# Exchanges fail with the Exchange Rate error: the rate for this pair cannot be found, please try another pair

## Problem

A client encounters the following error when attempting to exchange one currency for another in the B2CORE UI: `Exchange Rate error: the rate for this pair cannot be found, please try another pair`.

## Possible reasons

This issue may occurs due to one or more of the following:

* One or both currencies aren't added in the B2CORE Back Office.
* The selected currency pair isn't configured or is disabled in the B2CORE Back Office.
* The exchange rate provider configuration is incomplete or incorrect.

### Solution

To fix the exchange issue:

{% stepper %}
{% step %}

#### Verify that currencies exist in the B2CORE Back Office

* Navigate to **Currencies** > **Currencies**.
* Ensure that both currencies involved in the exchange are added. If not, add the missing currencies (for details, refer to [How to add a currency](https://docs.b2core.b2broker.com/how-to-articles/manage-currencies/how-to-add-a-currency)).
  {% endstep %}

{% step %}

#### Verify that the currency pair is configured in the B2CORE Back Office

* Navigate to **Currencies** > **Currency pairs**.
* Confirm that the required currency pair is configured and enabled. If not, add or enable it (for details, refer to [How to add an exchange currency pair](https://docs.b2core.b2broker.com/how-to-articles/manage-currencies/how-to-add-an-exchange-currency-pair)).
  {% endstep %}

{% step %}

#### Check that the exchange rate provider is properly configured in the B2CORE Back Office

* Navigate to **Currencies** > **Rates**.
* Locate the provider used to supply rates for the required currency pair, for example B2BINPAY, and click the **Edit** button to open its details.
* Verify its configuration and credentials (for details, refer to [How to configure currency exchange rates](https://docs.b2core.b2broker.com/how-to-articles/manage-currencies/how-to-configure-currency-exchange-rates)).
  {% endstep %}
  {% endstepper %}

After confirming that currencies, currency pairs, and provider settings are correctly configured, the exchange should work without errors.