diff --git a/src/components/modals/budget-modal.tsx b/src/components/modals/budget-modal.tsx
index cc1445a..4307ee9 100644
--- a/src/components/modals/budget-modal.tsx
+++ b/src/components/modals/budget-modal.tsx
@@ -129,7 +129,7 @@ export function BudgetModal() {
 
       // Sphinx or WebLN: pay the invoice directly
       if (sphinxConnected || weblnAvailable) {
-        const payment = await payInvoice(result.payment_request)
+        const payment = await payInvoice(result.payment_request, macaroon)
         if (!payment) {
           setError("Payment was cancelled or failed.")
           setLoading(false)
diff --git a/src/lib/sphinx/bridge.ts b/src/lib/sphinx/bridge.ts
index a44071c..2c9a3ad 100644
--- a/src/lib/sphinx/bridge.ts
+++ b/src/lib/sphinx/bridge.ts
@@ -89,13 +89,22 @@ export function hasWebLN(): boolean {
   return !!(window as any).webln
 }
 
-export async function payInvoice(invoice: string): Promise<{ preimage: string } | null> {
+export async function payInvoice(invoice: string, macaroon?: string): Promise<{ preimage: string } | null> {
   if (typeof window === "undefined") return null
 
   if (isSphinx()) {
     try {
-      const result = await sphinx.sendPayment(invoice)
-      return result?.preimage ? { preimage: result.preimage } : null
+      // sphinx-bridge pays invoices via saveLsat (not sendPayment)
+      const result = await sphinx.saveLsat(
+        invoice,
+        macaroon ?? "",
+        window.location.host
+      )
+      if (result?.lsat) {
+        const preimage = result.lsat.split(":")[1]
+        return preimage ? { preimage } : null
+      }
+      return null
     } catch (error) {
       console.error("Sphinx payment failed:", error)
       return null