diff --git a/.changeset/breezy-balloons-ring.md b/.changeset/breezy-balloons-ring.md
new file mode 100644
index 00000000000..68e703501c4
--- /dev/null
+++ b/.changeset/breezy-balloons-ring.md
@@ -0,0 +1,5 @@
+---
+"@thirdweb-dev/service-utils": patch
+---
+
+[service-utils] Helper to call client usageV2 reporting endpoint
diff --git a/packages/service-utils/src/cf-worker/usageV2.ts b/packages/service-utils/src/cf-worker/usageV2.ts
index b9fcbd0ec37..74baec5be29 100644
--- a/packages/service-utils/src/cf-worker/usageV2.ts
+++ b/packages/service-utils/src/cf-worker/usageV2.ts
@@ -1,47 +1,51 @@
 import type { UsageV2Event, UsageV2Source } from "../core/usageV2.js";
 
+type UsageV2Options = {
+  environment: "development" | "production";
+  source: UsageV2Source;
+} & (
+  | { serviceKey: string; thirdwebClientId?: never; thirdwebSecretKey?: never }
+  | { serviceKey?: never; thirdwebClientId: string; thirdwebSecretKey?: never }
+  | { serviceKey?: never; thirdwebClientId?: never; thirdwebSecretKey: string }
+);
+
 /**
- * Send events to Kafka.
- * This method may throw. To call this non-blocking:
+ * Send usageV2 events from either internal services or public clients.
+ *
+ * Exactly one authentication method must be provided:
+ * - serviceKey: for internal services
+ * - thirdwebClientId: for public clients (MUST be the user's project)
+ * - thirdwebSecretKey: for public clients (MUST be the user's project)
  *
+ * This method may throw. To call this non-blocking:
  * ```ts
- * void sendUsageV2Events(events, {
- *   environment: "production",
- *   serviceKey: "..."
- * }).catch(console.error)
+ * void sendUsageV2Events(...).catch((e) => console.error(e))
  * ```
- *
- * @param events - The events to send.
- * @param options.environment - The environment the service is running in.
- * @param options.serviceKey - The service key required for authentication.
  */
 export async function sendUsageV2Events(
   events: UsageV2Event[],
-  options: {
-    environment: "development" | "production";
-    source: UsageV2Source;
-    serviceKey?: string;
-  },
+  options: UsageV2Options,
 ): Promise<void> {
   const baseUrl =
     options.environment === "production"
       ? "https://u.thirdweb.com"
       : "https://u.thirdweb-dev.com";
 
-  // Unauthed calls are routed to the /client path
+  // Determine endpoint and auth header based on provided credentials.
   let url: string;
-  let headers: HeadersInit;
+  const headers: HeadersInit = { "Content-Type": "application/json" };
+
   if (options.serviceKey) {
     url = `${baseUrl}/usage-v2/${options.source}`;
-    headers = {
-      "Content-Type": "application/json",
-      "x-service-api-key": options.serviceKey,
-    };
-  } else {
+    headers["x-service-api-key"] = options.serviceKey;
+  } else if (options.thirdwebSecretKey) {
     url = `${baseUrl}/usage-v2/${options.source}/client`;
-    headers = {
-      "Content-Type": "application/json",
-    };
+    headers["x-secret-key"] = options.thirdwebSecretKey;
+  } else if (options.thirdwebClientId) {
+    url = `${baseUrl}/usage-v2/${options.source}/client`;
+    headers["x-client-id"] = options.thirdwebClientId;
+  } else {
+    throw new Error("[UsageV2] No authentication method provided.");
   }
 
   const resp = await fetch(url, {
@@ -52,7 +56,7 @@ export async function sendUsageV2Events(
 
   if (!resp.ok) {
     throw new Error(
-      `[UsageV2] unexpected response ${resp.status}: ${await resp.text()}`,
+      `[UsageV2] Unexpected response ${resp.status}: ${await resp.text()}`,
     );
   }
   resp.body?.cancel();