Card dependence has always been the structural vulnerability for high-risk merchants. Processors terminate accounts. Chargeback ratios creep past monitoring thresholds. Fees compound across interchange, scheme fees, and high-risk surcharges. For years, “diversify your payment mix” was standard advice with few practical options. Open banking A2A rails are changing that calculus in 2026, but the wins are vertical-specific and geography-bound. Here is where the numbers actually point.
The Economics Case Is Compelling
The fee gap is the easiest place to start. Open banking A2A payments cost merchants between 0.5% and 1% in the UK and EU, against card acceptance costs of 2% to 3.5% for high-risk accounts (often higher, once processor surcharges stack in). On one million in monthly volume, the saving runs to roughly $20,000 per month before factoring in chargeback costs.
Those chargeback costs matter more than the processing fee for most high-risk operators. A2A payments are bank-authorized and irrevocable: the buyer cannot initiate a chargeback after the payment clears because there is no card network to dispute through. Each card chargeback now carries an average of $128 in third-party fees and internal handling costs, per Mastercard 2025 data, and global chargeback volume is projected to grow 37% through 2029. For merchants already sitting close to VAMP or Mastercard Excessive Chargeback thresholds, removing even a slice of that exposure is a meaningful lever.
Where Traction Is Real
The verticals where open banking is winning share a common profile: high average order values, repeat billing, and elevated chargeback rates from friendly fraud or subscription confusion.
iGaming is the clearest example. Operators in regulated UK and EU markets are actively shifting volume from cards to A2A to reduce card declines (banks routinely block gaming transactions) and cut processing costs on high-frequency deposits. Instant settlement and zero chargeback exposure make A2A structurally superior for deposits where the regulatory environment permits it.
Subscriptions are the second major use case. UK subscription businesses alone were estimated to lose £102 billion to involuntary card churn in 2025, driven by expired cards and soft declines. Open banking recurring consent (Variable Recurring Payments in the UK, Pix Automatico in Brazil since June 2025) eliminates this failure mode entirely. For adult platforms and recurring digital billers with high card churn, A2A is not a marginal improvement: it removes a structural revenue leak.
Adult content and dating platforms add a third dimension: privacy. Bank transfers do not appear on card statements with merchant descriptor strings, which matters to a segment of customers who actively prefer that payments are not visible to a partner reviewing a shared account. Platforms that offer A2A as an option report that a meaningful share of higher-value customers self-select into it.
Where the Limits Are
Geography is the binding constraint. The UK and EU have the regulatory infrastructure and bank API coverage to make open banking practical at scale. The US is structurally behind: no mandated open banking regime, fragmented bank connectivity, and a consumer base trained on card rewards means A2A adoption is concentrated in specific corridors (ACH for recurring, Zelle for peer-to-peer) rather than at-checkout e-commerce. High-risk US merchants cannot treat open banking as a card alternative today.
There is also a customer experience gap. A2A requires a bank redirect and authentication step that adds friction, particularly on mobile. Conversion data from merchants who have rolled out A2A as an optional checkout method suggests it works best when positioned for specific segments (higher-value, privacy-sensitive, or repeat customers) rather than presented as the default.
The Strategic Read
Open banking is not replacing card networks for high-risk merchants and will not do so on any near-term horizon. What it is doing is offering a viable, materially cheaper, chargeback-free rail for specific verticals in specific geographies where the pain of card dependence is highest. UK and EU merchants in iGaming, subscriptions, and adult verticals have a genuine case for routing a meaningful share of volume through A2A today.
For US-facing businesses, the more immediate parallel is stablecoins, which are filling a similar structural role in gambling and adult verticals. Crypto gambling hit an estimated $81 billion in 2025, with stablecoins accounting for over 50% of crypto wager volume. The underlying logic is the same: find the transaction types where card infrastructure is most costly or most fragile, and route those selectively. That is the playbook, not a wholesale platform migration.
