Snapchat was once the leader in this sector until Facebook's muscle came in with Instagram to copy everything Snapchat did.
Now, Snapchat is on the road to catchup with it's own self-publishing ad tool, called Snap Publisher Tool.
...announcing the Snap Publisher tool for building vertical video creative, it’s rolling out its self-serve Ad Manager, and its launching a Snapchat Certified Partners program to connect advertisers to trained third-party ad tech tool providers. Snapchat Now Offers Self-Serve Advertising With Snap Publisher Tool [techcrunch.com]