How Much Does a Payment Gateway Cost? Fees, Pricing & Hidden Costs

A payment gateway sits between your checkout and the banks. It encrypts card details, routes the transaction to the right acquirer, and returns an approval or decline. Every gateway charges for this service, but the cost structure varies enormously between providers — and the sticker price rarely tells the full story.

This guide breaks down exactly what a payment gateway costs, the different pricing models, what the major providers charge, and the hidden costs that catch businesses out.

What Does a Payment Gateway Cost?

For most businesses, a payment gateway costs between 1.5% and 3.5% per transaction, plus a fixed fee of 10p to 30p per transaction. On top of that, you may pay monthly fees, setup fees, PCI compliance fees, and chargeback fees.

The total cost depends on your volume, average transaction value, card mix, and the provider you choose. A business processing £50,000 per month through Stripe at 2.9% + 30p would pay roughly £1,600 in gateway fees. The same volume through an interchange-plus provider might cost £900-£1,200.

The key distinction: some providers bundle everything into a single flat rate, while others break out interchange separately. Flat-rate is simpler. Interchange-plus is usually cheaper at scale.

Types of Payment Gateway Fees

Transaction Fees

The per-transaction charge is the largest cost for most businesses. It has two components:

• Percentage fee — a percentage of the transaction value (typically 1.4% to 3.5%)

• Fixed fee — a flat amount per transaction (typically 10p to 30p)

The percentage covers interchange, scheme fees, and the gateway's margin. The fixed fee covers processing costs that don't scale with transaction size.

For low-value transactions (under £5), the fixed fee becomes disproportionately expensive. A 20p fixed fee on a £2 transaction is 10% — far more than the percentage alone.

Monthly / Subscription Fees

Some gateways charge a monthly fee for account access, reporting dashboards, or advanced features. This ranges from £0 (Stripe, Square) to £25-£50/month (Authorize.net, some Worldpay plans).

Monthly fees are less significant at scale but can hurt small businesses processing fewer than 100 transactions per month.

Setup Fees

Most modern gateways have eliminated setup fees. Stripe, Square, and Adyen charge nothing to get started. Some legacy providers and enterprise acquirers still charge £50-£500 for account setup, integration support, or custom configuration.

If a provider charges a setup fee in 2026, question what you are getting for it. The market has moved past this.

PCI Compliance Fees

Any business that handles card data must comply with PCI DSS. Gateways handle this differently:

• Hosted payment pages / tokenisation — the gateway handles PCI scope for you, usually included in the transaction fee

• Non-compliance fees — some acquirers charge £5-£15/month if you haven't completed your PCI SAQ (Self-Assessment Questionnaire)

• Enterprise PCI — if you handle raw card data yourself, PCI compliance costs run into tens of thousands annually for audits, penetration testing, and infrastructure

For most businesses, using a gateway with hosted fields or a redirect-based checkout eliminates PCI compliance costs entirely.

Chargeback Fees

When a customer disputes a transaction, the gateway or acquirer charges a chargeback fee — typically £15-£25 per dispute, regardless of outcome. High chargeback rates (above 1%) can trigger monitoring programmes with additional penalties.

Some providers include chargeback protection or insurance as a paid add-on (0.4%-0.6% per transaction).

Cross-Border and Multi-Currency Fees

Processing international payments adds cost:

• Cross-border fee — charged when the card-issuing bank is in a different country to the merchant's acquirer. Typically 0.5% to 1.5% on top of domestic rates.

• Currency conversion fee — if you settle in a different currency to the transaction currency. Usually 1% to 2.5%.

• Scheme cross-border fees — Visa and Mastercard charge additional scheme fees on cross-border transactions.

For businesses with international customers, these fees can add 2-3% on top of the base transaction rate. Local acquiring — processing through an acquirer in the customer's country — is one way to reduce this.

Payment Gateway Pricing Models

Flat-Rate Pricing

A single blended rate for all transactions, regardless of card type or issuing bank.

Example: Stripe charges 2.9% + 30p for all domestic card transactions.

Pros: Simple, predictable. Easy to calculate margins. Cons: You pay the same rate for a debit card (which has low interchange) as for a corporate Amex (which has high interchange). At scale, you overpay on cheap transactions.

Best for: businesses processing under £50,000/month or those that prioritise simplicity over cost optimisation.

Interchange-Plus (Interchange++) Pricing

The gateway passes through the actual interchange rate and scheme fees, then adds a fixed markup.

