Flex sells itself as an "AI-native private bank" for mid-market business owners — the ones running three to five entities across two or three countries, tens of millions in turnover, and zero appetite for figuring out why the corporate card just failed in Dubai. In four years the company went from a niche service for construction contractors to a platform with over $10 billion in annualised payment volume and a $1.2 billion valuation as of its July 2026 round.
What makes it interesting is the construction. Multi-currency accounts and cashback are offered by every second fintech today; Flex deliberately erases the line between company finances and the owner's own wallet — a personal card paying up to 5% cashback, priced off the volume the business pushes through the platform. For a Russian-speaking client with a US structure this is an intriguing tool and, at the same time, a set of hard gates on the way in.
Background
The company was founded by Zaid Rahman — a Thiel Fellow and Columbia dropout who previously launched the learning startup Volley. Legally it is Flexbase Technologies, Inc., trading as Flex; the first version of the product, in 2022, served construction contractors and their perennial cash-gap problem.
Flex came out of stealth in September 2023, raising $120 million — $20 million in equity plus $100 million in debt — and declaring itself a "finance super app". In March 2025 TechCrunch reported a $25 million round at a ≈$250 million valuation; the average client at the time did ≈$25 million in annual revenue, and payment volume had passed $1 billion.
The pace then accelerated. In December 2025 Portage led a $60 million Series B, taking equity to $105 million; in July 2026 Halo Fund brought in a $70 million Series B1 at a $1.2 billion valuation. That is ≈$180 million of equity and ≈$300 million of debt in total; the pool includes Wellington, Crosslink Capital, Titanium Ventures, MS&AD Ventures and Florida Funders.
Metrics as of July 2026, per the company: over $10 billion in annualised payment volume (4x growth year on year), annualised revenue "in nine figures", and 110 employees with a plan to double by year end. The average client uses four or more products — which is the entire business model expressed as a single number.
Products and pricing
The base plan costs $0 per month (here and below — as of August 2026). It includes an interest-bearing operating account, unlimited physical and virtual cards, expense management, accounting integrations, same-day ACH and domestic wires. A separate Flex Elite plan for "high-spending clients" is marked coming soon.
Interest on balances is tiered: up to 2.47% APY on an average daily balance above $1 million, and up to 1.37% above $100 thousand. Funds are placed through the Thread Bank sweep programme with FDIC coverage up to $3 million ($250 thousand per participating bank).
The card line splits into three products. The Business Reward Card pays 2% cashback or points and works as a charge card with daily settlement. The Net-60 Card gives a full 60 days interest-free or up to 1.75% cashback for early repayment. Separately, in July 2025 Flex became the first US fintech to launch a Visa Infinite Business card — unlimited Priority Pass, concierge, insurance, no annual fee.
The personal side is Flex Elite: up to 5% cashback with no categories and no cap, $0 annual fee, no foreign transaction fee. The rate is tied to your Flex Volume tier, meaning the volume the owner's business pushes through the platform; the tier recalculates automatically each month. The product is handed out by invitation to CEOs whose companies already bank with Flex.
The international block: payments to over 180 countries, 32 currencies, multi-currency accounts, virtual account details in USD, GBP and EUR, and local rails including SEPA, Pix, ACH and FedNow. The FX fee is stated as 1% per transaction, USD wires carry no fee, and transfers take 2–9 business days. Flex Global adds non-custodial USDC and USDT wallets, 1:1 on/off-ramp and a card accepted in over 170 countries; at the time of writing some stablecoin functions are still marked coming soon.
Competitive landscape
The immediate neighbours are obvious. Ramp won the market on expense management and aggressive procurement automation; Brex moved into enterprise and the startup segment; Mercury took the niche of convenient banking for digital-first companies; Slash and Meow work narrower verticals — arbitrage, e-commerce, treasury. A full view of the category sits in our piece on neobanks.
What sets Flex apart comes down to one idea: everyone else serves the company, Flex serves the person who owns it. Hence the Elite card priced off business volume, Beacon as a personal AI agent, and roadmap items in mortgage and travel. Forbes frames this as an attempt to take from Amex Centurion and the classic private banks the client who earns through a business and spends as a private individual.
The open question is how durable that difference is. The same piece asks directly what makes an "AI-native private bank" different from a neatly packaged product bundle, and there is no convincing answer yet.
What it means for the client
The main limitation is worth stating up front. Under the application rules, the banking product is open to all US-based businesses including sole proprietorships, while credit is open to US-based businesses excluding sole proprietorships and excluding the states of California, Vermont, South Dakota, North Dakota and Nevada. A company EIN and the applicant's SSN are required; every owner of 25% or more goes on the application.
