diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..9b229f3
--- /dev/null
+++ b/.env.example
@@ -0,0 +1 @@
+OPENROUTER_API_KEY=
diff --git a/src/config.ts b/src/config.ts
new file mode 100644
index 0000000..5f49a4b
--- /dev/null
+++ b/src/config.ts
@@ -0,0 +1,12 @@
+import "dotenv/config";
+
+export interface Config {
+  openrouterApiKey: string;
+}
+
+const openrouterApiKey = process.env["OPENROUTER_API_KEY"];
+if (!openrouterApiKey) throw new Error("OPENROUTER_API_KEY is missing");
+
+export const config: Config = {
+  openrouterApiKey: openrouterApiKey,
+};