Castle Island Ventures

Castle Island Ventures is a Boston-based venture capital firm founded in 2018, specializing in investments exclusively within the public blockchain sector. The firm focuses on supporting infrastructure and application companies that are poised to facilitate the adoption of blockchain technology for a broader user base. Through its early-stage venture capital fund, Castle Island Ventures II, the firm targets investments in the financial services, information technology, and cryptocurrency sectors, aiming to support around 20 startups. By concentrating on transformative protocols, Castle Island Ventures seeks to empower innovative services that could reach the next billion users.

Ria Bhutoria

General Partner

Nic Carter

Co-Founder & Partner

Sean Judge

General Partner

Matthew Walsh

Co-Founder & Partner

48 past transactions

PYOR

Seed Round in 2023
PYOR has extensive expertise building in crypto and has played major roles in the creation of several large Indian unicorns, as well as extensive experience in global blue chip organisations.

Arch

Seed Round in 2023
Arch is a financial technology company that offers loans to alternative asset owners.

Yellow Card

Series B in 2022
Yellow Card Financial, LLC operates an online cryptocurrency trading platform that facilitates the buying and selling of Bitcoin and other cryptocurrencies without the need for a bank account. Founded in 2016 and headquartered in Chamblee, Georgia, the company offers a range of services including over-the-counter cryptocurrency trading, payment solutions, and currency exchange. Additionally, Yellow Card provides gift cards for cryptocurrency, aiming to transform the traditional remittance market in Nigeria and other countries. The company also has physical locations in Nigeria, Tanzania, Cameroon, Kenya, and South Africa, enhancing its accessibility for customers seeking to engage in cryptocurrency transactions.

Kinetic

Seed Round in 2022
Kinetic is a company operating in stealth mode.

Halborn

Series A in 2022
Halborn is an award-winning, elite cybersecurity company for blockchain organizations. Security work never ends. Halborn serves as a third-party partner to continuously assess an organization's most vital assets, drive maximum automation and provide world-class cybersecurity consulting and execution every step of the way - far beyond smart contracts.

Dynamic Labs

Seed Round in 2022
Dynamic is multi-chain wallet-based authentication and authorization platform.

Mash

Seed Round in 2022
The internet is fundamentally broken. It's because of monetization. “Show me the incentives and I'll show you the outcome.” Our mission is to remonetize the web by enabling value for value monetary exchanges between pubs/creators/orgs and their users. A new business model for the open internet. We are unlocking this with friction-minimized streaming payments that are no/low cost, instantly settled, trust-minimized. It is built on the best global digital monetary network ever conceived, Bitcoin. Enabled by Lightning Network. Most users don't need to know this or be a Bitcoiner. Over time we suspect many will.

Try Your Best

Seed Round in 2022
Try Your Best is a blockchain technology company.

Soundmint

Seed Round in 2022
SoundMint Music NFTs are the generative combination of visual layers with musical stems, combined by the SoundMint algorithm.

Socket Supply

Seed Round in 2022
Socket Supply creates tools that help developers deploy to the cloud and beyond.

Try Your Best

Pre Seed Round in 2022
Try Your Best is a blockchain technology company.

Eaglebrook Advisors

Series A in 2022
Eaglebrook Advisors is a crypto-focused investment firm that provides financial advisors with simple, secure and compliant access to bitcoin through the Eaglebrook Bitcoin SMA

Casa

Series A in 2021
Casa offers a secure storage solution for consumers and companies to safely store their digital wealth. Casa helps users manage their private keys, through the multi-location security model that removes single points of failure and protects users from theft, accidents, and disasters, providing them with the tools for securing their digital lives.

Yellow Card

Series A in 2021
Yellow Card Financial, LLC operates an online cryptocurrency trading platform that facilitates the buying and selling of Bitcoin and other cryptocurrencies without the need for a bank account. Founded in 2016 and headquartered in Chamblee, Georgia, the company offers a range of services including over-the-counter cryptocurrency trading, payment solutions, and currency exchange. Additionally, Yellow Card provides gift cards for cryptocurrency, aiming to transform the traditional remittance market in Nigeria and other countries. The company also has physical locations in Nigeria, Tanzania, Cameroon, Kenya, and South Africa, enhancing its accessibility for customers seeking to engage in cryptocurrency transactions.

Alkimiya Protocol

Venture Round in 2021
We build applications that generate revenue using the latest in web and mobile technologies.

