There are very few text link ad networks in 2018 as google/cia has closed down most of the ad networks to increase its google adwords profit
Some of the major text link networks are
Backlinks.com
Magenet

Sape.ru is not approving many websites, so is there any other ad network for selling advertising like tnx.net which was shut down.Information on Banner ad networks which will pay a fixed fee monthly will also be appreciated