You can use our rates.
Current version: https://www.alfa.cash/api/rates
Current version: https://www.alfa.cash/api/rates/txt
Only short names and gateway codes are available, please change URL to Current version
Short payment gateway names: https://www.alfa.cash/exchange/export/rates/txt/short
Payment Gateway IDs: https://www.alfa.cash/exchange/export/rates/txt/long
If there is any inaccuracy in our export rate file, please consider creating a ticket for that issue.