Open-Loop vs Closed-Loop Networks
This is a fundamental distinction in payment networks that affects competition, pricing, and merchant relationships.
Open-Loop Networks (Visa, Mastercard)
Open-loop networks act as neutral intermediaries, allowing any bank to participate on either side of the transaction.
How Open-Loop Works
ANY BANK ANY BANK
can issue can acquire
│ │
▼ ▼
┌─────────────────┐ ┌─────────────────┐
│ ISSUING BANK │ │ ACQUIRING BANK │
│ │ │ │
│ • Chase │ ┌───────────────┐ │ • Wells Fargo │
│ • BofA │◀──────▶│ CARD NETWORK │◀────────▶│ • Chase │
│ • Citi │ │ (Visa / MC) │ │ • Worldpay │
│ • Capital One │ └───────────────┘ │ │
│ • Any bank │ │ │ • Any bank │
└─────────────────┘ │ └─────────────────┘
│
┌─────────────┴─────────────┐
│ Network provides: │
│ • Transaction routing │
│ • Rules & standards │
│ • Brand recognition │
│ • Dispute resolution │
│ • Settlement calculation │
└───────────────────────────┘
Open-Loop Characteristics
COMPETITION
- Multiple issuers compete for cardholders
- Multiple acquirers compete for merchants
- Network is a neutral intermediary
- Greater competition = better rates/rewards
FEE STRUCTURE
- Interchange paid from acquirer to issuer
- Network charges assessment fees to both sides
- Acquirer adds markup for profit
- Total merchant fee typically 2-2.5%
RELATIONSHIPS
- Banks have direct cardholder relationships
- Acquirers have direct merchant relationships
- Network has no direct end-user relationships
- Network is a B2B2B2C business
MARKET DYNAMICS
- Issuers compete on rewards and features
- Acquirers compete on pricing and service
- Creates "interchange arms race" for better rewards
- Merchant acceptance is widespread
Closed-Loop Networks (Amex, Discover)
Closed-loop networks control the entire value chain, acting as issuer, acquirer, AND network simultaneously.
How Closed-Loop Works
┌─────────────────────────────────┐
│ AMERICAN EXPRESS │
│ │
│ Acts as ALL THREE: │
│ ✓ Card Network │
│ ✓ Issuing Bank │
│ ✓ Acquiring Bank │
└─────────────────────────────────┘
▲ ▲
│ │
Issues cards │ │ Signs merchants
│ │ directly
▼ ▼
┌─────────────┐ ┌─────────────┐
│ CARDHOLDER │ │ MERCHANT │
└─────────────┘ └─────────────┘
Closed-Loop Characteristics
CONTROL
- Single entity controls entire experience
- Direct relationship with both cardholders AND merchants
- No intermediary banks needed
- Premium card positioning
FEE STRUCTURE
- No interchange in traditional model—they keep the entire merchant discount
- Higher merchant fees (no competition)
- Typical merchant fee: 2.5-3.5%
- All revenue stays with the network
DATA & INSIGHTS
- Better data/insights (sees both sides)
- Complete transaction visibility
- No information fragmentation
- Enhanced fraud detection capability
MARKET POSITION
- Premium card positioning
- Higher income cardholders
- Selective merchant acceptance
- Strong brand differentiation
The Evolution: Hybrid Models
The pure closed-loop model is evolving as networks adapt to market demands.
American Express Transformations
AMEX CO-BRANDED CARDS
Amex now partners with banks to issue co-branded cards:
- Wells Fargo issues Amex cards
- Cards carry Amex brand but issued by partner bank
- Internal interchange-like structure exists
- Blurs the line between open and closed loop
OPTBLUE PROGRAM
Amex created a de facto open-loop model for smaller merchants:
- Third-party processors can handle Amex transactions
- Similar to Visa/MC acquiring model
- Creates interchange-like fee structure
- Makes Amex acceptance easier for small merchants
- Amex co-branded cards (issued by partner banks like Wells Fargo) DO have an interchange-like structure internally
- OptBlue Program: Amex now allows third-party processors to handle merchants, creating a de facto interchange model for smaller merchants
- The "pure" closed-loop model is becoming less common
Comparison Table
| Aspect | Open-Loop (Visa/MC) | Closed-Loop (Amex) |
|---|---|---|
| Card issuance | Any member bank | Network itself (primarily) |
| Merchant acquiring | Any member bank | Network itself |
| Competition | High (many issuers/acquirers) | Low (one entity) |
| Merchant fees | Lower (~2-2.5%) | Higher (~2.5-3.5%) |
| Cardholder rewards | Funded by interchange | Funded by merchant fees |
| Data access | Fragmented | Complete view |
| Global acceptance | Very high | Lower |
| Market positioning | Mass market | Premium segment |
| Innovation speed | Slower (coordination) | Faster (single entity) |
| Regulatory exposure | Distributed | Concentrated |
Why This Distinction Matters
For Merchants
OPEN-LOOP IMPLICATIONS:
- Lower merchant fees due to competition
