Castle

Castle is a U. S. -based company that provides an automated Bitcoin treasury solution tailored for small and medium-sized businesses, facilitating streamlined Bitcoin investment management and financial operations. Castle, founded in 2024 in Miami, US, specializes in automating Bitcoin treasury solutions for small and medium-sized businesses (SMBs).

The company has not undergone significant strategy shifts or pivots. It is not noted to have any parent or subsidiary relationships. The founder's specific history or previous ventures are not available. Castle raised a total of USD 1.

000 mn in its most recent funding round on June 26, 2025, led by Boost VC with participation from notable investors including Winklevoss Capital, Park Rangers Management, and Epoch, marking it as the only investment target so far. Castle offers an automated Bitcoin treasury solution designed specifically for small and medium-sized businesses (SMBs). The platform integrates with various payment and bookkeeping systems, such as QuickBooks, Stripe, and Shopify, enabling businesses to implement dynamic Bitcoin accumulation strategies. Castle's services allow clients to automate Bitcoin purchases as a percentage of their revenue, establish fixed-cost recurring buys, and maintain optimal cash allocations by regularly converting excess funds into Bitcoin.

This streamlined approach alleviates the burden of managing Bitcoin investments, ensuring that clients can focus on their core business operations while benefiting from Bitcoin's long-term growth potential. Currently, Castle serves clients primarily in the United States, enhancing their financial operations with innovative cryptocurrency solutions. Castle generates revenue through transaction fees charged at approximately 1% on Bitcoin purchases and sales. This fee structure applies to all transactions facilitated through the platform, including automated conversions from clients’ payment systems.

Clients, which include restaurant owners and other SMBs, engage with the platform by linking their payment processors to seamlessly convert sales revenue into Bitcoin. The company does not offer subscription plans; instead, revenue is directly tied to the volume of transactions processed. Through these mechanisms, Castle provides a low-cost entry into Bitcoin investment for businesses, reinforcing its value proposition in the cryptocurrency market. In June 2025, Castle raised USD 1 million in pre-seed funding led by Boost VC, aimed at accelerating its business development and onboarding initiatives.

The company plans to expand its solutions and reach new SMB markets within the United States, leveraging its recent funding to enhance product offerings and improve customer acquisition strategies.