How to use exchange rate from Currency Api in a field? I've installed Currency Api Module + Yahoo! Finance currency converter and  
made with "Currency Filter" a new field (using Markup module) in my content named "latest_exchange_rate" with the value of latest USD-EUR exchange rate coming from Yahoo!Finance;
in the same content, there is a decimal field named "usd_value" filled with a value during content creation;
additionally I created also a Computed field named "eur_value" which is a multiplication = "latest_exchange_rate * usd_value";


The problem is that the computed field seems not able to read the value of "latest_exchange_rate" field, and the result is always 0.00.

I am not a coder, can you please help me to solve this problem?
If my approach is not correct, how can I use an exchange value from Currency API to make conversions between different currencies?

Thank you in advance for attention, Francesco in Cina
Here is a much leaner version of your setup:

In order to get your node to always display the current converted usd_value to EUROs, you will need only one computed field (no markup field required). 
You just will need to place the following in the "Display Code (PHP)" textarea:

$conversion_factor = CurrencyYahooFinanceCurrencyExchanger::load('USD','EUR');
$node_usd_value = $entity-&gt;field_usd_value[LANGUAGE_NONE][0]['value'];
$euro_value_live = $conversion_factor * $node_usd_value;
$display_output = number_format($euro_value_live,2);


That should be all, just tried it and I am getting the following to display. My computed field is called "EUR Value (Live)":



Hope this does the trick for you!