Open Exchange Rates
The Open Exchange Rates integration will show you the current exchange rate from Open Exchange Rates that provides real-time exchange rates for 170 currencies. The free account is limited to only USD as a base currency, allows 1000 requests per month, and updates every hour.
Obtain your API key here
Configuration
Adding Open Exchange Rates to your Home Assistant instance can be done via the user interface, by using this My button:
If the above My button doesn’t work, you can also perform the following steps manually:
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Browse to your Home Assistant instance.
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In the bottom right corner, select the Add Integration button.
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From the list, select Open Exchange Rates.
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Follow the instructions on screen to complete the setup.