Where can I find an CRC API example for the MAX32630/31/32?

The examples are downloaded using the ARMCortexToolchain installer.  You can easily choose to download only the product specific resources/firmware.  Once you finish the installation, look in the installation location you specified.  The folder named "Firmware" contains the SDK API and examples.  So for the MAX32630/31/32, the CRC example is located in <install dir>\Firmware\MAX3263X\Applications\EvKitExamples\CRC\.