diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
index adae97ae..0f307cd2 100644
--- a/npm-shrinkwrap.json
+++ b/npm-shrinkwrap.json
@@ -153,14 +153,12 @@
       }
     },
     "ripple-lib-transactionparser": {
-      "version": "0.5.0",
-      "resolved": "https://registry.npmjs.org/ripple-lib-transactionparser/-/ripple-lib-transactionparser-0.5.0.tgz",
-      "dependencies": {
-        "bignumber.js": {
-          "version": "1.4.1",
-          "resolved": "https://registry.npmjs.org/bignumber.js/-/bignumber.js-1.4.1.tgz"
-        }
-      }
+      "version": "0.5.1",
+      "resolved": "https://registry.npmjs.org/ripple-lib-transactionparser/-/ripple-lib-transactionparser-0.5.1.tgz"
+    },
+    "ripple-lib-value": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/ripple-lib-value/-/ripple-lib-value-0.1.0.tgz"
     },
     "sjcl-codec": {
       "version": "0.1.0",
diff --git a/package.json b/package.json
index c88d6096..d422f3cc 100644
--- a/package.json
+++ b/package.json
@@ -28,7 +28,8 @@
     "lru-cache": "~2.5.0",
     "ripple-address-codec": "^1.6.0",
     "ripple-keypairs": "^0.9.0",
-    "ripple-lib-transactionparser": "^0.5.0",
+    "ripple-lib-transactionparser": "^0.5.1",
+    "ripple-lib-value": "0.1.0",
     "sjcl-codec": "0.1.0",
     "ws": "~0.7.1"
   },
diff --git a/src/api/common/schemas/order-change.json b/src/api/common/schemas/order-change.json
index c298da51..ef377ac5 100644
--- a/src/api/common/schemas/order-change.json
+++ b/src/api/common/schemas/order-change.json
@@ -9,6 +9,7 @@
     },
     "quantity": {"$ref": "balance"},
     "totalPrice": {"$ref": "balance"},
+    "makerExchangeRate": {"$ref": "value"},
     "sequence": {"$ref": "sequence"},
     "status": {"enum": ["created", "open", "closed", "canceled"]}
   },
diff --git a/src/core/amount.js b/src/core/amount.js
index fdf99190..0a7a1224 100644
--- a/src/core/amount.js
+++ b/src/core/amount.js
@@ -8,15 +8,15 @@ const extend = require('extend');
 const utils = require('./utils');
 const UInt160 = require('./uint160').UInt160;
 const Currency = require('./currency').Currency;
-const Value = require('./value').Value;
-const IOUValue = require('./iouvalue').IOUValue;
-const XRPValue = require('./xrpvalue').XRPValue;
+const {XRPValue, IOUValue} = require('ripple-lib-value');
+
+type Value = XRPValue | IOUValue;
 
 function Amount(value = new XRPValue(NaN)) {
   // Json format:
   //  integer : XRP
   //  { 'value' : ..., 'currency' : ..., 'issuer' : ...}
-  assert(value instanceof Value);
+  assert(value instanceof XRPValue || value instanceof IOUValue);
 
   this._value = value;
   this._is_native = true; // Default to XRP. Only valid if value is not NaN.
@@ -625,7 +625,8 @@ function(quality, counterCurrency, counterIssuer, opts) {
   }
   if (this._is_native) {
     this._set_value(
-      new XRPValue(nativeAdjusted.round(6, Value.getBNRoundDown()).toString()));
+      new XRPValue(nativeAdjusted.round(6, XRPValue.getBNRoundDown())
+        .toString()));
   } else {
     this._set_value(nativeAdjusted);
   }
@@ -723,7 +724,7 @@ Amount.prototype.parse_native = function(j) {
 // Requires _currency to be set!
 Amount.prototype.parse_value = function(j) {
   this._is_native = false;
-  const newValue = new IOUValue(j, Value.getBNRoundDown());
+  const newValue = new IOUValue(j, IOUValue.getBNRoundDown());
   this._set_value(newValue);
   return this;
 };
diff --git a/src/core/index.js b/src/core/index.js
index 04a4109d..597855a7 100644
--- a/src/core/index.js
+++ b/src/core/index.js
@@ -20,7 +20,6 @@ exports.TransactionQueue = require('./transactionqueue').TransactionQueue;
 exports.convertBase = require('./baseconverter');
 
