diff --git a/apps/namadillo/package.json b/apps/namadillo/package.json
index a8601cc29..419fa277c 100644
--- a/apps/namadillo/package.json
+++ b/apps/namadillo/package.json
@@ -43,10 +43,11 @@
     "release:dry-run": "release-it --verbose --dry-run --ci",
     "release:no-npm": "release-it --verbose --no-npm.publish --ci",
     "start:proxy": "node ./scripts/startProxies.js",
-    "dev": "tsc --watch --project tsconfig.sw.json& vite",
+    "dev": "yarn dev:sw& vite",
+    "dev:sw": "tsc --watch --project tsconfig.sw.json",
     "preview": "vite preview",
     "dev:local": "NODE_ENV=development NAMADA_INTERFACE_LOCAL=\"true\" yarn dev",
-    "dev:proxy": "NAMADA_INTERFACE_PROXY=true && ./scripts/start-proxies.sh && yarn dev:local",
+    "dev:proxy": "NAMADA_INTERFACE_PROXY=true && ./scripts/start-proxies.sh && yarn dev",
     "build": "NODE_ENV=production && yarn wasm:build && vite build",
     "build:only": "NODE_ENV=production &&  vite build",
     "lint": "eslint src --ext .ts,.tsx",
diff --git a/apps/namadillo/src/index.tsx b/apps/namadillo/src/index.tsx
index fe79096eb..74f48cb26 100644
--- a/apps/namadillo/src/index.tsx
+++ b/apps/namadillo/src/index.tsx
@@ -56,9 +56,38 @@ if ("serviceWorker" in navigator) {
       })
       .then((registration) => {
         console.log("Service Worker registered: ", registration);
+
+        const msgChannel = new MessageChannel();
+        registration.active?.postMessage(
+          {
+            type: "INIT_PORT",
+          },
+          [msgChannel.port2]
+        );
+
+        msgChannel.port1.onmessage = (event) => {
+          switch (event.type) {
+            case "namadillo:hasMaspParamsResponse":
+              console.warn(`${event.data.param}: ${event.data.hasMaspParam}`);
+              break;
+          }
+        };
+
+        registration.active?.postMessage({
+          type: "namadillo:hasMaspParams",
+          param: "masp-output.params",
+        });
+        registration.active?.postMessage({
+          type: "namadillo:hasMaspParams",
+          param: "masp-spend.params",
+        });
+        registration.active?.postMessage({
+          type: "namadillo:hasMaspParams",
+          param: "masp-convert.params",
+        });
       })
       .catch((error) => {
-        console.log("Service Worker registration failed: ", error);
+        console.warn("Service Worker registration failed: ", error);
       });
   });
 }
diff --git a/apps/namadillo/sw/sw.ts b/apps/namadillo/sw/sw.ts
index 54ac17e38..3d708d3d9 100644
--- a/apps/namadillo/sw/sw.ts
+++ b/apps/namadillo/sw/sw.ts
@@ -1,3 +1,4 @@
+/// <reference lib="webworker" />
 importScripts("constants.js");
 importScripts("crypto.js");
 importScripts("fetch.js");
@@ -27,14 +28,57 @@ const logSuccess = ({ param, bytes }: MaspParamBytes): void =>
 
 const logError = (e: any) => console.error(e);
 
+const params = [MaspParam.Output, MaspParam.Spend, MaspParam.Convert];
+
 (async () => {
-  [MaspParam.Output, MaspParam.Spend, MaspParam.Convert].map(async (param) => {
+  params.forEach(async (param) => {
     if (!(await store.get(param))) {
       await fetchMaspParam(param)
         .then(validateMaspParamBytes)
         .then(storeMaspParam)
         .then(logSuccess)
         .catch(logError);
+    } else {
+      console.log(`Found ${param}`);
     }
   });
 })();
+
+/**
+ * EVENT HANDLERS
+ */
+const EVENT_PREFIX = "namadillo";
+
+enum EventMessage {
+  FetchMaspParams = `${EVENT_PREFIX}:fetchMaspParams`,
+  HasMaspParams = `${EVENT_PREFIX}:hasMaspParams`,
+  HasMaspParamsResponse = `${EVENT_PREFIX}:hasMaspParamsResponse`,
+}
+
+// PORT
+let port: MessagePort;
+
+self.addEventListener("message", (event: MessageEvent) => {
+  console.log({ event });
+  if (event.data && event.data.type == "INIT_PORT") {
+    port = event.ports[0];
+  }
+  const { data } = event;
+
+  switch (data.type as EventMessage) {
+    case EventMessage.FetchMaspParams:
+      console.log(`${EventMessage.FetchMaspParams}`);
+      break;
+    case EventMessage.HasMaspParams: {
+      const { param } = data;
+      store.get(param).then((record) => {
+        port.postMessage({
+          type: EventMessage.HasMaspParamsResponse,
+          param,
+          hasMaspParam: record ? true : false,
+        });
+      });
+      break;
+    }
+  }
+});
diff --git a/apps/namadillo/tsconfig.sw.json b/apps/namadillo/tsconfig.sw.json
index ae9435c8f..70e12e9c2 100644
--- a/apps/namadillo/tsconfig.sw.json
+++ b/apps/namadillo/tsconfig.sw.json
@@ -2,11 +2,11 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "baseUrl": "./sw",
-    "lib": ["ESNext", "WebWorker"],
+    "lib": ["esnext", "webworker"],
     "noEmit": false,
     "strict": false,
     "outDir": "public/sw",
-    "target": "ESNext",
+    "target": "esnext",
     "isolatedModules": false
   },
   "include": ["sw"]