Overview
Portfolio
More
Castle Island Ventures
Boston, United States
Castle Island Ventures invests exclusively in public blockchain infrastructure and application companies. The firm supports entrepreneurs building protocols and tools that enable transformative blockchain ecosystems to r...
Portfolio
23+
Employees
10+
Founded
2018
AUM
≈ $300.0M
Investment focus
Stages
No stages listed
Industries
Blockchain & Cryptocurrency
Geographic scope
Global
Fund details
Funds
Castle Island Ventures III
Vintage 2021 • $250.0M
Castle Island Ventures II
Vintage 2021 • $50.0M
Sources
Castle Island Ventures
Castle Island Ventures invests exclusively in public blockchain infrastructure and application companies. The firm supports entrepreneurs building protocols and tools that enable transformative blockchain ecosystems to reach their full potential, aiming to accelerate adoption and innovation in the space.
Portfolio
23+
Employees
10+
Founded
2018
AUM
≈ $300.0M
Funds
Castle Island Ventures III · Vintage 2021 • $250.0M
Castle Island Ventures II · Vintage 2021 • $50.0M
Stages
No stages listed
Industries
Blockchain & Cryptocurrency
Geographic scope
Global
Sources
Showing 23 of 23 matched portfolio companies
Alpen provides an EVM-compatible environment for building decentralized financial applications directly on Bitcoin. The platform enables users to leverage their BTC for borrowing, earning interest, and spending through a novel 1-of-N Bitcoin bridge. All financial transactions settle directly on Bitcoin, inheriting its double-spend security via a unique ZK rollup architecture.
Funding: $8.5M
Rough estimate of the amount of funding raised
Funding: $8.5M
Rough estimate of the amount of funding raised
Andrena offers residential high‑speed internet service with plans up to 1 Gbps, priced from $30 per month. Customers can activate service in under three minutes without a technician visit, and the company bills users on a monthly subscription basis. The model focuses on delivering affordable, secure broadband to multi‑device households and small businesses, emphasizing low cost, fast deployment, and reliable connectivity.
40+
3K+Approximate amount of employees
Funding: $44.3M
Rough estimate of the amount of funding raised
Funding: $44.3M
Rough estimate of the amount of funding raised
42 provides a platform for trading based on real-time market trends and significant moments. It enables users to execute strategies tied directly to unfolding events and data shifts. This service focuses on capturing short-term opportunities within dynamic financial environments.
5+
200+Approximate amount of employees
Funding: $7.7M
Rough estimate of the amount of funding raised
Funding: $7.7M
Rough estimate of the amount of funding raised
Arcade is a DeFi lending protocol that supports any token on Ethereum and Base, including memecoins, NFTs, and tokenized real‑world assets. Users can supply these assets to earn interest or use them as collateral to borrow other tokens, with automated risk assessment and gas‑optimized transactions on the Base L2.
Funding: $15.0M
Rough estimate of the amount of funding raised
Funding: $15.0M
Rough estimate of the amount of funding raised
Arch provides crypto-backed loans that allow asset holders to access cash without selling their digital assets, utilizing secure custody solutions to protect collateral. By eliminating credit checks and rehypothecation, Arch offers a straightforward financing option that preserves the value of cryptocurrencies while providing immediate liquidity.
Funding: $7.8M
Rough estimate of the amount of funding raised
Funding: $7.8M
Rough estimate of the amount of funding raised
Atrium is an AI-powered intelligence platform that unifies bank filings and real estate lending data to deliver real-time, loan-level insights for investors, analysts, and bankers. The platform enables users to quickly assess credit risk, trace commercial real estate exposure, and benchmark peers using enriched data feeds. This unified view allows finance professionals to act on market-moving developments and credit events faster than traditional methods.
Funding: $4.0M
Rough estimate of the amount of funding raised
Funding: $4.0M
Rough estimate of the amount of funding raised
This company provides an AI-powered platform for digital content validation, specializing in detecting fraud and synthetic media like deepfakes in photos, videos, and documents. It offers APIs and tools to authenticate digital assets, helping industries such as insurance and cybersecurity mitigate risks and losses. The service automates content inspection to enhance trust and operational efficiency across various business workflows.
Funding: $3.2M
Rough estimate of the amount of funding raised
Funding: $3.2M
Rough estimate of the amount of funding raised
Babylon Labs provides a self‑custodial Bitcoin staking protocol that lets BTC holders lock their coins directly from their own wallets to secure Bitcoin Supercharged Networks (BSNs) without wrapping, pegging, or bridging. Stakers retain full control of their private keys, can request unbonding at any time, and earn rewards for validating PoS chains, L2s, rollups, and other decentralized systems, while networks gain Bitcoin’s security and liquidity.
Beam provides a unified payments infrastructure that routes transactions across multiple fiat rails and stablecoin networks via a single RESTful API and a no‑code dashboard. The platform offers real‑time routing, built‑in KYC/KYB and AML compliance, and dynamic fee optimization, enabling fintechs, payment service providers, banks, and corporate treasury teams to move money faster, cheaper, and with bank‑grade security.
5+
7K+Approximate amount of employees
Funding: $7.0M
Rough estimate of the amount of funding raised
Funding: $7.0M
Rough estimate of the amount of funding raised
Utilizes engineered diamond-dust to create unclonable, covert identity markers that can be embedded in any physical object, linking them to a secure digital record. This technology prevents counterfeiting, enables precise provenance tracking, and provides real-time data access across industries such as supply chain, aerospace, and premium retail.