- Wide acceptance = customer expectation
- Must accept all card types (Honor All Cards rule)
- Interchange not negotiable
CLOSED-LOOP IMPLICATIONS:
- Higher merchant fees
- Can choose not to accept (e.g., some merchants don't take Amex)
- Direct relationship with network
- Premium customer demographic
For PayFacs and Platforms
PRICING CONSIDERATIONS:
- Open-loop costs more predictable
- Closed-loop adds complexity (separate agreements)
- Mixed acceptance affects merchant experience
- Need to understand blended rates
INTEGRATION COMPLEXITY:
- Visa/MC similar integration patterns
- Amex may require separate agreement
- OptBlue simplifies Amex for small merchants
- Discover similar to Amex but smaller volume
For Consumers
OPEN-LOOP BENEFITS:
- Intense rewards competition
- More card choices
- Universal acceptance
- Bank relationship continuity
CLOSED-LOOP BENEFITS:
- Premium card features
- Superior customer service
- Better fraud protection (complete visibility)
- Aspirational brand value
Real-World Examples
Open-Loop Scenario
Chase Sapphire Preferred at Starbucks:
1. Customer taps Chase Sapphire Preferred (Visa)
2. Starbucks processor → Visa Network
3. Visa routes to Chase (issuer)
4. Chase approves/declines
5. Money flow: Chase → Interchange → Starbucks' acquirer → Starbucks
Parties involved:
- Cardholder: Customer
- Issuer: Chase
- Network: Visa
- Acquirer: Starbucks' processor (e.g., Square)
- Merchant: Starbucks
Closed-Loop Scenario
American Express Gold at Starbucks:
1. Customer taps Amex Gold
2. Starbucks processor → American Express directly
3. Amex approves/declines (they know the cardholder)
4. Money flow: Amex → Starbucks (Amex keeps full merchant discount)
Parties involved:
- Cardholder: Customer
- Issuer/Network/Acquirer: American Express (all three roles)
- Merchant: Starbucks
Key Difference: In the Amex scenario, there's no interchange because Amex is both issuer and acquirer—they keep the entire merchant discount.
Strategic Implications
For Building a PayFac
OPEN-LOOP CONSIDERATIONS:
- Requires sponsor bank relationship
- Master MID aggregates volume
- Interchange flows predictably
- Must follow network rules strictly
- Easier to support (standardized)
CLOSED-LOOP CONSIDERATIONS:
- May require direct network agreement
- Separate pricing structure
- Higher merchant cost if passed through
- OptBlue simplifies for small merchants
- May be optional for small merchants
For Merchant Acceptance Strategy
ACCEPTING ALL NETWORKS:
- Maximizes customer convenience
- Increases costs (Amex is expensive)
- Industry standard for retail/restaurant
- Required for premium positioning
SELECTIVE ACCEPTANCE:
- Lower costs (skip Amex/Discover)
- Risk losing 10-15% of potential customers
- Common in low-margin businesses
- May signal "discount" positioning
Historical Context
Why Open-Loop Developed
VISA'S ORIGINS (1958-1970s):
- Bank of America created BankAmericard
- Licensed to other banks (couldn't expand nationally)
- Became Visa (network owned by member banks)
- Enabled nationwide/global reach
MASTERCARD'S ORIGINS (1966-1970s):
- Regional banks formed Interbank Card Association
- Competing banks pooled resources
- Became Mastercard (bank-owned cooperative)
- Similar model to Visa
Why Closed-Loop Persisted
AMERICAN EXPRESS (1850s-present):
- Started as express mail and travelers checks
- Direct customer relationships from day one
- Premium positioning from the start
- Never needed bank partners
- Brand value tied to exclusivity
DISCOVER (1985-present):
- Launched by Sears to compete with credit cards
- Built own network from scratch
- Originally Sears customers only
- Evolved to broader acceptance
Key Takeaways
-
Open-loop creates competition - Multiple banks on each side drive innovation and competitive pricing
-
Closed-loop provides control - Single entity can optimize experience but faces higher costs
-
The models are converging - Amex's OptBlue and co-branded cards blur the distinction
-
Merchant fees reflect the model - Closed-loop typically costs 0.5-1% more due to lack of competition
-
PayFacs must support both - Real-world platforms need to handle open and closed-loop networks
Related Topics
Card Network Fundamentals:
- Card Network Role Overview - What card networks do
- Transaction Routing - How BIN routing works
Business Models:
- The Four-Party Model - Open-loop explained in depth
- PayFac Position - How PayFacs fit into network models
Next Steps:
- Network Rules and Compliance - How networks govern participants
- Network Fees - Understanding assessment fees
Continue learning: Transaction Routing