diff --git a/lib/bcoin/abstractblock.js b/lib/bcoin/abstractblock.js
index 5cb65ce3..fc68ee19 100644
--- a/lib/bcoin/abstractblock.js
+++ b/lib/bcoin/abstractblock.js
@@ -153,4 +153,8 @@ AbstractBlock.prototype.__defineGetter__('rhash', function() {
   return utils.revHex(this.hash('hex'));
 });
 
+/*
+ * Expose
+ */
+
 module.exports = AbstractBlock;
diff --git a/lib/bcoin/address.js b/lib/bcoin/address.js
index 5858c33b..d5e6943a 100644
--- a/lib/bcoin/address.js
+++ b/lib/bcoin/address.js
@@ -467,4 +467,9 @@ Address.getHash = function getHash(data) {
 
   return hash.toString('hex');
 };
+
+/*
+ * Expose
+ */
+
 module.exports = Address;
diff --git a/lib/bcoin/block.js b/lib/bcoin/block.js
index e11b4965..fe236ecf 100644
--- a/lib/bcoin/block.js
+++ b/lib/bcoin/block.js
@@ -426,7 +426,7 @@ Block.prototype.getCoinbaseHeight = function getCoinbaseHeight() {
 
 /**
  * Calculate the block reward.
- * @returns {BN} reward
+ * @returns {Amount} reward
  */
 
 Block.prototype.getReward = function getReward(network) {
@@ -457,7 +457,7 @@ Block.prototype.getReward = function getReward(network) {
 
 /**
  * Get the "claimed" reward by the coinbase.
- * @returns {BN} claimed
+ * @returns {Amount} claimed
  */
 
 Block.prototype.getClaimed = function getClaimed() {
@@ -469,7 +469,7 @@ Block.prototype.getClaimed = function getClaimed() {
 /**
  * Calculate block subsidy.
  * @param {Number} height - Reward era by height.
- * @returns {BN}
+ * @returns {Amount}
  */
 
 Block.reward = function _reward(height, network) {
@@ -682,4 +682,8 @@ Block.isBlock = function isBlock(obj) {
     && typeof obj.toCompact === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Block;
diff --git a/lib/bcoin/bloom.js b/lib/bcoin/bloom.js
index dd0c3e40..046079e1 100644
--- a/lib/bcoin/bloom.js
+++ b/lib/bcoin/bloom.js
@@ -236,4 +236,8 @@ function murmur(data, seed) {
 
 Bloom.hash = murmur;
 
+/*
+ * Expose
+ */
+
 module.exports = Bloom;
diff --git a/lib/bcoin/bst.js b/lib/bcoin/bst.js
index 791a82d3..0d3d1d25 100644
--- a/lib/bcoin/bst.js
+++ b/lib/bcoin/bst.js
@@ -716,4 +716,8 @@ function clone(node) {
   };
 }
 
+/*
+ * Expose
+ */
+
 module.exports = BST;
diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index efd82250..c79f3eff 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -2502,4 +2502,8 @@ Chain.prototype.checkLocks = function checkLocks(prev, tx, flags, callback) {
   });
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Chain;
diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 4d925ec4..cf66fc57 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -1464,6 +1464,12 @@ ChainDB.prototype._pruneBlock = function _pruneBlock(block, batch, callback) {
   });
 };
 
+/**
+ * A null cache. Every method is a NOP.
+ * @constructor
+ * @param {Number} size
+ */
+
 function NullCache(size) {}
 
 NullCache.prototype.set = function set(key, value) {};
@@ -1472,4 +1478,8 @@ NullCache.prototype.get = function get(key) {};
 NullCache.prototype.has = function has(key) {};
 NullCache.prototype.reset = function reset() {};
 
