user12834: Where can I find information on a large number of "exchange" or "trading platform" APIs showing which currencies (digital and fiat) they convert between?

user13229: Each site has its own set of apis and documentation, I don't think it's likely that you'll find a single site with a complete set of APIs.
Here are some links to get you started:

coinbase.com/api/doc


user5406: Since you originally stated that you wanted to write a trading bot, perhaps you will find the following library useful: 
"XChange is a Java library providing a simple and consistent API for interacting with over a dozen Bitcoin exchanges providing a consistent interface for trading and accessing market data" (according to their GitHub page)
Unfortunately, I cannot tell you more about it, as I just stumbled upon it by accident.

12834: <p>Where can I find information on a large number of "exchange" or "trading platform" APIs showing which currencies (digital and fiat) they convert between?</p>
 13229: <p>Each site has its own set of apis and documentation, I don't think it's likely that you'll find a single site with a complete set of APIs.</p>

<p>Here are some links to get you started:</p>

<ul>
<li>coinbase.com/api/doc</li>
</ul>
 5406: <p>Since you originally stated that you wanted to write a trading bot, perhaps you will find the following library useful: </p>

<p>"<a href="https://github.com/timmolter/XChange" rel="noreferrer"><strong>XChange</strong></a> is a Java library providing a simple and consistent API for interacting with over a dozen Bitcoin exchanges providing a consistent interface for trading and accessing market data" (according to their <a href="https://github.com/timmolter/XChange" rel="noreferrer">GitHub page</a>)</p>

<p>Unfortunately, I cannot tell you more about it, as I just stumbled upon it by accident.</p>
