diff --git a/src/routes.js b/src/routes.js
index d008cc66..dcc47eb8 100644
--- a/src/routes.js
+++ b/src/routes.js
@@ -1190,6 +1190,20 @@ module.exports = async (
         })
       }
 
+      if (!isARealUsableNumber(feeLimit)) {
+        return res.status(400).json({
+          field: 'feeLimit',
+          errorMessage: 'Not an usable number'
+        })
+      }
+
+      if (feeLimit < 1) {
+        return res.status(400).json({
+          field: 'feeLimit',
+          errorMessage: 'Must be 1 or greater.'
+        })
+      }
+
       return res
         .status(200)
         .json(await GunActions.sendSpontaneousPayment(to, amt, memo, feeLimit))
diff --git a/utils/lightningServices/v2.js b/utils/lightningServices/v2.js
index f0b0a80b..ee6204a9 100644
--- a/utils/lightningServices/v2.js
+++ b/utils/lightningServices/v2.js
@@ -284,7 +284,9 @@ const sendPaymentV2Keysend = params => {
   } = params
 
   if (!isValidSendPaymentKeysendParams(params)) {
-    throw new TypeError('Invalid SendPaymentKeysendParams')
+    throw new TypeError(
+      `Invalid SendPaymentKeysendParams: ${JSON.stringify(params)}`
+    )
   }
 
   const preimage = Crypto.randomBytes(32)
@@ -321,7 +323,9 @@ const sendPaymentV2Invoice = params => {
   } = params
 
   if (!isValidSendPaymentInvoiceParams(params)) {
-    throw new TypeError('Invalid SendPaymentInvoiceParams')
+    throw new TypeError(
+      `Invalid SendPaymentInvoiceParams: ${JSON.stringify(params)}`
+    )
   }
 
   return sendPaymentV2({