+/*
+ * Expose
+ */
+
 module.exports = ChainDB;
diff --git a/lib/bcoin/chainentry.js b/lib/bcoin/chainentry.js
index d0a99806..016adf1f 100644
--- a/lib/bcoin/chainentry.js
+++ b/lib/bcoin/chainentry.js
@@ -487,4 +487,8 @@ ChainEntry.isChainEntry = function isChainEntry(obj) {
     && typeof obj.getMedianTime === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = ChainEntry;
diff --git a/lib/bcoin/coin.js b/lib/bcoin/coin.js
index 7c94c982..ced0ed9a 100644
--- a/lib/bcoin/coin.js
+++ b/lib/bcoin/coin.js
@@ -22,7 +22,7 @@ var assert = utils.assert;
  * @param {Number?} index - Output index.
  * @property {Number} version - Transaction version.
  * @property {Number} height - Transaction height (-1 if unconfirmed).
- * @property {BN} value - Output value in satoshis.
+ * @property {Amount} value - Output value in satoshis.
  * @property {Script} script - Output script.
  * @property {Boolean} coinbase - Whether the containing
  * transaction is a coinbase.
@@ -280,4 +280,8 @@ Coin.isCoin = function isCoin(obj) {
     && typeof obj.getConfirmations === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Coin;
diff --git a/lib/bcoin/coins.js b/lib/bcoin/coins.js
index 9e161cd3..4f55b42e 100644
--- a/lib/bcoin/coins.js
+++ b/lib/bcoin/coins.js
@@ -273,4 +273,8 @@ Coins.fromRaw = function fromRaw(buf, hash) {
   return new Coins(Coins.parseRaw(buf), hash);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Coins;
diff --git a/lib/bcoin/coinview.js b/lib/bcoin/coinview.js
index e57e21d6..76507cfd 100644
--- a/lib/bcoin/coinview.js
+++ b/lib/bcoin/coinview.js
@@ -161,4 +161,8 @@ CoinView.prototype.toArray = function toArray() {
   return out;
 };
 
+/*
+ * Expose
+ */
+
 module.exports = CoinView;
diff --git a/lib/bcoin/compactblock.js b/lib/bcoin/compactblock.js
index 25ae3fda..e1eb44b3 100644
--- a/lib/bcoin/compactblock.js
+++ b/lib/bcoin/compactblock.js
@@ -116,4 +116,8 @@ CompactBlock.isCompactBlock = function isCompactBlock(obj) {
   return obj && typeof obj.toBlock === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = CompactBlock;
diff --git a/lib/bcoin/errors.js b/lib/bcoin/errors.js
index f6080757..adaac1ae 100644
--- a/lib/bcoin/errors.js
+++ b/lib/bcoin/errors.js
@@ -109,5 +109,9 @@ function ScriptError(code, op, ip) {
 
 utils.inherits(ScriptError, Error);
 
+/*
+ * Expose
+ */
+
 exports.VerifyError = VerifyError;
 exports.ScriptError = ScriptError;
diff --git a/lib/bcoin/fullnode.js b/lib/bcoin/fullnode.js
index 618cd654..342dbeb4 100644
--- a/lib/bcoin/fullnode.js
+++ b/lib/bcoin/fullnode.js
@@ -601,4 +601,8 @@ Fullnode.prototype.getConfidence = function getConfidence(tx, callback) {
   return this.mempool.getConfidence(tx, callback);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Fullnode;
diff --git a/lib/bcoin/headers.js b/lib/bcoin/headers.js
index 840ac6c1..b60548ae 100644
--- a/lib/bcoin/headers.js
+++ b/lib/bcoin/headers.js
@@ -154,4 +154,8 @@ Headers.isHeaders = function isHeaders(obj) {
     && typeof obj.toBlock !== 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Headers;
diff --git a/lib/bcoin/http/base.js b/lib/bcoin/http/base.js
index 7af4228d..cda1d83b 100644
--- a/lib/bcoin/http/base.js
+++ b/lib/bcoin/http/base.js
@@ -506,4 +506,8 @@ function unescape(str) {
   }
 }
 
+/*
+ * Expose
+ */
+
 module.exports = HTTPBase;
diff --git a/lib/bcoin/http/client.js b/lib/bcoin/http/client.js
index b8b9dcce..a38abfba 100644
--- a/lib/bcoin/http/client.js
+++ b/lib/bcoin/http/client.js
@@ -769,7 +769,7 @@ HTTPClient.prototype.broadcast = function broadcast(tx, callback) {
  * @param {WalletID} id
  * @param {Object} options
  * @param {Base58Address} options.address
- * @param {BN} options.value
+ * @param {Amount} options.value
  * @param {Function} callback - Returns [Error, {@link TX}].
  */
 
@@ -913,4 +913,8 @@ HTTPClient.prototype.getInfo = function getInfo(callback) {
   });
 };
 