Example: Adyen charges interchange + scheme fees + 0.10-0.12 EUR per transaction.

Pros: Transparent. You see exactly what interchange costs and what the gateway charges. Cheaper at scale because you benefit from low interchange on debit cards and regulated EU cards. Cons: More complex invoicing. Harder to predict exact costs month to month.

Best for: businesses processing over £50,000/month, those with a high proportion of debit cards, or any business operating in the EU (where interchange is capped at 0.2-0.3%).

Tiered Pricing

Transactions are grouped into tiers — qualified, mid-qualified, and non-qualified — each with a different rate. The gateway decides which tier a transaction falls into.

Pros: None, frankly. Cons: Opaque. The gateway controls tier assignment, and "non-qualified" rates (often 3%+) apply to a surprising proportion of transactions. This model is designed to make the headline rate look cheap while the effective rate is higher.

Best for: nobody. Avoid tiered pricing. It is the most expensive model for merchants and the least transparent.

Payment Gateway Cost Comparison (2026)

Important: These are published list prices. At volume (typically above £100,000/month), every provider on this list will negotiate. Stripe offers custom pricing from around 2.2% + 20p. Adyen and Checkout.com can get close to interchange + 5-8p per transaction for large merchants.

Hidden Costs Most Businesses Miss

1. Integration and Development Time

The gateway's API documentation may be free, but building, testing, and maintaining the integration is not. Budget 2-8 weeks of developer time for a basic integration, more for complex checkout flows or subscription billing.

This is a real cost. At £500-£800/day for a payments engineer, a four-week integration project costs £10,000-£16,000 before you process a single transaction.

2. Gateway Lock-In

Once you have built against a gateway's API, switching is expensive. You need to re-integrate, migrate stored card tokens (which some providers make deliberately difficult), update your reconciliation, and retest everything.

This lock-in gives the gateway leverage in pricing negotiations. If switching costs £30,000 in development time, a provider only needs to undercut your current rate enough to make the ROI work — and they know the switching cost.

The antidote is a PSP-neutral architecture that abstracts the gateway layer, so you can add or swap providers without rebuilding your checkout.

3. PCI Compliance at Scale

If you are a platform or marketplace handling payments on behalf of sub-merchants, your PCI scope expands significantly. Level 1 PCI compliance (for businesses processing over 6 million transactions per year) requires:

• Annual on-site audit by a Qualified Security Assessor (QSA)

• Quarterly network scans

• Penetration testing

• Dedicated security infrastructure

Total cost: £50,000-£200,000+ per year. This is why most platforms use tokenisation and hosted payment fields to keep card data out of their environment entirely.

4. Multi-Currency and Settlement Costs

If you accept payments in multiple currencies, the published transaction rate is only part of the picture. Look at:

• FX spread — the markup on the exchange rate when converting to your settlement currency (typically 1-2.5%)

• Settlement timing — some providers hold funds for longer on international transactions

• Multi-currency settlement — settling in the transaction currency avoids FX conversion but adds treasury complexity

5. Chargeback and Fraud Costs

Beyond the per-chargeback fee (£15-£25), high dispute rates trigger:

• Card scheme monitoring programmes (Visa VDMP, Mastercard ECM) with fines of £5,000-£25,000/month

• Increased processing rates

• Account termination in severe cases

Budget for fraud prevention tooling (3D Secure, risk scoring, manual review) as part of your total gateway cost.

How Platforms Pay Differently

If you are a software platform embedding payments for your users — rather than a single merchant accepting payments — the cost equation changes fundamentally.

The Platform Cost Stack

A platform typically pays:

1. Gateway/PSP fees — the underlying transaction processing cost

2. PayFac or orchestration fees — the cost of onboarding sub-merchants, managing KYC, and splitting payouts

3. Compliance overhead — PCI DSS, anti-money-laundering, and regulatory obligations

4. Integration and maintenance — engineering time to build and maintain the payments infrastructure

The gateway transaction fee is often the smallest part of the total cost. The real expense is in the infrastructure around it — the payment layer that connects your platform to one or more PSPs.

Multi-PSP Changes the Economics

Platforms locked into a single gateway pay whatever that provider charges. Platforms that can route transactions across multiple PSPs gain:

• Competitive leverage — negotiate rates with multiple providers and shift volume to the cheapest

• Lower interchange — route transactions to local acquirers in each market, avoiding cross-border fees

• Resilience — if one provider goes down, traffic routes to another. Downtime is its own cost

The upfront cost of multi-PSP architecture is higher, but the long-term savings on a business processing £10M+ annually typically pay for the infrastructure many times over. Read more in our enterprise PSP mandate guide.

