Hi Luc,
"The exchange was at capacity" means that the coin Exchange support team told me that I was receiving the error message preventing me from trading because "they were at capacity". Seems odd to me too. I was not using the Coinigy API at the time. I was trading directly with my coin Exchange (ie. HitBC, Bittrex, Kraken,etc).
Can't thank you enough for making these videos. Clear, concise, and you have some great stories as well. Thanks again.