The FX exchange rate endpoint returns the amount the end-user should receive in their local currency. For example, if your account is in Indian Rupees ( INR ) and you are making a top-up to a number registered to Natcom Haiti, the fxRate returned will be 1.16 ( 1 INR = 1.16 HTG )
To make use of this endpoint, you would have obtained and passed your access token in your request header.
The sample below is done using postman and you can replicate this using any programming language of your choice. You can find detailed documentation and sample code snippets for different languages here
Here's a screenshot of where to pull the delivery amount which is returned in the "fxRate" field in the API response.