Circle APIs Documentation

Learn how to integrate with Circle APIs to accept traditional and USDC payments, automate payouts, embed digital dollar accounts into your product or service, or power your internet marketplace.

Test Card Numbers

You can use the Circle API sandbox environment to exercise various types of card payment behaviors, such as authorization failure codes and address verification results.

Test Card Numbers


No Real Charges

The sandbox environment will authorize card payments made with any card number, but it will never actually verify or charge the card.

To simulate different card payments conditions and the corresponding responses, please use one of the provided test card numbers below.

Card numberCard provider

Response Codes

To trigger specific response codes, use the corresponding amounts below when creating a payment. Any amount not specified in the table will return Approved (response code 00).

AmountResponse codeDescription
5.01payment_failedPayment failed due to unspecified error
5.04card_not_honoredContact card issuer to query why payment failed
5.05payment_not_supported_by_issuerIssuer did not support the payment
5.07payment_not_fundedInsufficient funds in account to fund payment
5.19card_invalidInvalid card number
5.41card_limit_violatedExceeded amount or frequency limits
5.43payment_deniedPayment denied by Circle Risk Service or card processor risk controls
5.51payment_fraud_detectedPayment suspected of being associated with fraud
5.54credit_card_not_allowedIssuer did not support using a credit card for payment
5.57payment_stopped_by_issuerA stop has been placed on the payment or card
5.84card_account_ineligibleIneligible account associated with card

CVV Verification

For more information on the card verification value (CVV) check and return values see the verifying card details guide.

Setting the CVV to 000 or 999 will cause a CVV failure response.

AVS Verification

For more information on the address verification service (AVS) check and the possible return codes see verifying card details guide.

To trigger a particular AVS check result, set the address line 1 field to Test_X, where X is one of the available AVS return codes. The result defaults to AVS code Y otherwise.

Updated 2 months ago

Test Card Numbers

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