TL;DR: A card scheme is the network that connects consumers, merchants, and banks. Visa and Mastercard have dominated for 50 years. Blockchain enables a third option - one with instant settlement, zero chargebacks, and peer-to-peer finality.
Understanding Payment Rails
When you tap your card at a coffee shop, you're not sending money directly to the merchant. You're initiating a complex dance between multiple parties:
Your bank (issuer) - Holds your account
Card network (Visa/MC) - Routes the transaction
Merchant's bank (acquirer) - Receives on behalf of merchant
Payment processor - Handles the technical connection
The merchant - Finally gets paid (days later)
The "card scheme" is the network layer - the rules, protocols, and infrastructure that make this work across millions of merchants and billions of cards.
The Duopoly Problem
Today, two companies control this infrastructure:
| Network | US Market Share | Founded |
| Visa | ~54.9% | 1958 |
| Mastercard | ~38.7% | 1966 |
| Others (Amex, Discover, UnionPay) | ~6.4% | Various |
For most practical purposes, if you want to accept card payments, you're paying Visa or Mastercard. They set the rules. They set the fees. They set the settlement times.
And those rules haven't fundamentally changed since the 1970s.
Why Legacy Rails Are Slow and Expensive
The card network architecture was designed when:
Batch processing happened overnight
Fraud detection was manual
International transfers took weeks
Computing power was expensive
So they built in:
3-5 day settlement - Because batch processing was the only option
2-3% fees - To cover fraud losses, dispute handling, and network costs
Chargeback rights - Because there was no way to verify transactions cryptographically
Intermediary chains - Because direct merchant-consumer connections weren't possible
These aren't features. They're technical debt from 50 years ago.
What a Modern Card Scheme Looks Like
Blockchain technology enables a fundamentally different architecture:
| Aspect | Legacy (Visa/MC) | Modern (Blockchain) |
| Settlement | 3-5 business days | Under 5 seconds |
| Fees | 2-3% | Near zero (gas only) |
| Chargebacks | Yes (reversible) | No (cryptographically final) |
| Intermediaries | 4-5 parties | 2 (sender and receiver) |
| Operating hours | Business days | 24/7/365 |
| Cross-border | Additional fees | Same as domestic |
This isn't incremental improvement. It's a generational leap.
The Amex Model: Coexistence, Not Replacement
When people hear "new card scheme," they imagine replacing Visa overnight. That's not how payment networks work.
American Express launched in 1958 - the same year as Visa. 65 years later, Amex still isn't accepted everywhere. But it's still a major payment network with a $150B+ market cap.
Amex succeeded by:
Targeting specific merchant categories first
Offering differentiated benefits (rewards, service)
Building acceptance gradually over decades
Coexisting with Visa/MC, not replacing them
A new card scheme doesn't need universal acceptance on day one. It needs:
A viable merchant network (even if limited initially)
Clear benefits over alternatives
Technical infrastructure that works
Patient expansion over time
How Blockchain Becomes a Card Scheme
The technical components exist:
Stablecoins - USDC, EURC provide the money layer. $300B market cap, $27.6T annual volume. The settlement currency is ready.
NFC Technology - The same tap-to-pay interface consumers already use. No new hardware required at terminals.
Smart Contracts - Programmable settlement rules. Instant, trustless, auditable.
Mobile Wallets - Self-custodial apps that can sign transactions. The "card" is your phone.
What was missing was the integration layer - the protocol that connects self-custodial wallets to existing merchant terminals using familiar tap-to-pay UX.
The PSP Opportunity
Payment Service Providers (PSPs) like Adyen, Worldpay, and Stripe connect merchants to card networks. They're the plumbing of payments.
For PSPs, a new card scheme offers:
Better economics:
New revenue streams:
Stablecoin on/off ramp fees
Yield on settlement float
Premium pricing for instant settlement
Competitive differentiation:
Offer merchants something competitors can't
Early mover advantage in stablecoin commerce
Future-proof infrastructure
PSPs don't need to believe in crypto ideology. They just need to see the unit economics.
The Merchant Perspective
For merchants, a new card scheme means:
Immediate benefits:
Same experience:
No crypto complexity:
The merchant doesn't need to "accept crypto." They just need to accept a new payment option that costs less than cards.
The Consumer Perspective
For consumers, the value proposition depends on the audience:
Crypto-native users:
Spend stablecoins directly
Keep self-custody until payment
Earn yield until moment of purchase
No more selling to fiat first
Mainstream users (eventually):
Another payment option at checkout
Potentially lower prices (merchants pass on savings)
Works the same as Apple Pay
The mainstream adoption follows merchant acceptance. Once enough places accept it, consumers have reason to try it.
Building Acceptance: The Chicken and Egg
Every new payment network faces the same challenge:
The solution is starting where both sides see immediate value:
Crypto-native consumers - Already have stablecoins, motivated to spend them
PSPs with stablecoin interest - See the economics, willing to pilot
Merchants with chargeback pain - High-fraud categories benefit most
Geographic concentration - Build density in specific markets first
This is how every payment network started. Visa didn't launch globally on day one.
The 10-Year View
In 2035, the payments landscape will be unrecognisable:
Stablecoin rails are the default for in-person payments - faster, cheaper, final
Visa and Mastercard are legacy infrastructure, used mainly for credit and cross-border fallback
The $125B chargeback industry no longer exists for participating merchants
PSPs without stablecoin settlement have lost market share or pivoted
Merchants won't accept 3-day settlement or 3% fees when instant and near-zero is available
"Card payment" becomes what "cash payment" is today - still around, but increasingly rare
The question isn't whether blockchain becomes a payment rail. It's who builds the infrastructure that makes it work.
What "Rail 3.0" Means
Rail 1.0 - Cash (physical, instant, irreversible)
Rail 2.0 - Cards (digital, slow, reversible)
Rail 3.0 - Blockchain (digital, instant, irreversible)
Rail 3.0 combines the finality of cash with the convenience of cards. That's the opportunity.
Xeno is building the infrastructure for Payment Rail 3.0 - a new card scheme alongside Visa and Mastercard. Learn how to integrate.
