Every deck on Speaker Deck has the oEmbed endpoint as a link tag in the header so it can be automatically detected by sites like Embed.ly.
For more documentation on oEmbed please see oembed.com. Our oEmbed endpoint is: https://speakerdeck.com/oembed.json so requesting an oEmbed would look like this: https://speakerdeck.com/oembed.json?url=URL_OF_THE_DECK
Here is a fully functioning example:
https://speakerdeck.com/oembed.json?url=https://speakerdeck.com/jnunemaker/atom