Funding: $40.0M
Rough estimate of the amount of funding raised
Funding: $40.0M
Rough estimate of the amount of funding raised
Hata is a dual-licensed cryptocurrency exchange in Malaysia that facilitates the buying, selling, and management of digital assets using fiat currencies like the US Dollar and Malaysian Ringgit. By providing a regulated and user-friendly platform, Hata enables users to access cryptocurrencies securely while ensuring compliance with local financial regulations.
Funding: $4.8M
Rough estimate of the amount of funding raised
Funding: $4.8M
Rough estimate of the amount of funding raised
Hidden Road operates a technology-driven prime brokerage platform that facilitates real-time risk management and financing across traditional and digital asset classes. By minimizing counterparty and credit risk through a robust capital base and proprietary infrastructure, the company enhances scalability for institutional investors navigating complex market environments.
Funding: $175.0M
Rough estimate of the amount of funding raised
Funding: $175.0M
Rough estimate of the amount of funding raised
The startup develops a zero-knowledge blockchain platform for liquid staking, enabling users to stake, lend, borrow, and trade their assets while maintaining their liquidity. This infrastructure allows users to earn rewards on their staked assets without sacrificing their ability to utilize those assets for other financial activities.
10+
300+Approximate amount of employees
Funding: $4.0M
Rough estimate of the amount of funding raised
Funding: $4.0M
Rough estimate of the amount of funding raised
Manetu offers a zero-knowledge data security platform that enables organizations to manage sensitive information while ensuring compliance with international data localization and privacy regulations. By employing attribute-based access control and encryption, the platform allows authorized users to securely access and share data without exposing it to cloud providers or unauthorized parties.
Funding: $6.7M
Rough estimate of the amount of funding raised
Funding: $6.7M
Rough estimate of the amount of funding raised
This startup provides Knowledge Agents for technical B2B revenue teams, automating workflows such as answering inquiries, gathering relevant information, and preparing for meetings using product and client-specific knowledge. By implementing data segregation, the solution enhances team efficiency and improves revenue generation through streamlined operations.
Funding: $6.0M
Rough estimate of the amount of funding raised
Funding: $6.0M
Rough estimate of the amount of funding raised
Modern Treasury provides a payment operations platform that automates the initiation, tracking, and reconciliation of payments across traditional and instant payment rails, enhancing real-time visibility and operational efficiency. This solution addresses the need for businesses to adapt to the Instant Economy by streamlining payment processes and improving customer experiences.
Funding: $183.0M
Rough estimate of the amount of funding raised
Funding: $183.0M
Rough estimate of the amount of funding raised
Notabene provides an open, modular trust layer that coordinates pre‑transaction verification and authorization for stablecoin and crypto payments, enabling instant, compliant transfers between verified financial institutions worldwide. Its three‑tier architecture—protocol, network, and interface—offers programmable, auditable trust at scale through a standardized API and ready‑to‑use interface, supporting pull‑payment invoicing, recurring subscriptions, and automated travel‑rule compliance.
Funding: $24.7M
Rough estimate of the amount of funding raised
Funding: $24.7M
Rough estimate of the amount of funding raised
The startup develops a Web3 research application that provides high-fidelity insights and data through a desktop analytics tool, enabling institutions to access reliable information on market sizing and growth estimations. This application addresses the lack of trustworthy data in the rapidly evolving Web3 landscape, facilitating informed decision-making for institutional investors.
Funding: $4.0M
Rough estimate of the amount of funding raised
Funding: $4.0M
Rough estimate of the amount of funding raised
RockSolid provides institutional-grade liquid vaults that offer streamlined access to optimized DeFi returns. The platform enables projects and institutions to launch white-label vaults with single-click deposits for their communities. These vaults generate rewards through actively managed strategies across lending, liquid staking, and incentivization campaigns on various protocols.
<3
10+Approximate amount of employees
Funding: $2.8M
Rough estimate of the amount of funding raised
Funding: $2.8M
Rough estimate of the amount of funding raised
Station70 offers a secure platform for scalable digital asset key backup and recovery, utilizing zero-knowledge architecture and advanced cryptography to eliminate counterparty risk. The solution ensures compliance with global digital asset regulations while providing institutions with resilient infrastructure that supports their growth without compromising security.
Funding: $11.0M
Rough estimate of the amount of funding raised
Funding: $11.0M
Rough estimate of the amount of funding raised
Tesser provides a full‑stack stablecoin platform that enables banks, payment service providers, and remittance firms to settle cross‑border payments directly in stablecoins. The solution includes multi‑chain wallets, configurable custody, on‑/off‑ramps and rule‑based treasury tools to reduce prefunding, retain FX revenue, and meet compliance requirements.
Funding: $4.5M
Rough estimate of the amount of funding raised
Funding: $4.5M
Rough estimate of the amount of funding raised
Valiu is a fintech platform that lets businesses open bank‑grade, multi‑currency accounts in seven major currencies with no minimum balances or maintenance fees. It provides real‑time FX trading across up to 13 currency pairs at competitive rates and enables free inbound and outbound international transfers via SWIFT, IBAN, SPID and SPEI, all backed by IPAB‑guaranteed, regulated banking infrastructure.
Funding: $6.5M
Rough estimate of the amount of funding raised
Funding: $6.5M
Rough estimate of the amount of funding raised
The startup offers a decentralized finance protocol that enables users to stake ETH and receive a fee-free asset basket, mitigating risks associated with centralization and regulatory pressures. By utilizing DeFi-native staked Ethereum indices, the platform allows users to diversify their investments while earning competitive yields.
Funding: $3.0M
Rough estimate of the amount of funding raised
Funding: $3.0M
Rough estimate of the amount of funding raised