 exports._test = {
-  IOUValue: require('./iouvalue').IOUValue,
   Log: require('./log'),
   PathFind: require('./pathfind').PathFind,
   TransactionManager: require('./transactionmanager').TransactionManager,
diff --git a/src/core/iouvalue.js b/src/core/iouvalue.js
deleted file mode 100644
index babffecd..00000000
--- a/src/core/iouvalue.js
+++ /dev/null
@@ -1,56 +0,0 @@
-/* @flow */
-
-'use strict';
-
-const Value = require('./value').Value;
-const XRPValue = require('./xrpvalue').XRPValue;
-const GlobalBigNumber = require('bignumber.js');
-const BigNumber = GlobalBigNumber.another({
-  ROUNDING_MODE: GlobalBigNumber.ROUND_HALF_UP,
-  DECIMAL_PLACES: 40
-});
-const rippleUnits = new BigNumber(1e6);
-
-class IOUValue extends Value {
-
-  constructor(value: string | BigNumber, roundingMode: ?number = null,
-  base: ?number = null) {
-
-    super(new BigNumber(value, base).toDigits(16, roundingMode));
-  }
-
-  multiply(multiplicand: Value) {
-    if (multiplicand instanceof XRPValue) {
-      return super.multiply(
-        new IOUValue(
-          multiplicand._value.times(rippleUnits)));
-    }
-    return super.multiply(multiplicand);
-  }
-
-  divide(divisor: Value) {
-    if (divisor instanceof XRPValue) {
-      return super.divide(
-        new IOUValue(divisor._value.times(rippleUnits)));
-    }
-    return super.divide(divisor);
-  }
-
-  negate() {
-    return new IOUValue(this._value.neg());
-  }
-
-  _canonicalize(value) {
-    if (value.isNaN()) {
-      throw new Error('Invalid result');
-    }
-    return new IOUValue(value.toPrecision(16));
-  }
-
-  equals(comparator) {
-    return (comparator instanceof IOUValue)
-      && this._value.equals(comparator._value);
-  }
-}
-
-exports.IOUValue = IOUValue;
diff --git a/src/core/orderbook.js b/src/core/orderbook.js
index ed080f78..185f7ec0 100644
--- a/src/core/orderbook.js
+++ b/src/core/orderbook.js
@@ -22,7 +22,7 @@ const Currency = require('./currency').Currency;
 const AutobridgeCalculator = require('./autobridgecalculator');
 const OrderBookUtils = require('./orderbookutils');
 const log = require('./log').internal.sub('orderbook');
-const IOUValue = require('./iouvalue').IOUValue;
+const {IOUValue} = require('ripple-lib-value');
 
 function _sortOffers(a, b) {
   const aQuality = OrderBookUtils.getOfferQuality(a, this._currencyGets);
diff --git a/src/core/orderbookutils.js b/src/core/orderbookutils.js
index f43cc4a9..ec9eb90e 100644
--- a/src/core/orderbookutils.js
+++ b/src/core/orderbookutils.js
@@ -7,7 +7,7 @@ const Types = require('./serializedtypes');
 const Amount = require('./amount').Amount;
 const Currency = require('./currency').Currency;
 const UInt160 = require('./uint160').UInt160;
-const IOUValue = require('./iouvalue').IOUValue;
+const {IOUValue} = require('ripple-lib-value');
 const OrderBookUtils = {};
 
