moklet

With the yahoo currency plugin you can display and embed Yahoo Currency Feeds in your WordPress posts and pages using the following shortcode:
<pre><code>[ycurrency base="Currency Code" currencies="Currency Code,Currency Code,Currency Code etc"]
</code></pre>
FILTER USAGE
<ul>
<li>Simple:</li>
</ul>
Just put a <code>[ycurrency base="Currency Code" xcur="Currency Code,Currency Code,Currency Code etc"]</code> in your post, and the rates will show up.
<ul>
<li>NAMED PARAMETERS</li>
</ul>
For some customisation there are some options you can use.
<ul>
<li>base : The Base Currency in international format (USD)</li>
<li>xcur : The other currencies you want to display the rate compared to the base currency seperated by a comma (GBP,EUR)</li>
</ul>
Examples:
<pre><code>[ycurrency base="USD" xcur="GBP,EUR,ZAR"] (display the buy and sell rate of the US Dollar against the British Pound,Euro,South African Rand)
</code></pre>
Finally note the whole thing must be on ONE line. No line breaks or else it won’t work.
1.00 Initial release.

Yahoo Currency

With the yahoo currency plugin you can display a feed of Yahoo Currency Exchange rates.

Palasthotel

greatestview

CAUTION: This plugin is now deprecated! The successor plugin is <a href="https://wordpress.org/plugins/embed-javascript-file-content/" rel="ugc">Embed JavaScript File Content</a>. The new plugin is rebuild from scratch and more rock solid: It respects order and position of scripts and extra scripts added via <code>wp_add_inline_script</code> or <code>wp_localize_script</code> don’t get lost. Give it a try!
In some cases you cannot wait for a JavaScript file to load, even if it is placed early in the <code><head></code> section of your template. You can benefit from better performance, if you place the JavaScript code directly inside a <code><script></code> tag into the header. This is where this plugin comes in: It provides a filter <code>inline_javascript_in_head_handles</code>, which takes JavaScript handles, dequeues those scripts and echos their code content inline into the head section instead of linking them via a script tag.
Please beware that placing lots of JavaScript code inline in the <code><head></code> section can be critical! First you lose caching benefits and second the document size can increase easily. A general rule of thumb is that you should only consider JavaScript files for inline placement, which are critical and which have a file size lower than ~500 Bytes.
<h4>Example</h4>
<pre><code>add_action( 'wp_enqueue_scripts', 'my_scripts' );
function my_scripts() {
 // Some critical script is enqueued
 wp_enqueue_script( 'js-detection', get_template_directory_uri() . '/js/js-detection.js' );
}

/**
 * Define JavaScript handles to be echoed inline in the html head section.
 */
add_filter( 'inline_javascript_in_head_handles', 'my_inline_javascript_in_head_handles', -20 );
function my_inline_javascript_in_head_handles( $handles ) {
 $scripts = [ 'js-detection' ];

 return array_merge( $handles, $scripts );
}
</code></pre>

Inline JavaScript in Head

Boosts performance of critical short JavaScripts by placing their content directly into the HTML head.

Yahoo Currency vs Inline JavaScript in Head