diff --git a/.changeset/thirty-geckos-study.md b/.changeset/thirty-geckos-study.md
new file mode 100644
index 0000000..fcebd43
--- /dev/null
+++ b/.changeset/thirty-geckos-study.md
@@ -0,0 +1,5 @@
+---
+"@farcaster/auth-relay": patch
+---
+
+chore: add RPC URL env var
diff --git a/apps/relay/src/env.ts b/apps/relay/src/env.ts
index 7210327..009e197 100644
--- a/apps/relay/src/env.ts
+++ b/apps/relay/src/env.ts
@@ -18,6 +18,7 @@ export const URL_BASE =
 export const HUB_URL = process.env["HUB_URL"] || "https://nemes.farcaster.xyz:2281";
 export const HUB_FALLBACK_URL = process.env["HUB_FALLBACK_URL"] || "https://hoyt.farcaster.xyz:2281";
 
-export const OPTIMISM_RPC_URL = process.env["OPTIMISM_RPC_URL"] || "https://mainnet.optimism.io";
+export const OPTIMISM_RPC_URL =
+  process.env["OPTIMISM_RPC_URL"] || process.env["OP_MAINNET_RPC_URL"] || "https://mainnet.optimism.io";
 
 export const AUTH_KEY = process.env["AUTH_KEY"];