 function assertValidNumber(number, message) {
diff --git a/src/core/value.js b/src/core/value.js
deleted file mode 100644
index eea11495..00000000
--- a/src/core/value.js
+++ /dev/null
@@ -1,109 +0,0 @@
-/* @flow */
-
-'use strict';
-
-const GlobalBigNumber = require('bignumber.js');
-
-const BigNumber = GlobalBigNumber.another({
-  ROUNDING_MODE: GlobalBigNumber.ROUND_HALF_UP,
-  DECIMAL_PLACES: 40
-});
-
-const assert = require('assert');
-
-class Value {
-
-  constructor(value: string | BigNumber) {
-    if (this.constructor === 'Value') {
-      throw new Error(
-        'Cannot instantiate Value directly, it is an abstract base class');
-    }
-    this._value = new BigNumber(value);
-  }
-
-  static getBNRoundDown() {
-    return BigNumber.ROUND_DOWN;
-  }
-
-  abs() {
-    const result = this._value.abs();
-    return this._canonicalize(result);
-  }
-
-  add(addend: Value) {
-    assert(this.constructor === addend.constructor);
-    const result = this._value.plus(addend._value);
-    return this._canonicalize(result);
-  }
-
-  subtract(subtrahend: Value) {
-    assert(this.constructor === subtrahend.constructor);
-    const result = this._value.minus(subtrahend._value);
-    return this._canonicalize(result);
-  }
-
-  multiply(multiplicand: Value) {
-    const result = this._value.times(multiplicand._value);
-    return this._canonicalize(result);
-  }
-
-  divide(divisor: Value) {
-    if (divisor.isZero()) {
-      throw new Error('divide by zero');
-    }
-    const result = this._value.dividedBy(divisor._value);
-    return this._canonicalize(result);
-  }
-
-  invert() {
-    const result = (new BigNumber(this._value)).toPower(-1);
-    return this._canonicalize(result);
-  }
-
-  round(decimalPlaces: number, roundingMode: number) {
-    const result = this._value.round(decimalPlaces, roundingMode);
-    return this._canonicalize(result);
-  }
-
-  toFixed(decimalPlaces: number, roundingMode: number) {
-    return this._value.toFixed(decimalPlaces, roundingMode);
-  }
-
-  getExponent() {
-    return this._value.e;
-  }
-
-  isNaN() {
-    return this._value.isNaN();
-  }
-
-  isZero() {
-    return this._value.isZero();
-  }
-
-  isNegative() {
-    return this._value.isNegative();
-  }
-
-  toString() {
-    return this._value.toString();
-  }
-
-  greaterThan(comparator: Value) {
-    assert(this.constructor === comparator.constructor);
-    return this._value.greaterThan(comparator._value);
-  }
-
-  lessThan(comparator: Value) {
-    assert(this.constructor === comparator.constructor);
-    return this._value.lessThan(comparator._value);
-  }
-
-  comparedTo(comparator: Value) {
-    assert(this.constructor === comparator.constructor);
-    return this._value.comparedTo(comparator._value);
-  }
-
-}
-
-exports.Value = Value;
diff --git a/src/core/xrpvalue.js b/src/core/xrpvalue.js
deleted file mode 100644
index 47107847..00000000
--- a/src/core/xrpvalue.js
+++ /dev/null
@@ -1,59 +0,0 @@
-/* @flow */
-
-'use strict';
-
-const GlobalBigNumber = require('bignumber.js');
-const BigNumber = GlobalBigNumber.another({
-  ROUNDING_MODE: GlobalBigNumber.ROUND_HALF_UP,
-  DECIMAL_PLACES: 40
-});
-
-const Value = require('./value').Value;
-const rippleUnits = new BigNumber(1e6);
-
-class XRPValue extends Value {
-
-  constructor(value: string | BigNumber) {
-    super(value);
-    if (this._value.dp() > 6) {
-      throw new Error(
-        'Value has more than 6 digits of precision past the decimal point, '
-          + 'an IOUValue may be being cast to an XRPValue'
-        );
-    }
-  }
-
-  multiply(multiplicand: Value) {
-    if (multiplicand instanceof XRPValue) {
-      return super.multiply(
-        new XRPValue(multiplicand._value.times(rippleUnits)));
-    }
-    return super.multiply(multiplicand);
-  }
-
-  divide(divisor: Value) {
-    if (divisor instanceof XRPValue) {
-      return super.divide(
-        new XRPValue(divisor._value.times(rippleUnits)));
-    }
-    return super.divide(divisor);
-  }
-
-  negate() {
-    return new XRPValue(this._value.neg());
-  }
-
-  _canonicalize(value) {
-    if (value.isNaN()) {
-      throw new Error('Invalid result');
-    }
-    return new XRPValue(value.round(6, BigNumber.ROUND_DOWN));
-  }
-
-  equals(comparator) {
-    return (comparator instanceof XRPValue)
-      && this._value.equals(comparator._value);
-  }
-}
-
-exports.XRPValue = XRPValue;
diff --git a/test/fixtures/api/responses/get-transaction-order-cancellation.json b/test/fixtures/api/responses/get-transaction-order-cancellation.json
index 458433e1..91c83861 100644
--- a/test/fixtures/api/responses/get-transaction-order-cancellation.json
+++ b/test/fixtures/api/responses/get-transaction-order-cancellation.json
@@ -31,6 +31,7 @@
             "currency": "XRP",
             "value": "0"
           },
+          "makerExchangeRate": "1185000",
           "sequence": 465,
           "status": "canceled"
         }
@@ -39,4 +40,4 @@
     "ledgerVersion": 14661789,
     "indexInLedger": 4
   }
-}
+}
diff --git a/test/fixtures/api/responses/get-transaction-order.json b/test/fixtures/api/responses/get-transaction-order.json
index ea4b15dd..397e32ff 100644
--- a/test/fixtures/api/responses/get-transaction-order.json
+++ b/test/fixtures/api/responses/get-transaction-order.json
@@ -40,6 +40,7 @@
             "currency": "XRP",
             "value": "0.0002"
           },
+          "makerExchangeRate": "1185000",
           "sequence": 465,
           "status": "created"
         }
diff --git a/test/fixtures/api/responses/get-transaction-payment.json b/test/fixtures/api/responses/get-transaction-payment.json
index ed14494a..9bba564a 100644
--- a/test/fixtures/api/responses/get-transaction-payment.json
+++ b/test/fixtures/api/responses/get-transaction-payment.json
@@ -75,6 +75,7 @@
             "counterparty": "rpZc4mVfWUif9CRoHRKKcmhu1nx2xktxBo",
             "value": "-0.001002"
           },
+          "makerExchangeRate": "1099",
           "sequence": 58,
           "status": "open"
         }
diff --git a/test/fixtures/api/responses/get-transactions.json b/test/fixtures/api/responses/get-transactions.json
index 22cd3197..a026a502 100644
--- a/test/fixtures/api/responses/get-transactions.json
+++ b/test/fixtures/api/responses/get-transactions.json
@@ -81,6 +81,7 @@
               "counterparty": "rpZc4mVfWUif9CRoHRKKcmhu1nx2xktxBo",
               "value": "-0.001002"
             },
+            "makerExchangeRate": "1099",
             "sequence": 58,
             "status": "open"
           }
@@ -172,6 +173,7 @@
               "counterparty": "rpZc4mVfWUif9CRoHRKKcmhu1nx2xktxBo",
               "value": "-0.001002"
             },
+            "makerExchangeRate": "1099",
             "sequence": 58,
             "status": "open"
           }
diff --git a/test/fixtures/orderbook.js b/test/fixtures/orderbook.js
index 2568f264..4fe2c564 100644
--- a/test/fixtures/orderbook.js
+++ b/test/fixtures/orderbook.js
@@ -7,7 +7,7 @@ const addresses = require('./addresses');
 const Meta = require('ripple-lib').Meta;
 const SerializedObject = require('ripple-lib').SerializedObject;
 const Types = require('ripple-lib').types;
-const IOUValue = require('ripple-lib')._test.IOUValue;
+const IOUValue = require('ripple-lib-value').IOUValue;
 
