If your deposit or crypto purchase with a card didn't go through, it is usually due to a temporary connection glitch or a specific bank setting. Most of these issues can be resolved in under a minute.
Quick Fixes to Try First
Before diving into the detailed settings below, try these two steps:
Retry the transaction: Small connection timeouts can cause a one-time failure. Often, a second attempt works perfectly.
Switch platforms: If you used the CEX.IO website, try the mobile app (or vice versa). Sometimes, different interfaces can bypass browser-specific glitches.
Use an alternative method: If one card is being stubborn, try using a card from another bank. For a more consistent deposit experience, you may try a debit card, as they statistically see 25% fewer declines than other methods.
Also, you can use one of the following payment methods:
Google Pay, Apple Pay
Bank Transfer (SEPA (EEA), ACH (US), Domestic wire (US))
Open Banking (UK)
MoneyGram
Below, we have covered the most common decline reasons and step-by-step solutions for each one. You can jump to the section with a solution to your specific issue by using the table of contents.
Incorrect 3DS code (3D Secure authentication unavailable)
Why this happens
Modern card payments use 3D Secure (3DS) authentication, which sends a one-time password (OTP) to your phone or email to verify the transaction. Two common issues can block this process:
A VPN may route your traffic through a different country, causing your bank’s fraud system to flag the transaction or prevent OTP delivery.
Ad blockers can block cookies or pop-ups required for the 3DS verification window to load properly.
How to fix
Disconnect from any VPN or proxy service.
Clear browser cache and cookies
Switch to an incognito/private browser window.
Make sure pop-ups are allowed (check your browser settings).
Check that your phone has a signal or internet access so the OTP SMS can be received.
Retry the deposit.
Insufficient balance or Card limits exceeded
Why this happens
Your account balance is lower than the deposit amount (including any bank fees).
You have reached your card’s daily or monthly spending limit.
Your bank has a per-transaction limit that’s lower than the amount you’re trying to deposit.
How to fix
Check your available balance in your banking app.
Review your current daily and monthly spending limits.
If limits are too low, contact your bank to request a temporary increase, or try a smaller deposit amount.
Incorrect card details
Why this happens
A single typo in your card number, expiry date, or CVV will cause an immediate decline. This is one of the most common — and simplest to fix — causes of failed payments.
How to fix
Open your CEX.IO App and go to Payment methods in your Profile menu. If you’re using the CEX.IO website, open the Wallet page and choose the Account Manager tab.
Choose Visa/Mastercard and delete the card you think has incorrect details.
Request the deposit again and double-check the 16-digit card number.
Verify the expiry date (MM/YY format).
Check the CVV (3 digits on the back for Visa/Mastercard).
Confirm the billing address matches what your bank has on file (if required).
Expired or Blocked Card
Why this happens
If your card has passed its expiry date, or your bank has blocked it due to suspicious activity, all transactions will be declined regardless of balance.
How to fix
Check the expiry date printed on your card. If it has passed, contact your bank to issue a replacement.
If your card was recently blocked or flagged, call your bank to find out the reason.
Once you have a new or unblocked card, use it as a new payment method and retry the deposit.
Declined by your card-issuing bank
Why this happens
Based on our experience, most declined card payments come down to general card settings and bank requirements rather than an issue on the CEX.IO side.
Your bank may block the transaction if specific permissions are not enabled on your card, or if your bank forbids crypto-related payments.
Before using your card, check that:
Internet payments are ON, and/or P2P operations are allowed on your card.
Your card has sufficient limits for online payments.
Your card-issuing bank allows quasi-cash or cash advance transactions.
If any of the above are disabled or restricted, your payment will be declined even if your card is active and your balance is sufficient.
How to fix it
Open your bank’s mobile app or online banking portal.
Navigate to Card Settings or Security Settings.
Enable both International transactions and Online/e-commerce payments.
Retry your deposit on CEX.IO.
Note: If you can’t find these settings in the app, call the number on the back of your card and ask your bank to enable international and online transactions.
We know that payment declines are frustrating. To support our community, CEX.IO occasionally issues limited-time promotional offers to users who have encountered transaction issues. If you received a notification regarding a special promotional offer, you can read the Official Promotion Rules here.
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