Enables UI fee

.github/workflows/filebase-preview.yml

@@ -71,6 +71,9 @@ jobs:
           NEXT_PUBLIC_FORKED_PROVIDER_API_KEY: ${{ secrets.NEXT_PUBLIC_FORKED_PROVIDER_API_KEY }}
           NEXT_PUBLIC_POSTHOG_KEY: ${{ secrets.NEXT_PUBLIC_POSTHOG_KEY }}
           NEXT_PUBLIC_POSTHOG_HOST: ${{ secrets.NEXT_PUBLIC_POSTHOG_HOST }}
+          NEXT_PUBLIC_SERVICE_FEE_RECIPIENT: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_RECIPIENT || 'none' }}
+          NEXT_PUBLIC_SERVICE_FEE_DOT: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_DOT }}
+          NEXT_PUBLIC_SERVICE_FEE_KSM: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_KSM }}
         run: |
           [ -n "$NEXT_PUBLIC_SNOWBRIDGE_ENV" ] || { echo "::error::NEXT_PUBLIC_SNOWBRIDGE_ENV secret is not set (add the NEXT_PUBLIC_* repo secrets)."; exit 1; }
           pnpm build

.github/workflows/filebase.yml

@@ -60,8 +60,12 @@ jobs:
           NEXT_PUBLIC_FORKED_PROVIDER_API_KEY: ${{ secrets.NEXT_PUBLIC_FORKED_PROVIDER_API_KEY }}
           NEXT_PUBLIC_POSTHOG_KEY: ${{ secrets.NEXT_PUBLIC_POSTHOG_KEY }}
           NEXT_PUBLIC_POSTHOG_HOST: ${{ secrets.NEXT_PUBLIC_POSTHOG_HOST }}
+          NEXT_PUBLIC_SERVICE_FEE_RECIPIENT: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_RECIPIENT }}
+          NEXT_PUBLIC_SERVICE_FEE_DOT: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_DOT }}
+          NEXT_PUBLIC_SERVICE_FEE_KSM: ${{ secrets.NEXT_PUBLIC_SERVICE_FEE_KSM }}
         run: |
           [ -n "$NEXT_PUBLIC_SNOWBRIDGE_ENV" ] || { echo "::error::NEXT_PUBLIC_SNOWBRIDGE_ENV secret is not set (add the NEXT_PUBLIC_* repo secrets)."; exit 1; }
+          [ -n "$NEXT_PUBLIC_SERVICE_FEE_RECIPIENT" ] || { echo "::error::NEXT_PUBLIC_SERVICE_FEE_RECIPIENT secret is not set; service fees would go to the relayer."; exit 1; }
           pnpm build
 
       # Single source of the pin logic (scripts/deploy-filebase.sh). It pins the

hooks/useBridgeFeeInfo.ts

@@ -73,6 +73,9 @@ async function fetchBridgeFeeInfo([
       txValueUsd,
       ethToUsdNumerator: BigInt(ethPriceCents),
       ethToUsdDenominator: 100n,
+      // If set, the volume fee is deposited to this Asset Hub account instead of
+      // being added to the relayer fee.
+      serviceFeeRecipient: process.env.NEXT_PUBLIC_SERVICE_FEE_RECIPIENT,
     };
   }
 

vite.config.ts

@@ -77,11 +77,42 @@ function gzipStatic() {
   };
 }
 
-export default defineConfig(({ mode }) => {
+// Without a recipient the SDK pays the volume fee to the relayer, so a deployed
+// build must have one. Set it to "none" to build without a service fee.
+function assertServiceFeeRecipient(
+  value: string | undefined,
+  isBuild: boolean,
+) {
+  const label = "NEXT_PUBLIC_SERVICE_FEE_RECIPIENT";
+  if (value === "none") {
+    console.warn(
+      `[service fee] ${label}=none, the relayer keeps the volume fee.`,
+    );
+    return;
+  }
+  const valid = !!value && /^0x[0-9a-fA-F]{64}$/.test(value);
+  if (valid) return;
+  const reason = value
+    ? `${label} is not a 32-byte hex account: ${value}`
+    : `${label} is not set`;
+  if (isBuild) {
+    throw new Error(
+      `${reason}. A deployed build must collect service fees. Set it to a 32-byte ` +
+        `Asset Hub account, or to "none" to build without one.`,
+    );
+  }
+  console.warn(`[service fee] ${reason}, the relayer keeps the volume fee.`);
+}
+
+export default defineConfig(({ mode, command }) => {
   // Load .env files (incl. .env.local). The app reads config as
   // `process.env.NEXT_PUBLIC_*`; we keep those call sites untouched and
   // statically replace them at build time via `define`.
   const env = loadEnv(mode, process.cwd(), "");
+  assertServiceFeeRecipient(
+    env.NEXT_PUBLIC_SERVICE_FEE_RECIPIENT,
+    command === "build",
+  );
   const define: Record<string, string> = {};
   for (const [key, value] of Object.entries(env)) {
     if (key.startsWith("NEXT_PUBLIC_")) {