You haven’t said which pair to support. Cryptsy has fiat so you could support NBT/USD and/or NBT/BTC. They have greatly different risks. With NBT/USD the pool only faces exchange default risk, which I think is small for Cryptsy.
Nu only has one exchange offering NBT/USD peg, so I strongly suggest you support this pair. To enable USD account one has to go extra KYC/AML steps on Cryptsy, however. That justifies part of the pool reward to liquidity providers.
NBT/BTC is perhaps what you are having in mind. You can get a draft custodial vote going and invite comments while the dev team work on the bot.