Announcing Iron

We’re excited to announce that Iron, the stablecoin payments platform acquired by MoonPay for over $100M, has chosen Dfns to power its wallet infrastructure. After Stripe’s $1.1B acquisition of Bridge and Mastercard’s $1.8B acquisition of BVNK, one thing has become clear: stablecoins are no longer an experiment. They are becoming the foundation of next-generation payment infrastructure. In Europe, Iron is emerging as one of the most compelling examples of how to design and operate on these new rails.

Since going live, Iron has been running on Dfns to support real-world payment flows across fiat and stablecoin systems bringing together bank-grade security, deterministic execution, and global scalability.

Iron, building the programmable rails of money movement

Iron is building what it calls the Onchain Payments Stack (OPS), a unified, API-first infrastructure layer designed to make stablecoins usable in real financial systems. The ambition is to turn stablecoins into the default standard for moving money globally.

Originally launched in Germany, Iron started as a Solana-native platform before expanding across multiple blockchains and integrating fiat rails. Today, it provides a single API that abstracts the full complexity of modern payments, combining on/off-ramps, cross-border transfers, virtual accounts, treasury flows, swaps, and compliance into one coherent system. This allows fintechs, PSPs, and enterprises to integrate stablecoin-powered payments in days rather than months, without dealing with fragmented crypto infrastructure or regulatory complexity.

The platform is designed primarily for B2B use cases (e.g., global payroll, intercompany flows, merchant payouts, cross-border trade, and treasury operations) where transactions are high-value, operationally complex, and require precision from day one.

What differentiates Iron is not just coverage, but integrations. Fiat rails, stablecoins, FX, and compliance are not separate modules—they are part of a single programmable interface. Businesses can hold funds in multi-currency virtual accounts, move seamlessly between fiat and stablecoins, and operate across regions including Europe and Latin America with built-in compliance.

Behind the product is a team with deep experience across both crypto and regulated finance. The founders previously built Ultimate, a Solana-native wallet acquired by Jupiter, and co-founded Börse Stuttgart Digital Exchange, one of Europe’s first BaFin-regulated crypto trading venues. The broader team brings experience from Solarisbank, Trade Republic, N26, and Revolut, combining regulatory fluency with strong product execution.

The role of Dfns as the reliable execution and control layer

Within this stack, Dfns provides the wallet and execution layer that powers all onchain operations. Iron abstracts payments. Dfns ensures that every transaction behind the scenes is securely signed, correctly broadcast, and reliably settled.

To deliver this, Iron needed infrastructure that goes beyond basic custody. It required a system that is secure enough for institutional flows, programmable enough to integrate into complex product logic, and performant enough to handle large volumes without degradation. Dfns provides that foundation.

Our API-first wallet infrastructure allows Iron to orchestrate transactions, approvals, and treasury operations entirely programmatically, without relying on manual processes or rigid tooling. Key material is protected using MPC, TSS, and secure enclave architectures, ensuring strong security guarantees while maintaining high availability.

Performance is equally critical. The system is designed for low latency and high throughput across chains, with full control over node behavior and no reliance on shared RPC endpoints. But in payments, the defining factor is reliability. Blockchain transactions are inherently non-deterministic. They can fail silently, be dropped, or behave inconsistently depending on network conditions. At scale, these are not edge cases, they are the main problem. Dfns addresses this with a deterministic execution layer, detailed in a previous article.

Our infrastructure continuously monitors transaction state, reindexes blockchain data, and automatically rebroadcasts transactions when needed. Failures are handled proactively, not reactively, and without developer intervention. At the API level, strict idempotency guarantees prevent duplicate transactions and eliminate race conditions. Every transaction either completes successfully or fails cleanly, removing ambiguity from the system. This level of control is further extended through our transaction orchestration model described earlier.

A unified system for modern financial infrastructure

The combination of MoonPay and Iron represents a new generation of financial infrastructure. MoonPay brings global distribution, fiat connectivity, and regulatory reach across more than 160 countries. Iron provides the programmable API layer for stablecoin payments, treasury, and cross-border flows. Dfns provides the execution layer that ensures everything works reliably on-chain.

Together, these systems allow Iron to operate with near-zero transaction failure rates, even under high throughput and complex payment flows. This creates a system where businesses can move money globally in minutes, operate seamlessly across fiat and stablecoin rails, and build programmable financial products without managing fragmented infrastructure. What is emerging is not just a better crypto payment stack, but a new financial architecture.

Stablecoins are becoming a core primitive. APIs are replacing manual workflows. Infrastructure is becoming composable, programmable, and global by default. Iron, powered by Dfns and scaled through MoonPay, is part of that shift. Not as an experiment, but as infrastructure already supporting real-world financial flows at scale.

Build on Dfns today: app.dfns.io/get-started