diff --git a/BTCPayServer/Controllers/AppsPublicController.cs b/BTCPayServer/Controllers/AppsPublicController.cs
index 98c07d9fc..8f298946b 100644
--- a/BTCPayServer/Controllers/AppsPublicController.cs
+++ b/BTCPayServer/Controllers/AppsPublicController.cs
@@ -237,6 +237,10 @@ namespace BTCPayServer.Controllers
         [EnableCors(CorsPolicies.All)]
         public async Task<IActionResult> ContributeToCrowdfund(string appId, ContributeToCrowdfund request, CancellationToken cancellationToken)
         {
+            if (request.Amount <= 0)
+            {
+                return NotFound("Please provide an amount greater than 0");
+            }
             var app = await _AppService.GetApp(appId, AppType.Crowdfund, true);
 
             if (app == null)
diff --git a/BTCPayServer/Controllers/PaymentRequestController.cs b/BTCPayServer/Controllers/PaymentRequestController.cs
index 02f11d1f7..063dc6eb8 100644
--- a/BTCPayServer/Controllers/PaymentRequestController.cs
+++ b/BTCPayServer/Controllers/PaymentRequestController.cs
@@ -225,6 +225,10 @@ namespace BTCPayServer.Controllers
         public async Task<IActionResult> PayPaymentRequest(string id, bool redirectToInvoice = true,
             decimal? amount = null, CancellationToken cancellationToken = default)
         {
+            if (amount.HasValue && amount.Value <= 0)
+            {
+                return BadRequest("Please provide an amount greater than 0");
+            }
             var result = await _PaymentRequestService.GetPaymentRequest(id, GetUserId());
             if (result == null)
             {