Optimism has opened its fourth round of retroactive financing applications, named Onchain Builders. This round of financing will allocate 10 million OP tokens to builders who deploy contracts on OP Stack (including Base, Mode, Redstone, and Zora) chains. The submission window is open until 19:00 UTC on June 6th, but applicants who submit before May 31st will receive a commemorative NFT.

To qualify, smart contracts must have interacted with at least 420 unique addresses between January 1st and May 1st, 2024, have been active for at least 10 days, and have verified contract ownership on GitHub. Badge holders will vote on submitted works next month, and winners will be announced on July 15th.