+/*
+ * Expose
+ */
+
 module.exports = HTTPClient;
diff --git a/lib/bcoin/http/provider.js b/lib/bcoin/http/provider.js
index d388f773..c1a42a3e 100644
--- a/lib/bcoin/http/provider.js
+++ b/lib/bcoin/http/provider.js
@@ -202,4 +202,8 @@ HTTPProvider.prototype.zap = function zap(now, age, callback) {
   return this.client.zapWallet(this.id, now, age, callback);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = HTTPProvider;
diff --git a/lib/bcoin/http/request.js b/lib/bcoin/http/request.js
index bd6b9b01..add19586 100644
--- a/lib/bcoin/http/request.js
+++ b/lib/bcoin/http/request.js
@@ -336,4 +336,8 @@ ReqStream.prototype.destroy = function destroy() {
   }
 };
 
+/*
+ * Expose
+ */
+
 module.exports = request;
diff --git a/lib/bcoin/http/server.js b/lib/bcoin/http/server.js
index 153761ef..74fdfb39 100644
--- a/lib/bcoin/http/server.js
+++ b/lib/bcoin/http/server.js
@@ -785,4 +785,8 @@ HTTPServer.prototype.listen = function listen(port, host, callback) {
   });
 };
 
+/*
+ * Expose
+ */
+
 module.exports = HTTPServer;
diff --git a/lib/bcoin/input.js b/lib/bcoin/input.js
index e4ab3487..0c0f5da8 100644
--- a/lib/bcoin/input.js
+++ b/lib/bcoin/input.js
@@ -429,4 +429,8 @@ Input.isInput = function isInput(obj) {
     && typeof obj.getAddress === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Input;
diff --git a/lib/bcoin/keypair.js b/lib/bcoin/keypair.js
index e50dbfc6..d5ac5d4f 100644
--- a/lib/bcoin/keypair.js
+++ b/lib/bcoin/keypair.js
@@ -276,4 +276,8 @@ KeyPair.fromJSON = function fromJSON(json, passphrase) {
   return new KeyPair(KeyPair.parseJSON(json, passphrase));
 };
 
+/*
+ * Expose
+ */
+
 module.exports = KeyPair;
diff --git a/lib/bcoin/keyring.js b/lib/bcoin/keyring.js
index 28da7658..0b370f8f 100644
--- a/lib/bcoin/keyring.js
+++ b/lib/bcoin/keyring.js
@@ -659,4 +659,8 @@ KeyRing.fromJSON = function fromJSON(json, passphrase) {
   return w;
 };
 
+/*
+ * Expose
+ */
+
 module.exports = KeyRing;
diff --git a/lib/bcoin/ldb.js b/lib/bcoin/ldb.js
index 34b88079..eccfe318 100644
--- a/lib/bcoin/ldb.js
+++ b/lib/bcoin/ldb.js
@@ -127,7 +127,13 @@ function repair(options, callback) {
   backend.repair(file, callback);
 }
 
-ldb.destroy = destroy;
-ldb.repair = repair;
+/*
+ * Expose
+ */
 
-module.exports = ldb;
+exports = ldb;
+
+exports.destroy = destroy;
+exports.repair = repair;
+
+module.exports = exports;
diff --git a/lib/bcoin/locker.js b/lib/bcoin/locker.js
index fb4cb437..5f76b5b4 100644
--- a/lib/bcoin/locker.js
+++ b/lib/bcoin/locker.js
@@ -164,4 +164,8 @@ Locker.prototype.onFlush = function onFlush(callback) {
   this.once('flush', callback);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Locker;
diff --git a/lib/bcoin/lowlevelup.js b/lib/bcoin/lowlevelup.js
index 0ff3eda5..c4d70b7c 100644
--- a/lib/bcoin/lowlevelup.js
+++ b/lib/bcoin/lowlevelup.js
@@ -338,4 +338,8 @@ LowlevelUp.prototype.lookup = function lookup(options, callback) {
   });
 };
 
+/*
+ * Expose
+ */
+
 module.exports = LowlevelUp;
diff --git a/lib/bcoin/lru.js b/lib/bcoin/lru.js
index f7e5c20e..05f0973e 100644
--- a/lib/bcoin/lru.js
+++ b/lib/bcoin/lru.js
@@ -305,4 +305,8 @@ LRU.prototype.toArray = function toArray() {
   return items;
 };
 
