General
What is Billboard?
Billboard is a decentralized protocl turns website advertisement spaces into NFTs and sells them through perpetual Harberger auctions—anyone may bid, and the winner can place advertisements and pays a running tax proportional to the winning price.
The green paper of Billboard can be found here.
What and why Harberger Tax ?
Harberger Tax, also known as partial common ownership, keeps an asset in a continuous auction. It makes asset prices transparent and aligned with real market value. It prevents long-term hoarding by allowing ownership to change at regular, short intervals, which maintains liquidity. The taxes collected create a steady revenue stream for the community hosting the asset.
Billboard applies this model to each NFT, restarting the auction every 14 days instead of relying on opaque advertising networks. Advertisers bid openly during each period, and the resulting tax feeds a quadratic-funding pool that multiplies reader donations and rewards creators.
What is Quadratic Funding ?
Quadratic Funding is a matching system that adds extra money to projects based on how many people donate, not how much a few donors give. Lots of small contributions trigger bigger matches than a handful of large ones, so community popularity guides where the funds go. Platforms like Gitcoin use it to support open-source and other public goods.