default maxfee to 5% of total

1 files changed, 3 insertions, 2 deletions

diff --git a/lib/payments.js b/lib/payments.js
index f53fc2c4..e7674f4e 100644
--- a/lib/payments.js
+++ b/lib/payments.js
@@ -236,13 +236,14 @@ export let payLightning = async (user, payreq, amount, maxfee, memo) => {
     if (amount < 0 || amount > SATS || isNaN(amount)) fail("Invalid amount");
   }
 
-  maxfee = maxfee ? parseInt(maxfee) : 0;
-  if (maxfee < 0) fail("Max fee cannot be negative");
 
   let total = amount;
   let { amount_msat, payment_hash } = await ln.decode(payreq);
   if (amount_msat) total = Math.round(amount_msat / 1000);
 
+  maxfee = maxfee ? parseInt(maxfee) : Math.round(total * 0.05);
+  if (maxfee < 0) fail("Max fee cannot be negative");
+
   let iid = await g(`invoice:${hash}`);
   if (iid && iid.hash) iid = iid.hash;
   let invoice = await g(`invoice:${iid}`);