+/*
+ * Expose
+ */
+
 module.exports = LRU;
diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 0356566e..17cfd154 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -32,6 +32,7 @@ var DUMMY = new Buffer([0]);
  * @param {String?} options.db - Database backend (`"memory"` by default).
  * @param {Boolean?} options.limitFree
  * @param {Number?} options.limitFreeRelay
+ * @param {Number?} options.maxSize - Max pool size (default ~300mb).
  * @param {Boolean?} options.relayPriority
  * @param {Boolean?} options.requireStandard
  * @param {Boolean?} options.rejectAbsurdFees
@@ -43,6 +44,12 @@ var DUMMY = new Buffer([0]);
  * @property {Locker} locker
  * @property {Number} freeCount
  * @property {Number} lastTime
+ * @property {Number} maxSize
+ * @property {Boolean} blockSinceBump
+ * @property {Number} lastFeeUpdate
+ * @property {Rate} minFeeRate
+ * @property {Rate} minReasonableFee
+ * @property {Rate} minRelayFee
  * @emits Mempool#open
  * @emits Mempool#error
  * @emits Mempool#tx
@@ -92,9 +99,9 @@ function Mempool(options) {
   this.accurateMemory = !!this.options.accurateMemory;
 
   this.maxSize = options.maxSize || constants.mempool.MAX_MEMPOOL_SIZE;
-  this.minFeeRate = 0;
   this.blockSinceBump = false;
   this.lastFeeUpdate = utils.now();
+  this.minFeeRate = 0;
   this.minReasonableFee = constants.tx.MIN_RELAY;
   this.minRelayFee = constants.tx.MIN_RELAY;
 
@@ -861,7 +868,7 @@ Mempool.prototype.removeUnchecked = function removeUnchecked(entry, limit, callb
 
 /**
  * Calculate and update the minimum rolling fee rate.
- * @returns {Number} Rate.
+ * @returns {Rate} Rate.
  */
 
 Mempool.prototype.getMinRate = function getMinRate() {
@@ -1789,20 +1796,20 @@ Mempool.prototype.getSize = function getSize() {
  * @param {Object} options
  * @param {TX} options.tx - Transaction in mempool.
  * @param {Number} options.height - Entry height.
- * @param {BN} options.priority - Entry priority.
+ * @param {Number} options.priority - Entry priority.
  * @param {Number} options.ts - Entry time.
- * @param {BN} options.chainValue - Value of on-chain coins.
+ * @param {Amount} options.chainValue - Value of on-chain coins.
  * @param {Number} options.count - Number of descendants (includes tx).
  * @param {Number} options.size - TX and descendant modified size.
- * @param {BN} options.fees - TX and descendant delta-applied fees.
+ * @param {Amount} options.fees - TX and descendant delta-applied fees.
  * @property {TX} tx
  * @property {Number} height
- * @property {BN} priority
+ * @property {Number} priority
  * @property {Number} ts
- * @property {BN} chainValue
+ * @property {Amount} chainValue
  * @property {Number} count
  * @property {Number} size
- * @property {BN} fees
+ * @property {Amount} fees
  */
 
 function MempoolEntry(options) {
@@ -1890,7 +1897,7 @@ MempoolEntry.fromRaw = function fromRaw(data) {
  * the entry height delta, modified size,
  * and chain value.
  * @param {Number} height
- * @returns {BN} Priority.
+ * @returns {Number} Priority.
  */
 
 MempoolEntry.prototype.getPriority = function getPriority(height) {
@@ -1953,4 +1960,8 @@ function mallocUsage(alloc) {
 
 Mempool.MempoolEntry = MempoolEntry;
 
+/*
+ * Expose
+ */
+
 module.exports = Mempool;
diff --git a/lib/bcoin/merkleblock.js b/lib/bcoin/merkleblock.js
index 5a85046c..c7db120b 100644
--- a/lib/bcoin/merkleblock.js
+++ b/lib/bcoin/merkleblock.js
@@ -402,4 +402,8 @@ MerkleBlock.isMerkleBlock = function isMerkleBlock(obj) {
     && typeof obj.verifyPartial === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = MerkleBlock;
diff --git a/lib/bcoin/miner.js b/lib/bcoin/miner.js
index 6ccf06db..3a78c942 100644
--- a/lib/bcoin/miner.js
+++ b/lib/bcoin/miner.js
@@ -674,4 +674,8 @@ function rcmp(a, b) {
 