How to Reduce Payment Gateway Costs

1. Negotiate Based on Volume

Published rates are starting points. If you process over £50,000/month, request custom pricing. If you process over £500,000/month, you should be on interchange-plus with a markup of 0.1% or less.

2. Optimise for Interchange

Interchange is the largest component of your processing cost. Reduce it by:

• Sending Level 2/3 transaction data for B2B payments (can reduce interchange by 0.5-1%)

• Using 3D Secure authentication (triggers lower interchange categories)

• Encouraging debit card payments over credit cards

3. Use Local Acquiring

For international transactions, process through an acquirer in the customer's country to avoid cross-border fees. This alone can save 1-2% per transaction on international volume. Payment orchestration makes this operationally practical.

4. Review Your Effective Rate Monthly

Your effective rate = total fees paid / total volume processed. Compare this to your contracted rate. If they differ significantly, dig into the transaction-level data to find where the overcharges are — cross-border fees, downgrades, and scheme fee increases are common culprits.

5. Avoid Gateway Lock-In

Build with portability in mind. Use tokenisation standards, abstract your gateway integration behind an internal API, or work with a PSP-neutral payment layer that lets you add and swap providers without re-engineering your checkout.

Frequently Asked Questions

How much does a payment gateway cost per transaction?

Most payment gateways charge between 1.5% and 3.5% of the transaction value, plus a fixed fee of 10p to 30p per transaction. Flat-rate providers like Stripe charge 2.9% + 30p. Interchange-plus providers like Adyen pass through the actual interchange rate (as low as 0.2% for EU debit cards) and add a small fixed markup.

Are there free payment gateways?

No payment gateway is free — they all charge per-transaction fees. However, many (Stripe, Square, Adyen) have eliminated monthly fees and setup fees, so you only pay when you process transactions. The per-transaction fee is the gateway's revenue.

What is the cheapest payment gateway in the UK?

For small businesses, Square (2.6% + 10p for online payments) is often the cheapest flat-rate option. For businesses processing over £50,000/month, interchange-plus providers like Adyen or Checkout.com are typically cheaper because EU interchange is capped at 0.2-0.3% for consumer cards. Your effective rate on interchange-plus can be as low as 0.5-0.8% for debit-heavy merchants.

How much does PCI compliance cost?

For most businesses using hosted payment fields or a redirect-based checkout, PCI compliance is effectively free — the gateway handles it. For businesses handling raw card data, PCI SAQ-D self-assessment costs a few hundred pounds annually. For large enterprises requiring Level 1 PCI compliance with on-site audits, costs range from £50,000 to £200,000+ per year.

Can I negotiate payment gateway fees?

Yes. Every major gateway offers custom pricing at volume. Start negotiations when you hit £50,000/month in processing volume. At £500,000+/month, you should expect interchange-plus with a markup below 0.1%. Always get competing quotes — this gives you leverage.

What are cross-border payment gateway fees?

Cross-border fees apply when the customer's card-issuing bank is in a different country to your acquiring bank. They typically add 0.5% to 1.5% on top of domestic rates, plus currency conversion fees of 1-2.5%. Using local acquiring (processing through an acquirer in the customer's country) eliminates these fees.

Related Reading

• What Is a Payment Gateway? — how gateways work, key features, and how to choose one

• Credit Card Processing Fees Explained — detailed breakdown of interchange, scheme fees, and processor markups

• Gateway vs Orchestrator vs PayFac vs Payment Layer — understanding the infrastructure options beyond a single gateway

• What Is Payment Orchestration? — how multi-PSP routing reduces costs and increases approval rates

• PSP-Neutral vs Single PSP — the case for gateway portability and avoiding lock-in

• Enterprise PSP Mandates — why large enterprises require multi-PSP and what it means for costs

Stop Overpaying for Payment Infrastructure

If you are a platform or SaaS company embedding payments, the gateway transaction fee is just one piece of the puzzle. The real cost is in the infrastructure that connects your platform to the payment ecosystem — and the lock-in that accumulates over time.

Shuttle Global is the payment layer for software platforms. We connect you to 40+ PSPs through a single integration, so you can route transactions to the best provider for each market, negotiate from a position of strength, and swap providers without re-engineering your checkout.

Talk to us about your payment infrastructure or explore our Voice Checkout and Payment Links products.