# Retro Funding 5: OP Stack sign up is open!

Source: https://x.com/Optimism/status/1827002745456382147
Kiwi News: https://news.kiwistand.com/stories/Retro-Funding-5-OP-Stack-sign-up-is-open?index=0x66c8afb5b7365eabaadf79e3e9562c0061142c18f87c8424eaf1cdc278bc98a6812a4f1b
Submitted by tim on 2024-08-23 UTC, 3 upvotes, 0 comments

🔴Retro Funding 5: OP Stack sign up is open! 🔴

8M OP for contributors to:

Ethereum Core Development
OP Stack Research & Development
OP Stack Tooling

Sign up 👉 http://retrofunding.optimism.io