Here is the lowest cap masternode network that I know of.

Flaxscript.

https://github.com/thegreatoldone/flaxscript

Here is the Block Explorer:

https://chainz.cryptoid.info/flax/

as you can see, it has 7 masternodes and a marketcap of $15,000 USD

15 connections and it still has active pools mining FLAX.

right now there is 5,472,849 FLAX in existence and the network mints about 1000 FLAX per day.

You need 23,000 FLAX for a masternode which is 0.029 BTC, pretty cheap compared to other masternodes.

Funny thing is that if you used 100% of all the coins and converted them into masternodes, you only get about 237 masternodes.

Here is the exchange it trades on:

https://www.cryptopia.co.nz/Exchange/?market=FLAX_BTC#

full disclosure, I own enough FLAX for 1 masternode. bought it just for fun, you never know with altcoins this one might just trade higher.