Stablecoins Hit 40M Retail Terminals

Stablecoins are no longer confined to DeFi dashboards and crypto-native apps. In the span of a single quarter, two major partnerships have brought stablecoin payments to physical retail at global scale — and the infrastructure behind them is something every fintech developer and crypto developer in the UK should understand. Ingenico has launched native stablecoin checkout across its 40 million Android POS terminals via WalletConnect Pay, whilst Paysafe has integrated MoonPay's stablecoin rails into its $167 billion-a-year payment platform. For payment developers, the message is clear: stablecoin acceptance at the point of sale is now production infrastructure, not a pilot programme.

How Stablecoin Checkout Works at Physical POS

The Ingenico-WalletConnect integration is the first to bring native stablecoin payments to physical retail terminals without requiring new hardware. Here is how the flow works from a payment developer's perspective:

1. Customer initiates payment. At checkout, the customer selects stablecoin as their payment method. The Ingenico Android terminal displays a QR code or initiates a WalletConnect session. 2. Wallet connection. The customer scans the QR code with any of 700+ compatible wallets connected through the WalletConnect protocol — serving over half a billion crypto users globally. 3. Stablecoin transfer. The customer authorises the payment in their wallet. Supported stablecoins include USDC, EURC, and USDT across multiple blockchains. 4. Fiat conversion and settlement. WalletConnect Pay handles the conversion from stablecoin to fiat currency. The merchant receives settlement in their local currency through their existing acquirer — no crypto touches the merchant's balance sheet.

The critical architectural insight is that WalletConnect Pay operates as a "messaging layer that sits alongside settlement." It abstracts blockchain complexity entirely from the merchant. As WalletConnect Pay CEO Jess Houlgrave put it: "The payments company and the merchant shouldn't even need to know about any of this stuff. They should just be able to serve this as an offering."

For Ingenico, this means the Digital Currency Application runs on existing Android terminals — no hardware swap, no new integration for acquirers beyond enabling the app. The potential reach is staggering: 40 million POS units across 120 countries.

Paysafe and MoonPay: Stablecoin Rails Inside a $167B Platform

The second major development is Paysafe's integration of MoonPay's crypto payment infrastructure, announced on 8 April 2026. Paysafe processed $167 billion in transactions in 2025 — this is not a niche crypto processor, but a mainstream payment platform serving e-commerce, financial services, retail, and iGaming.

The integration introduces "Pay with Crypto," enabling merchants to accept cryptocurrency deposits that MoonPay's Commerce Checkouts technology instantly converts to US dollars. The settlement architecture gives merchants two options:

• Instant stablecoin settlement — funds arrive in the merchant's crypto wallet within seconds
• Fiat settlement — funds convert to USD, EUR, GBP, or other major currencies via MoonPay's Virtual Accounts, powered by Iron (MoonPay's stablecoin infrastructure platform)

Iron, acquired by MoonPay in 2025, is the critical piece. It provides virtual accounts that accept fiat deposits in USD, EUR, and GBP with automatic stablecoin conversion — and the reverse. For payment developers building on this stack, Iron offers a single API that handles ramps, payouts, compliance, and reconciliation backed by MoonPay's global licensing.

MoonPay CEO Ivan Soto-Wright framed it directly: "Crypto rails are making payments faster and cheaper, and our job is to close the gap between this technology and real-world utility."

The Technical Architecture Payment Developers Need to Understand

Both partnerships reveal a common architectural pattern that is becoming the standard for crypto-to-fiat retail payments. Understanding this pattern is essential for any fintech developer or cross-border payments engineer building in this space.

The Abstraction Layer Pattern

Neither Ingenico nor Paysafe merchants interact with blockchains directly. Instead, an intermediary layer (WalletConnect Pay or MoonPay/Iron) handles:

• Wallet orchestration — connecting to hundreds of wallets across multiple protocols
• Stablecoin routing — selecting the optimal blockchain for settlement based on cost and speed
• Fiat conversion — real-time on/off-ramping with compliance checks
• Merchant settlement — delivering funds through conventional acquiring rails

This is architecturally similar to how payment orchestration platforms like Stripe or Adyen abstract card network complexity. The difference is that the "network" layer is now a blockchain rather than Visa or Mastercard.