 module.exports.FIAT_BALANCE = '10';
 module.exports.NATIVE_BALANCE = '55';
diff --git a/test/orderbook-autobridge-test.js b/test/orderbook-autobridge-test.js
index bb4bb51a..2345d8af 100644
--- a/test/orderbook-autobridge-test.js
+++ b/test/orderbook-autobridge-test.js
@@ -8,7 +8,7 @@ const Remote = require('ripple-lib').Remote;
 const Currency = require('ripple-lib').Currency;
 const addresses = require('./fixtures/addresses');
 const fixtures = require('./fixtures/orderbook');
-const IOUValue = require('ripple-lib')._test.IOUValue;
+const IOUValue = require('ripple-lib-value').IOUValue;
 
 describe('OrderBook Autobridging', function() {
   this.timeout(0);
diff --git a/test/orderbook-test.js b/test/orderbook-test.js
index fcca2bdc..67bcf4d5 100644
--- a/test/orderbook-test.js
+++ b/test/orderbook-test.js
@@ -9,7 +9,7 @@ const Amount = require('ripple-lib').Amount;
 const Meta = require('ripple-lib').Meta;
 const addresses = require('./fixtures/addresses');
 const fixtures = require('./fixtures/orderbook');
-const IOUValue = require('ripple-lib')._test.IOUValue;
+const IOUValue = require('ripple-lib-value').IOUValue;
 
 describe('OrderBook', function() {
   this.timeout(0);