diff --git a/src/services/main/paymentManager.ts b/src/services/main/paymentManager.ts
index 617641f4..07021be5 100644
--- a/src/services/main/paymentManager.ts
+++ b/src/services/main/paymentManager.ts
@@ -595,9 +595,15 @@ export default class {
 
     async PayInternalAddress(ctx: Types.UserContext, req: Types.PayAddressRequest): Promise<Types.PayAddressResponse> {
         this.log("paying internal address")
+        let amount = req.amountSats
         if (req.swap_operation_id) {
+            const swap = await this.storage.paymentStorage.GetTransactionSwap(req.swap_operation_id, ctx.app_user_id)
+            amount = amount > 0 ? amount : swap?.invoice_amount || 0
             await this.storage.paymentStorage.DeleteTransactionSwap(req.swap_operation_id)
         }
+        if (amount <= 0) {
+            throw new Error("invalid tx amount")
+        }
         const { blockHeight } = await this.lnd.GetInfo()
         const app = await this.storage.applicationStorage.GetApplication(ctx.app_id)
         const isManagedUser = ctx.user_id !== app.owner.user_id
diff --git a/src/services/serverMethods/index.ts b/src/services/serverMethods/index.ts
index 21668449..6783e03d 100644
--- a/src/services/serverMethods/index.ts
+++ b/src/services/serverMethods/index.ts
@@ -184,7 +184,7 @@ export default (mainHandler: Main): Types.ServerMethods => {
         PayAddress: async ({ ctx, req }) => {
             const err = Types.PayAddressRequestValidate(req, {
                 address_CustomCheck: addr => addr !== '',
-                amountSats_CustomCheck: amt => amt > 0,
+                // amountSats_CustomCheck: amt => amt > 0,
                 // satsPerVByte_CustomCheck: spb => spb > 0
             })
             if (err != null) throw new Error(err.message)