Castle Raises $1M to Bring Automated Bitcoin Treasuries to America’s Main Street Businesses
A Bitcoin Treasury for the Rest of Us
In a bold step to bring bitcoin into the everyday toolkit of small business owners, Castle has raised a $1 million pre-seed round to fuel its mission: helping SMBs defend their balance sheets with automated bitcoin treasury management.
The oversubscribed round—led by Boost VC with participation from Winklevoss Capital, Park Rangers Capital, Epoch VC, and other angels—will accelerate Castle’s product development and expand access to SMBs seeking more than “high-yield” accounts that lose to inflation.
“Most business savings products are quietly eroded by inflation,” said Castle CEO Stephen Cole. “Bitcoin changes that. Our platform makes it effortless for SMBs to allocate to the best-performing asset of the past decade.”
Beyond Wall Street: Bitcoin for Main Street
Castle’s pitch is straightforward: give SMBs the kind of bitcoin exposure that big institutions have been hoarding, without the complexity or overhead. Think QuickBooks meets automated crypto treasury, minus the jargon.
Its platform connects with the tools businesses already use—Stripe, Square, PayPal, QuickBooks—and offers customizable strategies, allowing users to convert a portion of revenue into bitcoin in real time. That could be a fixed amount, a percentage of sales, or triggered by thresholds in the company’s fiat reserves.
Dynamic Allocation, Low Friction
This isn’t just another crypto wallet. Castle acts more like a set-it-and-forget-it treasury optimizer, dynamically maintaining a target allocation while ensuring liquidity for expenses. Whether a business wants 5% of its holdings in bitcoin or 25%, Castle keeps it there—even as cash flow ebbs and market conditions shift.
“Castle is built to be invisible,” said co-founder and CTO João Almeida. “Business owners don’t want to manage crypto. They want intelligent exposure aligned with their goals.”
This approach puts Castle in a unique position compared to other crypto fintechs chasing consumer day-traders or institutional whales. It’s targeting the 20 million+ American SMBs that keep the economy running but are often overlooked in the bitcoin conversation.
A Mission-Driven Team with Bitcoin DNA
Castle’s founding team are veteran bitcoiners—not just fintech entrepreneurs jumping on the latest cycle. Backers like Boost VC and the Winklevoss twins are betting on that experience and vision.
“Castle lives up to its name,” said Cameron and Tyler Winklevoss in a joint statement. “It helps businesses safeguard the value of their work—automatically and intelligently.”
Boost VC’s Brayton Williams echoed the sentiment: “Castle combines mission and execution in a way we rarely see. They’re turning bitcoin from a concept into a tool for real businesses.”
The Bigger Picture: Bitcoin as Infrastructure
The timing may be ideal. As inflation concerns persist and treasury yields wobble, more companies are reconsidering how they store value—especially cash-heavy businesses.
While giants like Tesla and MicroStrategy have made headlines for buying bitcoin, Castle is offering a path to participation for businesses without a CFO desk or corporate treasury department. Its early adopters include restaurants, SaaS startups, fitness chains, art dealers, and even accountants.
“Bitcoin isn’t just for hedge funds,” Cole said. “In ten years, we believe all businesses will adopt some form of bitcoin treasury strategy. Castle is how they’ll start.”
With this fresh capital, Castle is doubling down on onboarding more Main Street businesses—those who want bitcoin exposure without the volatility of manual trading or the operational drag of custom solutions.
If Castle succeeds, it won’t be because bitcoin got easier. It’ll be because Castle made not using it the bigger risk.
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