Building Stablecoin-Aware POS Infrastructure

For payment developers looking to build similar infrastructure, the key engineering challenges are:

Multi-chain settlement routing. With stablecoins deployed across Ethereum, Solana, Polygon, Base, and dozens of other networks, your routing engine needs to identify which chain a customer's wallet uses and settle accordingly. This is a real-time decision that must factor in gas costs, confirmation times, and liquidity depth per chain — the kind of low-latency system that Rust or Go excels at. Compliance middleware. Every stablecoin transaction at a regulated POS terminal requires sanctions screening, AML checks, and transaction monitoring. This needs to happen in the payment flow without adding perceptible latency. Redis-backed caching of sanctions lists combined with asynchronous detailed screening is the common pattern. Reconciliation across rails. When merchants can settle in either fiat or stablecoins, your reconciliation engine must track both rails. PostgreSQL with double-entry bookkeeping patterns handles this well — but you need to account for blockchain confirmation finality, which varies from seconds (Solana) to minutes (Ethereum L1). Refund handling. Card-like refund timing with crypto settlement is a genuine engineering challenge. WalletConnect has noted near-instant refunds as a roadmap priority, but the current state requires careful state management between the blockchain transaction and the merchant's refund policy.

Why This Matters for the UK Fintech Ecosystem

The UK is uniquely positioned to benefit from stablecoin retail payments. The FCA's upcoming Long-Term Regulatory Framework for Open Banking, combined with HM Treasury's planned statutory instrument for open banking in Q4 2026, creates a regulatory environment where stablecoin payments can integrate with existing payment infrastructure rather than competing with it.

Consider the numbers: Open Banking payments in the UK are now valued at up to £43 billion annually. Stablecoins are projected to represent 3% of all US dollar payments in 2026, rising to 10% by 2031. Global stablecoin transaction volume exceeded $34 trillion in 2025. The convergence of these trends means UK open banking developers and payment developers will increasingly need to build systems that handle both traditional account-to-account payments and stablecoin settlement.

The new Payment Account Closure Regulations taking effect on 28 April 2026 — requiring 90 days' notice for account closures — also signal regulatory intent to stabilise the payment services landscape, creating a more predictable environment for building stablecoin infrastructure.

Key Takeaways for Crypto and Payment Developers

1. No new hardware required. Ingenico's 40 million existing Android terminals can accept stablecoins with a software update. If you are building POS integrations, target existing terminal platforms rather than proposing hardware changes.

2. The abstraction layer is the product. Both WalletConnect Pay and MoonPay/Iron succeed by hiding blockchain complexity from merchants. If you are building crypto payment infrastructure, invest in the abstraction layer — wallet orchestration, chain routing, and fiat conversion — not in asking merchants to understand crypto.

3. Dual-settlement is table stakes. Merchants want the choice of stablecoin or fiat settlement. Build your system to support both from day one, with PostgreSQL-based reconciliation that spans both rails.

4. Compliance is the moat. Sanctions screening, AML, and transaction monitoring at POS latency requirements is genuinely hard engineering. This is where Rust-based payment infrastructure shines — combining performance with safety guarantees.

5. The UK market is ready. Regulatory clarity from the FCA, Open Banking infrastructure, and a sophisticated merchant base make the UK one of the best markets to deploy stablecoin retail payments. Fintech developers in the UK should be building for this now.

The gap between "paying with your phone" and "paying with stablecoins" has effectively collapsed. Tom Wang sees this as the inflection point where crypto payment infrastructure stops being a parallel universe and starts merging with the retail payment stack that billions of people use every day. The engineering challenge now is not whether stablecoins can work at the point of sale — it is how fast payment developers can build the abstraction layers that make it seamless.