Talos

Series A in 2021
Talos Trading, Inc. is a technology provider focused on the institutional trading of digital assets, facilitating a comprehensive trading lifecycle that includes pre-trade price discovery, order routing, execution, and settlement. Founded in 2018 and based in New York, the company offers a platform that connects various participants in the crypto ecosystem, including institutional investors, prime brokers, exchanges, OTC desks, lenders, and custodians. This infrastructure enables clients to efficiently execute, analyze, and settle trades across spot, futures, and foreign exchange markets. Talos Trading's solutions support real-time price streaming, portfolio accounting, and liquidity access, catering to the needs of its diverse clientele in the rapidly evolving digital asset market.

Coin Metrics

Series B in 2021
Coin Metrics Inc. is an online publisher specializing in blockchain and cryptocurrency data, offering a range of market and network analytics to various industries. Founded in 2017 and based in Cambridge, Massachusetts, the company provides several key products, including the CM Network Data Pro, which delivers historical crypto network data in a detailed format for institutional clients. Additionally, Coin Metrics offers the CM Market Data Feed, a standardized solution for trade, candle, and order book data from multiple exchanges, and CM Reference Rates, which provides fixed pricing for various assets quoted in U.S. dollars. By focusing on transparent and actionable data, Coin Metrics enables stakeholders to better understand and utilize public crypto networks.

Mash

Pre Seed Round in 2021
The internet is fundamentally broken. It's because of monetization. “Show me the incentives and I'll show you the outcome.” Our mission is to remonetize the web by enabling value for value monetary exchanges between pubs/creators/orgs and their users. A new business model for the open internet. We are unlocking this with friction-minimized streaming payments that are no/low cost, instantly settled, trust-minimized. It is built on the best global digital monetary network ever conceived, Bitcoin. Enabled by Lightning Network. Most users don't need to know this or be a Bitcoiner. Over time we suspect many will.

EasyBins

Seed Round in 2021
EasyBins simplifies your grocery routine once and for all, so you can focus on the things that matter. We provide a one-stop, single-checkout marketplace of your favorite national and local brands, products, and retailers, delivered twice-daily to your doorstep. Click The Box, Get A Bin.

evaluate.xyz

Pre Seed Round in 2021
NFT Valuation Platform and Community

River

Series A in 2021
River Financial Inc. is a financial technology company based in San Francisco, California, founded in 2019 by Alexander Leishman and Andrew Benson. The company specializes in providing a platform for individuals and institutions to buy, manage, and sell bitcoin. Its flagship product is a Bitcoin brokerage designed for sophisticated retail investors, offering a high-touch service that prioritizes security and client experience. River Financial's platform includes tools for investment performance, such as cost basis tracking, catering to the needs of its clients in the evolving cryptocurrency market.

DFX Finance

Seed Round in 2021
DFX Finance is a new decentralized finance exchange protocol optimized for non-U.S. dollar stable coins.

Casa

Seed Round in 2021
Casa offers a secure storage solution for consumers and companies to safely store their digital wealth. Casa helps users manage their private keys, through the multi-location security model that removes single points of failure and protects users from theft, accidents, and disasters, providing them with the tools for securing their digital lives.

Capsule Social

Pre Seed Round in 2021
Capsule Social operates as a decentralized social media platform.

Valiu

Seed Round in 2020
Valiu Inc. is a fintech company founded in 2018 and headquartered in Bogota, Colombia, that specializes in electronic fund transfer services from Colombia to Venezuela. The company has developed a mobile application designed to facilitate a dollar savings and transfer system, making financial services accessible to all Venezuelans, including migrants and their families. This service is tailored to accommodate users of varying socioeconomic backgrounds and different mobile device capabilities, ensuring that a broad audience can utilize its offerings.

Valiu

Seed Round in 2020
Valiu Inc. is a fintech company founded in 2018 and headquartered in Bogota, Colombia, that specializes in electronic fund transfer services from Colombia to Venezuela. The company has developed a mobile application designed to facilitate a dollar savings and transfer system, making financial services accessible to all Venezuelans, including migrants and their families. This service is tailored to accommodate users of varying socioeconomic backgrounds and different mobile device capabilities, ensuring that a broad audience can utilize its offerings.

