diff --git a/README.md b/README.md
index b0f0de94..c934fe63 100644
--- a/README.md
+++ b/README.md
@@ -497,7 +497,7 @@ tx.addOutput({
 
 // Select coins from our array and add inputs.
 // Calculate fee and add a change output.
-tx.fill(coins, {
+tx.fund(coins, {
   // Use a rate of 10,000 satoshis per kb.
   // With the `fullnode` object, you can
   // use the fee estimator for this instead
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index ba8ec03a..fd07a46b 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -1164,7 +1164,7 @@ MTX.prototype.subtractFee = function subtractFee(fee, index) {
  * @returns {Object} See {@link MTX#selectCoins} return value.
  */
 
-MTX.prototype.fill = function fill(coins, options) {
+MTX.prototype.fund = function fund(coins, options) {
   var result, i, change, changeAddress;
 
   assert(this.inputs.length === 0, 'TX is already filled.');
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 37c1924b..3a5c610c 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -685,7 +685,7 @@ Wallet.prototype.getPath = function getPath(address, callback) {
  * fee from existing outputs rather than adding more inputs.
  */
 
-Wallet.prototype.fill = function fill(tx, options, callback) {
+Wallet.prototype.fund = function fund(tx, options, callback) {
   var self = this;
   var unlock, rate;
 
@@ -699,7 +699,7 @@ Wallet.prototype.fill = function fill(tx, options, callback) {
 
   // We use a lock here to ensure we
   // don't end up double spending coins.
-  unlock = this.fillLock.lock(fill, [tx, options, callback]);
+  unlock = this.fillLock.lock(fund, [tx, options, callback]);
 
   if (!unlock)
     return;
@@ -736,7 +736,7 @@ Wallet.prototype.fill = function fill(tx, options, callback) {
       }
 
       try {
-        tx.fill(coins, {
+        tx.fund(coins, {
           selection: options.selection || 'age',
           round: options.round,
           confirmed: options.confirmed,
@@ -790,7 +790,7 @@ Wallet.prototype.createTX = function createTX(options, callback) {
   }
 
   // Fill the inputs with unspents
-  this.fill(tx, options, function(err) {
+  this.fund(tx, options, function(err) {
     if (err)
       return callback(err);
 
diff --git a/test/wallet-test.js b/test/wallet-test.js
index a0d6798b..c684fbac 100644
--- a/test/wallet-test.js
+++ b/test/wallet-test.js
@@ -359,7 +359,7 @@ describe('Wallet', function() {
 
           // Create new transaction
           var t2 = bcoin.mtx().addOutput(w2, 5460);
-          w1.fill(t2, { rate: 10000, round: true }, function(err) {
+          w1.fund(t2, { rate: 10000, round: true }, function(err) {
             assert.ifError(err);
             w1.sign(t2, function(err) {
               assert.ifError(err);
@@ -375,7 +375,7 @@ describe('Wallet', function() {
 
               // Create new transaction
               var t3 = bcoin.mtx().addOutput(w2, 15000);
-              w1.fill(t3, { rate: 10000, round: true }, function(err) {
+              w1.fund(t3, { rate: 10000, round: true }, function(err) {
                 assert(err);
                 assert.equal(err.requiredFunds, 25000);
                 cb();
@@ -407,7 +407,7 @@ describe('Wallet', function() {
 
           // Create new transaction
           var t2 = bcoin.mtx().addOutput(w2, 5460);
-          w1.fill(t2, { rate: 10000 }, function(err) {
+          w1.fund(t2, { rate: 10000 }, function(err) {
             assert.ifError(err);
             w1.sign(t2, function(err) {
               assert.ifError(err);
@@ -434,7 +434,7 @@ describe('Wallet', function() {
               walletdb.addTX(t2, function(err) {
                 assert.ifError(err);
                 var t3 = bcoin.mtx().addOutput(w2, 15000);
-                w1.fill(t3, { rate: 10000 }, function(err) {
+                w1.fund(t3, { rate: 10000 }, function(err) {
                   assert(err);
                   assert(balance);
                   assert(balance.total === 5460);
@@ -664,7 +664,7 @@ describe('Wallet', function() {
               var send = bcoin.mtx();
               send.addOutput({ address: receive.getAddress(), value: 5460 });
               assert(!send.verify(flags));
-              w1.fill(send, { rate: 10000, round: true }, function(err) {
+              w1.fund(send, { rate: 10000, round: true }, function(err) {
                 assert.ifError(err);
 
                 w1.sign(send, function(err) {
@@ -774,7 +774,7 @@ describe('Wallet', function() {
 
               // Create new transaction
               var t2 = bcoin.mtx().addOutput(w2, 5460);
-              w1.fill(t2, { rate: 10000, round: true }, function(err) {
+              w1.fund(t2, { rate: 10000, round: true }, function(err) {
                 assert.ifError(err);
                 w1.sign(t2, function(err) {
                   assert.ifError(err);
@@ -790,7 +790,7 @@ describe('Wallet', function() {
 
                   // Create new transaction
                   var t3 = bcoin.mtx().addOutput(w2, 15000);
-                  w1.fill(t3, { rate: 10000, round: true }, function(err) {
+                  w1.fund(t3, { rate: 10000, round: true }, function(err) {
                     assert(err);
                     assert.equal(err.requiredFunds, 25000);
                     w1.getAccounts(function(err, accounts) {
@@ -840,11 +840,11 @@ describe('Wallet', function() {
 
             // Should fill from `foo` and fail
             var t2 = bcoin.mtx().addOutput(w1, 5460);
-            w1.fill(t2, { rate: 10000, round: true, account: 'foo' }, function(err) {
+            w1.fund(t2, { rate: 10000, round: true, account: 'foo' }, function(err) {
               assert(err);
               // Should fill from whole wallet and succeed
               var t2 = bcoin.mtx().addOutput(w1, 5460);
-              w1.fill(t2, { rate: 10000, round: true }, function(err) {
+              w1.fund(t2, { rate: 10000, round: true }, function(err) {
                 assert.ifError(err);
 
                 // Coinbase
@@ -859,7 +859,7 @@ describe('Wallet', function() {
                   assert.ifError(err);
                   var t2 = bcoin.mtx().addOutput(w1, 5460);
                   // Should fill from `foo` and succeed
-                  w1.fill(t2, { rate: 10000, round: true, account: 'foo' }, function(err) {
+                  w1.fund(t2, { rate: 10000, round: true, account: 'foo' }, function(err) {
                     assert.ifError(err);
                     cb();
                   });
@@ -892,7 +892,7 @@ describe('Wallet', function() {
 
         // Create new transaction
         var t2 = bcoin.mtx().addOutput(w1, 5460);
-        w1.fill(t2, { rate: 10000, round: true }, function(err) {
+        w1.fund(t2, { rate: 10000, round: true }, function(err) {
           assert.ifError(err);
           // Should fail
           w1.sign(t2, 'bar', function(err) {
@@ -930,7 +930,7 @@ describe('Wallet', function() {
 
           // Create new transaction
           var t2 = bcoin.mtx().addOutput(w2, 21840);
-          w1.fill(t2, { rate: 10000, round: true, subtractFee: true }, function(err) {
+          w1.fund(t2, { rate: 10000, round: true, subtractFee: true }, function(err) {
             assert.ifError(err);
             w1.sign(t2, function(err) {
               assert.ifError(err);