For a non-resident owner this means the following. A US structure (LLC or Corp) with an EIN is mandatory. The SSN is the practical obstacle: ITIN is not mentioned as an alternative in the public rules, so the realistic scenario assumes a US resident or citizen among the beneficial owners, or an officer of the company holding an SSN. Check this before you start rebuilding the structure.
Protection of funds follows the standard BaaS model: Flex is a technology company, the money sits with partner banks, and FDIC coverage is achieved by sweeping across a network of banks. A decision on the application arrives by email within 48 hours.
What to look at when choosing: the real FX spread on top of the stated 1% (the rate always matters more than the fee), the composition of the sweep network and the per-bank limit, availability of credit products in your state, and the conditions under which the Elite tier moves. That 5% cashback looks handsome right up until business volume dips.
Under the hood
Flex holds no deposit-taking licence of its own. Per the legal disclosures, card and deposit products are distributed across three partners: Thread Bank (Member FDIC) handles banking and the debit card, Column N.A. (Member FDIC) issues the Business Reward Card as a Visa charge card and maintains deposit accounts, and Lead Bank issues the credit line-up including Net-60 and Visa Infinite Business.
The international perimeter is assembled from other people's rails. Cross-border payments run through an Airwallex Connected Account, and the global payments disclosures name Visa Global Services Inc. as the licensed money transmitter (NMLS ID 181032), registered with FinCEN and FINTRAC. Stablecoin wallets are stated to be non-custodial and are provisioned under the client's verified business identity.
The economics come from four sources. Interchange is the main one: 2% cashback on the Reward Card and up to 5% on Elite are funded out of Visa's commercial-card rates plus volume incentives from the network. Spread on balances — the company pays up to 2.47% and earns the gap to the market rate. The 1% FX fee on cross-border payments. And credit — Net-60, working capital and bill pay later, funded from the ≈$300 million debt pool (Victory Park Capital was one of the providers).
The pitfalls are predictable. A 5% cashback on personal spend is economically possible only alongside high business volume from the same client — cross-subsidy in its purest form, and if unit economics deteriorate the tiers get revised first. The BaaS model adds partner dependency: changing the sponsor bank means new account details and re-papering. Finally, in a multi-bank construction, responsibility for operational failures is smeared between Flex and the issuing bank.
Regulation and status
Flexbase Technologies, Inc. describes itself as a financial technology company and states plainly that it is not an FDIC-insured bank. This is the standard US construction: the regulated entity is the partner bank, and the fintech acts as programme manager and agent.
No publicly disclosed information could be found on Flex holding its own MSB registration or state money transmitter licences; in the global payments disclosures the licensed transmitter role is performed by a partner. The stablecoin perimeter is described as non-custodial, which removes the custody burden from the company and simultaneously shifts loss-of-access risk onto the client.
Since 2024–2025 US regulators have visibly tightened supervision of BaaS partnerships, and sweep programmes have drawn separate attention. The practical takeaway for a client is simple: check the current list of banks in the sweep network, and understand that FDIC covers money in the partner bank's account; the fintech's own obligations fall outside that coverage.
FAQ
Can a non-US resident open a Flex account?
Only through a US entity with an EIN, and provided the applicant holds an SSN. Flex's public rules require an SSN for identity verification and do not mention ITIN as an alternative. In practice this means having a US resident or citizen among the company's beneficial owners or officers.
What does it actually cost?
The base plan is $0 per month as of August 2026, domestic ACH and wires are free, and cards carry no annual fee. The main charge arises on cross-border operations: a 1% FX fee per transaction. The Elite plan for larger clients is marked coming soon at the time of publication.
How does the 5% cashback on the personal card work?
The Flex Elite rate is tied to your Flex Volume tier — the aggregate volume the owner's business pushes through the platform across all products. The tier recalculates automatically each month, with no categories and no caps. The card is issued by invitation to clients whose companies already bank with Flex.
Who holds the money and is it insured?
Deposits are placed with partner banks: Thread Bank and Column N.A., both Member FDIC. Coverage up to $3 million is achieved through a sweep programme distributing $250 thousand per participating bank. Flex itself is a technology company without a banking licence.
How is Flex different from Ramp and Mercury?
Ramp and Mercury serve the company as such — expenses, accounts, automation. Flex builds the owner's personal layer on top: the Elite card, a personal AI agent, and roadmap items in mortgage and travel. For an owner with several entities that means one interface instead of two separate provider relationships.