Behind the Buy: Strengthening Rain’s Core Infrastructure with Fern

Stablecoins are entering a new phase of adoption. More fiat-based companies are beginning to integrate stablecoins into their core products, and developers are expecting infrastructure that works reliably at global scale. As this shift accelerates, the requirements on the underlying technology become more demanding. Stablecoin platforms must provide reliable ways to move value between multiple fiat currencies and onchain environments, and they must support stablecoins that operate across several blockchains.

To meet these needs, Rain has acquired Fern and is welcoming their experienced team as the newest Rainmakers. 

A key piece of the acquisition is Fern’s multiplex, a routing, orchestration, and compliance engine that connects diverse liquidity sources, evaluates user permissions, and determines the optimal path for converting between assets across chains. It provides a foundation that will support Rain’s future on- and off-ramp integrations and will strengthen the way stablecoins move across blockchain ecosystems. 

This acquisition represents an investment in the long-term foundations of Rain’s platform. It also reflects our shared belief that stablecoins will become a primary medium for global commerce, provided the infrastructure behind them is reliable, compliant, and flexible enough to support the next generation of enterprise applications.

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Why Fiat Connectivity Matters

The first major requirement for enterprise adoption is the ability to move smoothly between fiat and stablecoins. Companies want the benefits of stablecoins, such as global reach and faster settlement, but their users and treasury operations still need fiat accounts, local payment rails, and predictable compliance flows.

Moving value from fiat into stablecoins requires a set of integrations that are consistent, safe, and adaptable across large markets. It also requires strong compliance tooling that can evaluate user permissions, track onboarding, and apply transaction-level rules.

Fern’s multiplex provides the foundational layer for this. Its architecture includes standardized interfaces, a routing engine that evaluates available liquidity, and a compliance engine that checks user permissions and transaction requirements. Together, these components form the pipes that will support Rain’s future on- and off-ramp integrations and allow us to build fiat connectivity in a more flexible and scalable way.

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Why Interoperability Matters

As more value moves onchain, interoperability becomes equally important. Stablecoins today operate across several major networks, and enterprises increasingly need their assets to move between chains without added complexity or risk.

Interoperability is the layer that allows users and developers to treat stablecoins as a unified system rather than a collection of isolated networks. It improves liquidity, simplifies user experience, and gives developers the flexibility to incorporate the best tools available on each chain.

The multiplex helps enable this by providing a routing layer that can evaluate multiple conversion paths and select the most efficient one across different liquidity sources. This type of routing becomes essential as enterprises launch multi-chain programs and as users demand faster and more predictable movement of assets.

Strengthening interoperability is a core part of Rain’s vision for the onchain economy, and the multiplex gives us a strong foundation to build on.

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Get To Know The Multiplex

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The multiplex consists of four primary components:

1. APIs: A standardized set of endpoints that connect to various liquidity providers, bank partners, and blockchains.
2. Compliance Engine: A module that evaluates user permissions, onboarding status, and transaction-level requirements to ensure compliance before any action is taken.
3. Liquidity Pools: A connective layer of available, permissioned liquidity providers and bank partners that the multiplex can route through for customer transactions.
4. Router: A routing engine that evaluates available liquidity, compares conversion paths, and selects the optimal route for a given transaction.

This architecture gives Rain a modular system that can evolve to connect to new liquidity sources, new token standards, and new fiat partners.

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The Team Behind Fern

Technology alone is not enough. Building and scaling infrastructure of this type requires a team with deep experience in distributed systems, cross-chain routing, security, and developer tooling.

Fern’s engineering team brings that experience to Rain. Their work at Fern demonstrates a commitment to reliability, technical rigor, and thoughtful design. The team includes senior backend and full-stack engineers who have spent years building complex systems in web3, payments, and infrastructure. Pooja Shah, who led both Filecoin and core product initiatives at Protocol Labs before founding Fern, joins Rain as Head of Product.

Their expertise will help accelerate Rain’s infrastructure roadmap and ensure that partners building on Rain benefit from stronger primitives over time.

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A Smooth Transition for Existing Fern Customers

All existing services will continue without interruption for Fern customers during the integration period. Existing API keys will remain active, and the same engineering team will support customers as we collaborate on a careful transition plan to integrate Fern’s products and brand into Rain.

Customers will receive direct updates on timing, migration steps, and how the multiplex will be integrated into Rain’s platform. Our focus is on continuity and clarity as we merge the systems.

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Looking Ahead

Stablecoins have reached a turning point. Their global utility is becoming apparent to enterprises, developers, and users around the world. To support that growth, platforms like Rain need a strong, flexible foundation that connects fiat and onchain value and supports seamless movement across blockchain ecosystems.

The acquisition of Fern strengthens that foundation. It positions Rain to serve the next generation of stablecoin use cases with greater reliability, deeper infrastructure, and a broader vision for what money movement can become.

We are excited about what this means for the builders and partners working with Rain today. Most importantly, we are excited about what this enables in the years ahead.

If you are building a product that relies on fast, compliant, and globally capable stablecoin infrastructure, we would love to work with you.