QF and Retro Funding Changing the Rules of Web3 Funding: Gitcoin, a public goods funding platform utilizing blockchain technology, recently started the 23rd Grant Round (GG23) with donations received until April 16, 2025, targeting funding for various projects active in the Web3 ecosystem. Quadratic Funding (QF) explained: QF distributes matching funds based not on total donation amount but on the number of unique contributors -- a project with 100 contributors giving 1 dollar each receives more matching funds than a project with one contributor giving 100 dollars; this mechanism amplifies community preference signals over wealthy donor preferences, making the funding distribution more democratic. Retroactive Public Goods Funding (RPGF): pioneered by Optimism, RPGF rewards projects for value already created rather than promising future value; this inverts the typical funding model (promise first, deliver later) to reward proven contribution; the Ethereum ecosystem has distributed hundreds of millions in RPGF, creating a sustainable funding mechanism for open source infrastructure. The significance: QF and RPGF represent genuinely new funding mechanisms that Web3 enables -- impossible without programmable money and transparent on-chain identity; they address the public goods problem (valuable things that cannot be monetized through markets) with market-like mechanisms that preserve community agency.