Notabene

Seed Round in 2020
Notabene, Inc. is a New York-based company that specializes in developing a software as a service (SaaS) platform designed for crypto compliance in the financial industry. Founded in 2020, Notabene enables businesses to adhere to evolving global regulations for cryptocurrency transactions, particularly focusing on the Travel Rule. The company offers a unified API and dashboard that assists compliance officers in managing risks associated with both Travel Rule and non-custodial transactions. By simplifying compliance processes, Notabene enhances transaction confidence for its clients, facilitating increased interaction with a broad network of crypto businesses. This ultimately supports the growth of transaction volumes and fosters business expansion for its customers.

Talos

Venture Round in 2020
Talos Trading, Inc. is a technology provider focused on the institutional trading of digital assets, facilitating a comprehensive trading lifecycle that includes pre-trade price discovery, order routing, execution, and settlement. Founded in 2018 and based in New York, the company offers a platform that connects various participants in the crypto ecosystem, including institutional investors, prime brokers, exchanges, OTC desks, lenders, and custodians. This infrastructure enables clients to efficiently execute, analyze, and settle trades across spot, futures, and foreign exchange markets. Talos Trading's solutions support real-time price streaming, portfolio accounting, and liquidity access, catering to the needs of its diverse clientele in the rapidly evolving digital asset market.

blockfi

Series C in 2020
BlockFi, Inc. is a financial services company that specializes in cryptocurrency wealth management. Founded in 2017 and based in Jersey City, New Jersey, BlockFi offers a range of products designed for crypto investors. Its flagship offering is the BlockFi Interest Account, which allows users to earn interest on their Bitcoin, Ether, and Gemini Dollar holdings. The company also provides secured loans to clients who collateralize their loans with cryptocurrency, facilitating liquidity for both individuals and institutions. Additionally, BlockFi operates a trading platform that enables the exchange of various cryptocurrency pairs and offers customizable lending solutions. With a focus on enhancing financial accessibility and transparency in the digital asset space, BlockFi aims to meet the evolving needs of its clients while ensuring secure management of their crypto assets through a registered custodian.

River

Seed Round in 2020
River Financial Inc. is a financial technology company based in San Francisco, California, founded in 2019 by Alexander Leishman and Andrew Benson. The company specializes in providing a platform for individuals and institutions to buy, manage, and sell bitcoin. Its flagship product is a Bitcoin brokerage designed for sophisticated retail investors, offering a high-touch service that prioritizes security and client experience. River Financial's platform includes tools for investment performance, such as cost basis tracking, catering to the needs of its clients in the evolving cryptocurrency market.

Manetu

Seed Round in 2020
Manetu, Inc. develops a consumer privacy management (CPMSM) platform. It offers The Manetu CPMSM, a platform that acts as an infrastructure for the end-to-end management of the private information to provide the service to the users’ customers. The company’s platform is also used for collaborating with the customers to manage all their sensitive data; enables users’ customers to determine what data they will share and for how long. Manetu, Inc. was incorporated in 2019 and is based in Ridgewood, New Jersey.

Coin Metrics

Series A in 2020
Coin Metrics Inc. is an online publisher specializing in blockchain and cryptocurrency data, offering a range of market and network analytics to various industries. Founded in 2017 and based in Cambridge, Massachusetts, the company provides several key products, including the CM Network Data Pro, which delivers historical crypto network data in a detailed format for institutional clients. Additionally, Coin Metrics offers the CM Market Data Feed, a standardized solution for trade, candle, and order book data from multiple exchanges, and CM Reference Rates, which provides fixed pricing for various assets quoted in U.S. dollars. By focusing on transparent and actionable data, Coin Metrics enables stakeholders to better understand and utilize public crypto networks.

Attestiv

Seed Round in 2020
Attestiv Inc. provides a software solution that verifies the authenticity of digital photos and videos for businesses. Its products serves organizations in insurance, public safety, real estate, automotive, news and media, and banking sectors. The company was incorporated in 2018 and is based in Natick, Massachusetts.

Zabo

Seed Round in 2020
Zabo is a financial technology company that integrates traditional banking with cryptocurrency services. It offers a comprehensive banking solution that includes checking and savings accounts, a debit card, and direct deposit capabilities. The platform allows users to easily exchange cryptocurrencies, such as Bitcoin and Ether, directly from their bank accounts. Zabo's application is built on an API framework, enabling seamless connection of cryptocurrency accounts with minimal coding required. Additionally, it supports hardware wallet integration, facilitating the buying, selling, and transferring of cryptocurrencies for its clients.

blockfi

Series B in 2020
BlockFi, Inc. is a financial services company that specializes in cryptocurrency wealth management. Founded in 2017 and based in Jersey City, New Jersey, BlockFi offers a range of products designed for crypto investors. Its flagship offering is the BlockFi Interest Account, which allows users to earn interest on their Bitcoin, Ether, and Gemini Dollar holdings. The company also provides secured loans to clients who collateralize their loans with cryptocurrency, facilitating liquidity for both individuals and institutions. Additionally, BlockFi operates a trading platform that enables the exchange of various cryptocurrency pairs and offers customizable lending solutions. With a focus on enhancing financial accessibility and transparency in the digital asset space, BlockFi aims to meet the evolving needs of its clients while ensuring secure management of their crypto assets through a registered custodian.

