Here's the info page. Looks like no horsepussy, and they have the right to reject whatever they don't see fit so there's a chance they won't allow us, but I don't think Hiro really gives a shit as long as we're paying customers.
Here's the wall of text:
"Creatives must be of acceptable quality, and "work safe."
No ads inciting harassment or containing personal information will be accepted.
No ads that are harmful or malicious in nature will be accepted. This includes landing pages with pop-ups, pop-unders, redirects, dialog box loops, malware, etc.
You may not advertise products or services that violate United States or local law.
Landing pages must match ad content (i.e. no "bait & switch" advertising).
No creatives imitating video players, close or cancel buttons, download buttons, browser/system/anti-virus alerts, etc.
Ads cannot purport to be "official" 4chan ads.
We only accept banner ads in JPG, PNG, and GIF formats. We reserve the right to reject animated GIFs that are annoying, distracting, or otherwise objectionable.
Purchasing any advertisement on 4chan does not exempt you from our strict "No Advertising" rule while posting on 4chan. You are purchasing a banner ad only, and not the ability to advertise your product/site/etc in regular posts.
4chan reserves the right to reject any and all advertising at its sole discretion.
We will not accept ads for the following products or services:
Controlled substances or paraphernalia
Alcohol, tobacco, tobacco products, or prescription drugs
Affiliate marketing (referrals, direct marketing, etc)
Firearms, ammunition, or weapons
Pirated software or hacking/cracking tools
Discriminatory content, including content that promotes discrimination by race, ethnicity, nationality, religion, disability, gender, age, or sexual orientation"
If you're going to make an ad to throw in the ring, remember that it has to be either 728x90 (for desktop) or 300x250 (not recommended as this is used for mobile only).