From f324b72f007a72d25976a066f1f201b75990993f Mon Sep 17 00:00:00 2001
From: Adam Soltys <asoltys@gmail.com>
Date: Fri, 3 Apr 2020 15:13:41 -0700
Subject: return fee rate with estimate

---
 routes/bitcoin/fee.js | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'routes/bitcoin')

diff --git a/routes/bitcoin/fee.js b/routes/bitcoin/fee.js
index 259f2329..a2c63660 100644
--- a/routes/bitcoin/fee.js
+++ b/routes/bitcoin/fee.js
@@ -14,10 +14,13 @@ module.exports = async (req, res) => {
       subtractFeeFromOutputs: amount === user.balance ? [0] : []
     } 
 
-    if (feeRate) params["feeRate"] = (parseInt(feeRate) / SATS * 1000).toFixed(8);
+    if (feeRate) params["feeRate"] = (feeRate / SATS * 1000).toFixed(8);
 
     tx = await bc.fundRawTransaction(tx, params);
-    res.send({ tx });
+    let decoded = await bc.decodeRawTransaction(tx.hex);
+    /* TODO: figure out why this 0.8 multiplier seems necessary */
+    feeRate = (tx.fee * SATS / decoded.vsize) * 1000 * 0.80145;
+    res.send({ feeRate, tx });
   } catch (e) {
     l.error("bitcoin fee estimation error", e);
     return res.status(500).send(e.message);
-- 
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