How to Automate Bitcoin DCA with Castle Revenue Integration

Most dollar-cost averaging into Bitcoin requires remembering to make purchases, whether daily, weekly, or monthly. For business owners juggling operations, payroll, and growth, that manual step often falls through the cracks. Castle takes a different approach: it connects directly to your revenue streams and converts a portion automatically, turning Bitcoin accumulation into something that happens in the background rather than on your to-do list.

The platform, which raised $1 million in pre-seed funding in June 2025 from investors including Boost VC and Winklevoss Capital, is built specifically for small and medium businesses that want Bitcoin exposure without the complexity of active treasury management.

How Revenue-Based DCA Differs from Traditional Scheduling

Traditional DCA means buying a fixed dollar amount on a set schedule. You might purchase $500 in Bitcoin every Monday regardless of what's happening in your business. This works, but it doesn't adapt to your actual cash flow.

Castle supports both approaches, but its distinctive feature is dynamic revenue-based allocation. Instead of a fixed amount, you set a percentage of incoming revenue to convert to Bitcoin. If your e-commerce store has a strong month, your Bitcoin purchases scale up. During slower periods, they scale down automatically.

This creates a form of DCA that's tied to business performance rather than arbitrary timing. Some users find this reduces the psychological friction of buying during business downturns, since the allocation adjusts naturally.

Connecting Your Revenue Sources

Castle integrates with the payment processors and bookkeeping tools most small businesses already use. The current integration list includes:

• Payment processors: Stripe, Square, Shopify, PayPal
• Bookkeeping platforms: QuickBooks, Xero

Setup begins at savewithcastle.com, where sign-up is free with no monthly fees. After creating an account, you'll connect your existing business tools through OAuth authentication, the same secure process you'd use to connect any two software platforms.

For a Stripe integration, this means authorizing Castle to read your incoming payment data. The platform doesn't need write access to your payment processor; it only needs to see when revenue arrives to trigger its allocation rules.

Setting Your Allocation Rules

Once your revenue sources are linked, you'll configure how much to convert. Castle offers three primary approaches:

1. Fixed recurring amount: The traditional DCA model. Set $200 per week or whatever fits your budget.

1. Revenue percentage: Allocate 5-10% of incoming revenue (or whatever percentage you choose) to Bitcoin purchases. This is what Castle calls a "revenue split."

1. Cash threshold triggers: Set rules like "when cash balance exceeds $50,000, purchase $5,000 in Bitcoin." This approach maintains liquidity while putting excess cash to work.

You can combine these strategies or adjust them as your business evolves. The platform handles execution without requiring you to log in and confirm each purchase.

Who This Works Best For

The businesses getting the most from Castle's revenue integration tend to share a few characteristics. They're already using supported payment processors and don't want to change their existing workflow. They have relatively predictable revenue that makes percentage-based allocation sensible. And they're thinking about Bitcoin as a long-term treasury position rather than a trading opportunity.

E-commerce stores, SaaS companies, restaurants, real estate businesses, and professional services firms all fit this profile. The common thread is regular incoming payments through digital channels that Castle can monitor.

Businesses with highly irregular revenue, heavy reliance on cash or checks, or very tight margins might find the automation less useful. If you're not sure whether you can afford to allocate any revenue to Bitcoin, the automation doesn't solve that underlying question.

What You Won't Find (Yet)

As of 2026, Castle doesn't offer public API documentation for custom scripting. If you want to build your own automated DCA logic or integrate Castle with internal tools, you're limited to the platform's native rules engine. For most small businesses, this isn't a constraint. For companies with technical teams wanting deeper customization, it's worth noting.

The platform also doesn't appear to support advanced trading strategies like timing purchases around price movements. This is probably intentional; the whole point is removing decision-making from the process. But if you want more sophisticated execution, you'll need additional tools.

The Broader Context

Castle emerged alongside growing corporate interest in Bitcoin treasuries following developments in 2024 and 2025. While large public companies have treasury teams to manage these decisions, small businesses typically don't. The platform is essentially productizing what a fractional CFO might otherwise handle manually.

The revenue-based approach addresses a real critique of traditional DCA: it ignores context entirely. Buying the same amount whether your business just closed a great quarter or is struggling to make payroll doesn't make intuitive sense. Tying purchases to actual revenue at least creates some relationship between your accumulation rate and your ability to afford it.

That said, Bitcoin remains volatile. Automating purchases doesn't change the asset's risk profile. The convenience of hands-off accumulation could become inconvenient if you need that liquidity during a business downturn while Bitcoin is simultaneously down. The allocation percentages you choose matter, and conservative starting points (many businesses use 5-10% of revenue) leave room to adjust.

Getting Started

The practical steps are straightforward: create an account, connect your payment processor or bookkeeping tool, set your allocation rules, and let the automation run. The platform handles the Bitcoin purchases and custody.

For business owners who've been thinking about adding Bitcoin to their treasury but haven't found the time to manage it actively, revenue integration removes the ongoing attention cost. The question isn't really about the setup process, which takes minutes. It's about whether allocating a portion of revenue to Bitcoin fits your business's risk tolerance and time horizon.

If you've already decided yes on that question, Castle's automation makes the execution nearly invisible.