> For the complete documentation index, see [llms.txt](https://support.gitcoin.co/gitcoin-knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.gitcoin.co/gitcoin-knowledge-base/~/revisions/9mvTx8ytHXLD56iyJuxb/gitcoin-grants-program/mechanisms/retroactive-funding.md).

# Retroactive Funding

> The core principle behind the concept of retroactive public goods funding is simple: **it’s easier to agree on what *****was***** useful than what *****will be***** useful**. - [Vitalik Buterin](https://medium.com/ethereum-optimism/retroactive-public-goods-funding-33c9b7d00f0c)

Differing from other mechanisms, retroactive funding is based on *past* performance. This can be a great way to support builders in a community that have made already useful contributions.

Gitcoin supports [easyretropgf.xyz](https://easyretropgf.xyz/), the lowest-barrier tool for Retro rounds.\
[EasyRetroPFG Docs](https://docs.easyretropgf.xyz/) are a great resource for more information.