UK Bank Account Validation Services | Modulus Check & Confirmation of Payee

What is Bank Account Validation?

Bank account validation ensures that payment details are accurate and belong to the intended recipient. In the UK, there are two complementary approaches to validating bank accounts, each serving a different purpose in your payment security and fraud prevention strategy.

Why validation matters: Payment fraud costs UK businesses millions annually. The Payment Systems Regulator (PSR) now requires CoP for many payment types. Proper account validation reduces fraud, prevents misdirected payments, and ensures regulatory compliance.

Two Levels of Validation

Modulus Checking

Technical validation of account structure

Validates sort code & account number
Mathematical algorithm verification
Catches typos & format errors
Does NOT verify account holder name
Price: from 1.5p per check

Confirmation of Payee (CoP)

Name verification against account holder

Validates sort code & account number
Verifies account holder name match
Prevents fraud & misdirected payments
PSR regulatory compliance
Price: from 15p per check

The Key Difference

Modulus Checking confirms "Is this a valid account?"
Confirmation of Payee confirms "Is this the RIGHT person's account?"

TECHNICAL VALIDATION

Modulus Checking

Modulus checking uses sophisticated mathematical algorithms defined by VocaLink (a Mastercard company) to verify that a UK sort code and account number combination is structurally valid.

What It Does

Validates the sort code exists in the UK banking system
Applies modulus 10 or modulus 11 algorithms to the account number
Detects common data entry errors like transposed digits
Identifies accounts that don't accept electronic payments
Returns bank and branch details for valid accounts

Best Use Cases

Real-time validation during account detail entry
Batch validation of existing customer databases
Pre-submission checks in payment forms
High-volume, low-value transaction processing
First-line defence against data entry errors

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What It Doesn't Do

Does not verify who owns the account
Does not check if the account name matches
Does not confirm account is open or active
Does not prevent fraud from valid but wrong accounts

2.5p

per check

Real-time API responses
<50ms response time
100% availability SLA*
Volume discounts available
No monthly minimum

Try Free Demo Learn More

Example API Response

{
  "sortcode": "404784",
  "accountNumber": "00110022",
  "result": "Valid",
  "bank": "HSBC UK BANK PLC",
  "branch": "Leeds City",
  "acceptsPayments": true,
  "supportsBACS": true,
  "supportsFasterPayments": true
}

95%+

of UK accounts validated successfully

NAME VERIFICATION

Confirmation of Payee (CoP)

Confirmation of Payee is a name-checking service mandated by the Payment Systems Regulator (PSR) that verifies the name you provide matches the actual account holder's name on file with their bank.

What It Does

Validates sort code and account number (includes modulus check)
Matches the payee name against the actual account holder
Returns MATCH, CLOSE_MATCH, or NO_MATCH results
Provides the actual account holder name for close matches
Prevents Authorised Push Payment (APP) fraud
Ensures PSR regulatory compliance

Best Use Cases

New payee setup – verify recipients before first payment
High-value transactions – extra security for large payments
Business payments – prevent invoice fraud and redirection scams
Consumer protection – reduce misdirected payment complaints
Regulatory compliance – meet PSR APP fraud requirements

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Match Results Explained

MATCH

Name matches exactly – safe to proceed

CLOSE_MATCH

Name is similar (e.g., "Selena Gome" vs "Selena Gomez") – confirm with user

NO_MATCH

Name doesn't match – potential fraud or error

15p

per check

Real-time name verification
<50ms response time
100% availability SLA*
PSR compliant
5 free credits for new signups

Try Free CoP Demo Learn More

Example CoP Response

{
  "sortcode": "404784",
  "accountNumber": "00110022",
  "name": "Selena Gomez",
  "copResult": "MATCH",
  "description": "The name matches",
  "advice": "Proceed with payment",
  "accountType": "PERSONAL"
}

PSR COMPLIANT

Meets Payment Systems Regulator requirements for APP fraud prevention

Decision Guide: Which Service Should You Use?

Form Validation & Data Entry

You want to catch typos and errors as users enter bank details into your forms.

✓ Use Modulus Checking

Low cost, instant validation, perfect for real-time feedback during data entry.

New Payee / First-Time Payment

A customer is adding a new payee or making a payment to someone for the first time.

✓ Use Confirmation of Payee

Verify the account holder name matches to prevent fraud and misdirected payments.

High-Value Transactions

You're processing large payments where the cost of an error would be significant.

✓ Use Confirmation of Payee

The from 15p cost is negligible compared to the risk of a £10,000+ misdirected payment.

Two-Tier Approach (Recommended)

You want cost-effective validation with fraud prevention for high-risk payments.

✓ Use Both Services

Step 1: Modulus Check on all entries (from 1.5p) to catch basic errors.
Step 2: CoP verification (from 15p) only on flagged or high-risk payments.

Bulk Database Validation

You need to validate thousands of existing customer bank accounts in your database.

✓ Use Modulus Checking

Cost-effective for large volumes, quickly identifies invalid accounts that need updating.

Ready to Validate UK Bank Accounts?

Try our free online demos to see both services in action. No registration required.

Modulus Checking Demo

Test account structure validation with real-time results

Try Demo

Confirmation of Payee Demo

Experience name verification with match results

Try CoP Demo

Ready to integrate? Sign up and receive 5 free credits to test against our live environment.

Sign Up for 5 Free Credits

Frequently Asked Questions

Modulus Checking validates the technical accuracy of a sort code and account number combination using mathematical algorithms. It confirms the account structure is valid but doesn't verify who owns the account.

Confirmation of Payee (CoP) goes further by checking that the name you provide matches the actual account holder's name on file with their bank. Use Modulus Checking for basic validation; use CoP when you need to verify the recipient's identity.

Use Modulus Checking (2.5p) for: validating account details during data entry, checking account format before storing in your system, reducing typos and basic errors, high-volume low-risk transactions.

Use Confirmation of Payee (15p) for: new payee setup, high-value payments, first-time payments to unfamiliar recipients, fraud prevention in payment workflows, compliance with PSR APP fraud regulations.

Yes! Many customers use a two-tier approach: First run Modulus Checking to validate account structure and catch basic errors (low cost), then run Confirmation of Payee for name verification on flagged or high-risk payments. This optimizes both cost and fraud prevention.

The Payment Systems Regulator (PSR) mandates that payment service providers implement CoP for certain payment types, particularly to combat Authorised Push Payment (APP) fraud. While requirements vary by business type, implementing CoP demonstrates due diligence and significantly reduces fraud liability.

A CLOSE_MATCH means the name is similar but not identical (e.g., "Selena Gome" vs "Selena Gomez"). Our API returns the actual account holder name so you can present it to your user for confirmation. This helps catch typos while still allowing legitimate payments to proceed with user approval.

Both services deliver real-time responses in under 50ms on average, making them suitable for synchronous validation in web forms, mobile apps, and payment workflows without impacting user experience.

Yes, we offer tiered pricing for high-volume customers. Contact our sales team to discuss enterprise pricing, SLA options, and dedicated support packages tailored to your validation needs.

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