Flex Secures $60M to Accelerate Its AI-Native Finance Operating System

Flex, the San Francisco–based AI finance startup, has secured $60 million in fresh funding, pushing its valuation to nearly $500 million and bringing its total equity raised to $105 million. For a company that only recently emerged into the broader fintech conversation, Flex is rapidly positioning itself as one of the most consequential players rearchitecting how businesses manage credit, payments, treasury, and operational finance.

The new funding round, led by Portage Ventures with participation from existing backers, accelerates Flex’s ambitious plan: to build the world’s first AI-native financial operating system, where credit, cash flow, accounts payable, accounts receivable, and expense management run autonomously through intelligent agent-based automation. While platforms like Ramp and Brex pioneered modern corporate finance software, Flex is attempting to take the category into its next evolutionary phase, replacing traditional workflows with agentic AI systems that act, decide, and optimize in real time.

A New Category in Fintech: AI-Driven Private Credit

One of Flex’s most innovative pillars is its Private Credit suite, which redefines how businesses access and manage capital. Traditional underwriting relies on static financial assessments; Flex’s underwriting is dynamic, continuous, and AI-driven.

Its flagship Net-60 Card offers 0% interest for more than 60 days on every purchase that gives businesses extended working capital without fees or interest. But the true differentiator is Flex’s adaptive capital engine. Instead of fixed credit lines, the platform offers dynamic capital that grows with a company’s revenue, expanding or contracting based on real-time business performance.

Another standout feature is Bill Pay Later, which gives companies 60 days of breathing room on every vendor payment. For fast-growing businesses managing tight cash cycles, this transforms how operational expenses can be smoothed and financed. Taken together, Flex’s credit stack resembles a hybrid between a corporate card, a revenue-based financing engine, and a cash-flow optimizer. But with an AI layer that continuously recalibrates limits, risk thresholds, and repayment timing.

Flex’s Payments Layer: AP, AR, Global Payments, and Card Rails in One Platform

Beyond credit, Flex’s payments infrastructure is engineered to automate the entire payable and receivable cycle. With AI-managed Accounts Payable, approvals move automatically, invoices are read and categorized with accuracy, and recurring processes run on “cruise control.”

On the receivables side, AI ensures invoices are followed up on, predicted, and collected on schedule, reducing the administrative load that typically falls on finance teams.

Flex also offers global payment capabilities across more than 180 countries, a feature particularly relevant for distributed teams and cross-border vendors. And with Pay by Card, companies can pay any vendor (even those who don’t accept credit cards) using Flex’s card rails, unlocking additional cash flow flexibility. This creates a unified payment layer that blends automation, working capital optimization, and international money movement.

A Complete Business Financial Stack Built for 2025

Flex has also introduced a 3-in-1 business credit card that combines Net-60 terms, cashback, and rewards in a single product. Complementing this is a full Banking & Treasury suite, offering institutional-grade accounts designed for large balances, automated treasury actions, and integrated cash visibility.

Expense management is built natively into the platform, enabling companies to issue cards, track spend, and enforce policies automatically through AI monitoring. Meanwhile, Flex’s AI-powered Bill Pay engine removes the manual effort of categorizing, scheduling, and reconciling vendor payments, a traditionally burdensome process for finance teams.

With these components combined, Flex no longer resembles a credit card startup but an integrated financial system designed to replace multiple legacy tools across banking, card issuance, treasury, AP/AR, and spend management.

Agentic ERP: The Most Advanced Layer in Flex’s Platform

Where Flex truly distinguishes itself is in its Agentic ERP, a new AI-first interpretation of enterprise resource planning. Instead of dashboards and workflows, Flex introduces a network of autonomous agents that operate continuously behind the scenes.

Owner Intelligence functions as an AI CFO, analyzing the business end-to-end, surfacing insights, predicting cash constraints, and recommending financial actions. These insights are not passive; they are actionable, synthesizing everything from upcoming AP loads to credit utilization and revenue projections.

AP Agents convert emails into payments automatically, interpreting invoice attachments, matching purchase orders, identifying vendors, and scheduling payments without human intervention. Expense Agents monitor employee spending 24/7, flagging unusual behavior, enforcing rules, and providing real-time context to finance teams.

This is the beginning of a new paradigm in business software where systems don’t just automate tasks, they actively run financial operations. Flex’s agent-based architecture positions it as one of the earliest examples of what the industry is calling “autonomous finance.”

Built for a New Era of Financial Management

In an environment where companies face tighter margins, complex multi-system workflows, and rising treasury complexity, Flex represents a timely evolution. Its platform acknowledges a fundamental truth: business is about continuous optimization, instant decision-making, and intelligent cash movement. Not back-office recordkeeping!

By unifying credit, payments, treasury, and an agentic AI layer, Flex offers an increasingly compelling alternative to fragmented point solutions. As capital becomes more expensive and the demands on finance teams continue to grow, the shift to AI-powered financial autonomy is not only logical, it feels inevitable.

Flex is constructing the blueprint for an AI-native financial operating system. The company’s use of agentic automation signals the next chapter in fintech, where software takes on operational responsibility rather than merely assisting it. If Flex executes its vision, it could become one of the defining financial platforms of this decade, reshaping how businesses control cash flow, manage risk, and scale responsibly.

Flex’s biggest advantage isn’t capital or features, it’s its architectural leap. By committing early to agentic finance, Flex may be years ahead of incumbents still adapting legacy systems to AI. This is a company worth watching closely.