, formerly CDARS and ICS) is a system that automatically distributes your deposits across multiple FDIC-insured member banks, each holding up to $250,000. From your perspective, you have one account at one institution. But your deposits are legally held across many banks, each insured separately. Mercury uses this via their Vault product to reach $5M. BlueVine uses it with Coastal Community Bank and 17 partner banks to reach $3M. Each bank in the network holds a piece of your balance, each covered by $250k FDIC individually.

Mercury checking and Vault are FDIC-insured (up to $5M via sweep). Mercury Treasury is a completely different product: a money-market fund held through Morgan Stanley and Vanguard that is SIPC-covered, not FDIC-insured. SIPC covers brokerage accounts against broker failure up to $500,000 (including $250k cash). It does not protect against investment loss -- though prime money-market funds are extremely low-risk and have only once broken the $1 NAV in history. If you need FDIC certainty, use Mercury Vault, not Mercury Treasury.

In 2024, Synapse Financial Technologies (a banking-as-a-service middleware layer) collapsed. Some customers of Yotta (a savings app built on Synapse) found their funds temporarily inaccessible while courts determined reconciliation between Synapse's ledger records and the actual bank records at Evolve Bank & Trust. The key lesson: passthrough FDIC insurance is only as reliable as the recordkeeping between the fintech and its partner bank. If records diverge, customers may face delays in fund recovery even if FDIC ultimately covers the amounts. Mercury, BlueVine, and Relay all have direct relationships with their partner banks and are not middleware-layer fintechs like Synapse, which reduces this specific risk.

Under $250k in any account: standard FDIC at any institution covers you -- even Chase. Between $250k and $3M: BlueVine Premier, Relay, or Mercury Vault all provide adequate coverage in a single account. Between $3M and $5M: Mercury Vault specifically extends to $5M. Above $5M: you need either a treasury policy with multiple institutions, an ICS/CDARS account at a traditional bank, or a CFO-managed treasury operation. Many funded startups at Series B and above have treasury teams that manage this explicitly.

Yes, for the vast majority of businesses. The fintech accounts on this list (Mercury, BlueVine, Relay, Novo) are not banks -- they are technology companies -- but your deposits are held at FDIC-insured partner banks. As long as the fintech's recordkeeping accurately reflects your balance at the partner bank (which all reputable fintechs maintain), your funds are protected. The risk scenario is a middleware failure like Synapse, which Mercury, BlueVine, and Relay do not use. A reasonable risk-management approach for larger balances is splitting across two fintech providers with different partner banks.