diff --git a/MEV_by_chains/MEV_on_Ethereum/relays.md b/MEV_by_chains/MEV_on_Ethereum/relays.md
index 65c2f50..c5b7a2e 100644
--- a/MEV_by_chains/MEV_on_Ethereum/relays.md
+++ b/MEV_by_chains/MEV_on_Ethereum/relays.md
@@ -53,6 +53,7 @@
 * [SushiGuardRouterV01 (with Manifold relay)](https://snapshot.org/#/sushigov.eth/proposal/bafkreigjjhjx2j2b526d3poeg23w2xan4rcgnzvcxinsssv7n37lu5p7s4)
 * [relayscan.io](https://www.relayscan.io/)
 * [malicious validator $20 from mev bots](https://eigenphi.substack.com/p/how-did-a-malicious-validator-steal)
+* [optimistic relays, by frontier.tech](https://frontier.tech/optimistic-relays-and-where-to-find-them)
 
 
 <br>