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Raises
Castle Island Ventures
Total Investments72
Infrastructure14
CeFi7
DeFi6
Analytics4
Taxes3
Payments3
L12
NFT2
Banking2
Liquid Staking Protocol2
Centralized Exchange2
L22
Stablecoin1
Mining1
Liquid Restaking Protocol1
Web31
Stablecoin Infrastructure1
RWA1
Social Platform1
Prediction Market1
Insurance1
| Name | Round | Category | Description | Lead Investor | Chains | Other Investors | |||
|---|---|---|---|---|---|---|---|---|---|
| Valinor | 30 Mar 2026 | $25m | Seed | Banking | Valinor is a credit-focused financial firm bridging traditional capital markets and on-chain finance. It provides investing, capital markets, and advisory services aimed at expanding access to credit through blockchain-based infrastructure | Castle Island Ventures | SIG DT Investments, Maven 11 | ||
| XFX | 26 Mar 2026 | $17m | Series A | Banking | XFX is an institutional cross-border settlement platform enabling real-time movement of fiat and stablecoins. It provides access to liquidity, instant settlement, and enterprise-grade reporting via APIs and dashboards, with a focus on compliance, transparency, and efficient capital use | Castle Island Ventures | Coinbase Ventures, Haun Ventures | ||
| Cyclops | 04 Mar 2026 | $8m | Strategic | Payments | Cyclops builds a platform for payment processors and fintech companies that lets them integrate crypto and stablecoins into their existing payment systems | Castle Island Ventures, F Prime, Shift4 | |||
| Birch Hill Holdings | 11 Feb 2026 | $2.5m | Pre-Seed | RWA | Birch Hill Holdings is a digital asset infrastructure firm focused on institutional on-chain finance, specializing in RWA tokenization and on-chain credit management. It provides credit underwriting, structured token issuance, vault and risk configuration, and ongoing monitoring and compliance to bridge traditional credit markets with DeFi. | ParaFi Capital, Castle Island Ventures | Nascent, FalconX, Flowdesk, The Operating Group, Polaris Fund, Escape Velocity, JST Capital | ||
| Project Eleven | 14 Jan 2026 | $20m | Series A | Infrastructure | Project Eleven is an applied quantum computing lab focused on protecting blockchains and digital assets from quantum threats. It develops quantum-resilient cryptographic tools, including Yellowpages, which links existing Bitcoin addresses to post-quantum keys without requiring on-chain transactions | Castle Island Ventures | $120m | Coinbase Ventures, Lattice Fund, Variant Fund, Nascent, Quantonation, Balaji Srinivasan | |
| Gondor | 05 Dec 2025 | $2.5m | Pre-Seed | Prediction Market | Building the DeFi layer for prediction markets | Maven 11, Castle Island Ventures, Prelude | |||
| Arx Research | 06 Nov 2025 | $6.1m | Seed | Infrastructure | Arx Research builds hardware and protocols for on-chain authentication and crypto payments. Its HaLo chips embed cryptographic identities into physical items, enabling verifiable ownership, Physically Backed Tokens (PBTs), and secure NFC interactions. The company also develops the Burner Terminal, an EMV-certified device supporting both stablecoin and card payments for on-chain and traditional transactions | Castle Island Ventures | 1kx, Inflection, Seed Club Ventures, Placeholder | ||
| Tesser | 21 Oct 2025 | $4.5m | Seed | Payments | Tesser provides a regulated, enterprise-grade platform allowing financial institutions to integrate stablecoin payments, treasury and treasury-operations infrastructure into fiat rails for faster, cheaper global money movement | Castle Island Ventures | Anthemis Group, Strobe Ventures | ||
| RockSolid | 25 Sep 2025 | $2.8m | Pre-Seed | Insurance | RockSolid is an on-chain insurance marketplace that provides parametric coverage for assets such as bridges, stablecoins, and staking protocols, delivering fast, transparent payouts through smart contracts without manual claims | Castle Island Ventures | GSR, Kindred Ventures, Blockchain Builders Fund, IDEO CoLab Ventures, Stanford Blockchain, Rocket Pool, Pier Two | ||
