# Builders: Applications Open Until June 6th for 10m OP in Retro Funding!

By [Optimism Collective](https://paragraph.com/@optimismcollective) · 2024-05-23

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Retro Funding 4 is rewarding onchain builders who have deployed contracts that generated demand for blockspace across eligible Superchain networks for this round (OP Mainnet, Base, Zora, Mode, Frax and Metal).  
  
**Apply here:** 

[retrofunding.optimism.io](http://retrofunding.optimism.io)  

**Timing:** 

Open until June 6th 19:00 UTC via [retrofunding.optimism.io](http://retrofunding.optimism.io) 

**Eligibilities:**

*   Deployed their onchain contracts on one or multiple of the following OP chains: OP Mainnet, Base, Zora, Mode, Frax and Metal, and meet the following criteria:
    
    *   Onchain contracts have interactions from 420 unique addresses during Jan 1st - May 1st 2024
        
    *   Onchain contracts had their first transaction before April 1st 2024
        
    *   Onchain contract had more than 10 days of activity during Jan 1st - May 1st 2024
        
*   Verified their onchain contracts in the Retro Funding sign-up process
    
*   Made their contract code available in a public Github repo, for which ownership has been verified in the Retro Funding sign-up process
    
*   Confirmed that they will comply with Optimism Foundation KYC requirements and are not residing in a sanctioned country
    
*   Submitted a Retro Funding application before June 6th, 2024 and comply with application rules
    

**Bonus for early birds:** 

For those who apply before 14:00 UTC, May 31, you'll be added to an allowlist to mint a little surprise by secretpikachu.eth via ZORA.

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*Originally published on [Optimism Collective](https://paragraph.com/@optimismcollective/retro-funding-4-open)*