ZenLedger

Seed Round in 2019
ZenLedger, Inc. is a software company that specializes in cryptocurrency tax management, founded in 2017 and headquartered in Bellevue, Washington. The company provides a comprehensive tax tool designed for cryptocurrency investors and accountants, allowing users to easily import their cryptocurrency transactions, calculate gains and income, and prepare tax returns. ZenLedger's platform generates various essential documents, including profit/loss statements, capital gains reports, and income reports, thereby simplifying the tax reporting process for miners, day traders, and long-term holders. It is compatible with a wide range of exchanges, currencies, and wallets, making it a versatile solution for both individual investors and tax professionals. By automating the tax preparation process, ZenLedger aims to alleviate the complexities and challenges associated with cryptocurrency taxation.

Flipside Crypto

Seed Round in 2019
Flipside Crypto, Inc. is a Boston-based company that operates a cryptocurrency information platform designed to provide business intelligence for blockchain organizations. Founded in 2017, the company offers a range of services, including cryptocurrency management, acquisition, digital walleting, custody services, and portfolio dashboards for investors. Flipside Crypto specializes in analytics, delivering insights into user behaviors, developer activities, and financial metrics. It also offers the Fundamental Crypto Asset Score (FCAS), which measures the fundamental health of cryptocurrency projects. Additionally, Flipside Crypto collaborates with partners like CoinMarketCap and Messari to distribute its analytics. The company is backed by notable investors, including Coinbase Ventures and True Ventures.

DUST Identity

Series A in 2019
DUST Identity, Inc. develops an authentication system technology that utilizes nano-diamonds to create an unclonable identity layer on any object for any supply chain. It also provides an optical scanner and cloud-based infrastructure that provides an interface to the object identity. DUST Identity, Inc. was formerly known as Diamond Nanotechnalogies, Inc. The company was founded in 2011 and is based in Framingham, Massachusetts with an additional office in Princeton, New Jersey.

Flipside Crypto

Seed Round in 2018
Flipside Crypto, Inc. is a Boston-based company that operates a cryptocurrency information platform designed to provide business intelligence for blockchain organizations. Founded in 2017, the company offers a range of services, including cryptocurrency management, acquisition, digital walleting, custody services, and portfolio dashboards for investors. Flipside Crypto specializes in analytics, delivering insights into user behaviors, developer activities, and financial metrics. It also offers the Fundamental Crypto Asset Score (FCAS), which measures the fundamental health of cryptocurrency projects. Additionally, Flipside Crypto collaborates with partners like CoinMarketCap and Messari to distribute its analytics. The company is backed by notable investors, including Coinbase Ventures and True Ventures.

DUST Identity

Seed Round in 2018
DUST Identity, Inc. develops an authentication system technology that utilizes nano-diamonds to create an unclonable identity layer on any object for any supply chain. It also provides an optical scanner and cloud-based infrastructure that provides an interface to the object identity. DUST Identity, Inc. was formerly known as Diamond Nanotechnalogies, Inc. The company was founded in 2011 and is based in Framingham, Massachusetts with an additional office in Princeton, New Jersey.

ZenLedger

Seed Round in 2018
ZenLedger, Inc. is a software company that specializes in cryptocurrency tax management, founded in 2017 and headquartered in Bellevue, Washington. The company provides a comprehensive tax tool designed for cryptocurrency investors and accountants, allowing users to easily import their cryptocurrency transactions, calculate gains and income, and prepare tax returns. ZenLedger's platform generates various essential documents, including profit/loss statements, capital gains reports, and income reports, thereby simplifying the tax reporting process for miners, day traders, and long-term holders. It is compatible with a wide range of exchanges, currencies, and wallets, making it a versatile solution for both individual investors and tax professionals. By automating the tax preparation process, ZenLedger aims to alleviate the complexities and challenges associated with cryptocurrency taxation.