| BOB | 07 Aug 2025 | $9.5m | Strategic | L2 | Bitcoin layer-2 network that's compatible with the Ethereum Virtual Machine (EVM) standard | CMS Holdings, IOSG Ventures, Hypershere, Amber Group, RockawayX, Castle Island Ventures, Bankless Ventures, Daedalus, Asymmetric Ventures, Ledger, Cathay Capital, Sats Ventures, Sigil Fund | |||
| Stable | 31 Jul 2025 | $28m | Seed | L1 | Stable is a Layer 1 blockchain built for stablecoin-native applications, using USDT (Tether) as its gas token. It enables zero-fee peer-to-peer USDT transfers and supports smart contracts that operate directly in stablecoins. Its USDT0 system allows cross-chain USDT transfers without bridges. The platform offers a gas-less user experience, integrated fiat on-ramps, and high throughput, targeting use cases like cross-border payments, treasury management, FX, and institutional finance | Bitfinex, Hack VC, USDT0 | Franklin Templeton, eGirl Capital, Castle Island Ventures, Bybit, Mirana Ventures, SIG DT Investments, Nascent, Blue Pool Capital, BTSE, KuCoin Ventures, Gate Ventures | ||
| Pear Protocol | 28 Jul 2025 | $4.1m | Strategic | DeFi | Pear Protocol is a DeFi-native pair‑trading platform that has launched a native integration with Hyperliquid’s decentralized perpetual order book, enabling one‑click long/short trading on token pairs with advanced order types, ratio‑based limit and TWAP execution, TP/SL risk logic, and direct ratio charting | Castle Island Ventures | Compound Ventures, Sigil Fund, Florin Digital | ||
| Project Eleven | 19 Jun 2025 | $6m | Infrastructure | Project Eleven, a firm focused on addressing the quantum computing threat to digital assets, particularly Bitcoin | Variant, Quantonation | Castle Island Ventures | |||
| XFX | 17 Jun 2025 | $9.1m | Seed | CeFi | XFX is building the institutional infrastructure for cross-border settlement | Haun Ventures | Castle Island Ventures, Oak HC FT, Maya Capital, Coinbase Ventures, Paxos, Bitso | ||
| TYB — Try Your Best | 11 Jun 2025 | $11m | Series A | Social Platform | TYB is a Web3-native community rewards platform built on Avalanche | Offline Ventures, Strobe Ventures | Coinbase Ventures, Castle Island Ventures, Unusual Ventures | ||
| Beam Cash | 27 May 2025 | $7m | Payments | Beam is a stablecoin-based PSP built to deliver faster, cheaper, and smarter global money movement | Castle Island Ventures | Archetype, Verda Ventures, Bankless Ventures, Arca | |||
| Nirvana Labs | 12 May 2025 | $6m | Seed | Infrastructure | a blockchain-optimized cloud startup | Jump Crypto, Crucible Capital | RW3 Ventures, Castle Island Ventures, Hash3 | ||
| Coala Pay | 07 Feb 2025 | $3.5m | Seed | Stablecoin Infrastructure | Castle Island Ventures | Lattice Fund, Factor Capital | |||
| Hata | 22 Oct 2024 | $4.2m | Seed | Centralized Exchange | Hata is a global cryptocurrency exchange that allows users to buy, sell, and trade crypto assets with fiat currencies | Castle Island Ventures | Cadenza Capital, Bybit, Plug and Play, AP Capital, AllianceDAO | ||
| delta | 09 Oct 2024 | $11m | Infrastructure | delta - a network of networks with shared state | Variant Fund, DBA, Figment Capital, Maven 11, Reverie, Castle Island Ventures, Credibly Neutral, Ambush, Delphi Ventures, Robot Ventures, Public Works, komorebi, Ergodic Capital, Zero Knowledge | ||||
| SatLayer | 22 Aug 2024 | $8m | Pre-Seed | Liquid Restaking Protocol | Bitcoin restaking platform | Hack VC, Castle Island Ventures | Franklin Templeton, OKX Ventures, Mirana Ventures, Big Brain Holdings, Amber Group, CMS Holdings, MH Ventures | ||
| Arch | 22 Aug 2024 | $5m | Seed | CeFi | crypto backed loans | Morgan Creek Digital, Castle Island Ventures | Galaxy, BitGo | ||
| Andrena | 07 Aug 2024 | $18m | Series A+ | decentralized physical infrastructure network (DePIN) protocol aimed at providing decentralized internet services | Dragonfly. | CMT Digital, Castle Island Ventures, Wintermute Ventures, ParaFi Capital, 6th Man Ventures |