Thanks for the suggestion. Welcome to the community. 
It would be great if you could take a moment to Introduce yourself here!
I haven’t done any cross chain swaps, so am new to how this works, I have only used bridges between Ethereum networks as a user e.g. https://github.com/poanetwork/token-bridge
What do you need HTLC for (I assume at Kaleido)?
What examples are there of HTLC being used already on Ethereum?
In your opinion what are the pros and cons of HTLC compared with other techniques for cross chain swaps? Is there any reading suggestions?