 Miner.MinerBlock = MinerBlock;
 
+/*
+ * Expose
+ */
+
 module.exports = Miner;
diff --git a/lib/bcoin/mtx.js b/lib/bcoin/mtx.js
index fe8ddce1..5758f8cf 100644
--- a/lib/bcoin/mtx.js
+++ b/lib/bcoin/mtx.js
@@ -784,7 +784,7 @@ MTX.prototype.sign = function sign(index, addr, type) {
  * tx.addOutput(receivingWallet, utils.satoshi('0.1'));
  * @param {Wallet|Address|Object} obj - Wallet, Address,
  * or options (see {@link Script.createOutputScript} for options).
- * @param {BN?} value - Only needs to be present for non-options.
+ * @param {Amount?} value - Only needs to be present for non-options.
  */
 
 MTX.prototype.addOutput = function addOutput(address, value) {
@@ -1053,7 +1053,8 @@ MTX.prototype.maxSize = function maxSize(options, force) {
  * @param {Boolean} options.confirmed - Select only confirmed coins.
  * @param {Boolean} options.free - Do not apply a fee if the
  * transaction priority is high enough to be considered free.
- * @param {BN?} options.fee - Use a hard fee rather than calculating one.
+ * @param {Amount?} options.fee - Use a hard fee rather than calculating one.
+ * @param {Rate?} options.rate - Rate used for fee calculation.
  * @param {Number|Boolean} options.subtractFee - Whether to subtract the
  * fee from * existing outputs rather than adding more inputs.
  * @returns {CoinSelection}
@@ -1423,4 +1424,8 @@ MTX.isMTX = function isMTX(obj) {
     && typeof obj.scriptInput === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = MTX;
diff --git a/lib/bcoin/network.js b/lib/bcoin/network.js
index 66f510c8..090ebe4c 100644
--- a/lib/bcoin/network.js
+++ b/lib/bcoin/network.js
@@ -15,8 +15,8 @@ var network = require('./protocol/network');
  * @constructor
  * @param {Object|String} options - See {@link module:network}.
  * @property {Number} height
- * @property {Number} feeRate
- * @property {Number} minRelay
+ * @property {Rate} feeRate
+ * @property {Rate} minRelay
  */
 
 function Network(options) {
@@ -66,7 +66,7 @@ Network.prototype.updateHeight = function updateHeight(height) {
 
 /**
  * Update the estimated fee rate of the network.
- * @param {Number} rate
+ * @param {Rate} rate
  */
 
 Network.prototype.updateRate = function updateRate(rate) {
@@ -75,7 +75,7 @@ Network.prototype.updateRate = function updateRate(rate) {
 
 /**
  * Update the minimum relay rate (reject rate) of the network.
- * @param {Number} rate
+ * @param {Rate} rate
  */
 
 Network.prototype.updateMinRelay = function updateMinRelay(rate) {
@@ -85,7 +85,7 @@ Network.prototype.updateMinRelay = function updateMinRelay(rate) {
 /**
  * Calculate the minimum relay rate. If the network is
  * inactive (height=-1), return the default minimum relay.
- * @return {Number} Rate
+ * @return {Rate} Rate
  */
 
 Network.prototype.getMinRelay = function getMinRelay() {
@@ -98,7 +98,7 @@ Network.prototype.getMinRelay = function getMinRelay() {
 /**
  * Calculate the normal relay rate. If the network is
  * inactive (height=-1), return the default rate.
- * @return {Number} Rate
+ * @return {Rate} Rate
  */
 
 Network.prototype.getRate = function getRate() {
@@ -161,4 +161,8 @@ Network.prototype.inspect = function inspect() {
   return '<Network: ' + this.type + '>';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Network;
diff --git a/lib/bcoin/node.js b/lib/bcoin/node.js
index e2ea7f0b..2b795288 100644
--- a/lib/bcoin/node.js
+++ b/lib/bcoin/node.js
@@ -39,4 +39,8 @@ function Node(options) {
 
 utils.inherits(Node, EventEmitter);
 
+/*
+ * Expose
+ */
+
 module.exports = Node;
diff --git a/lib/bcoin/output.js b/lib/bcoin/output.js
index 52e2200f..b9512b9e 100644
--- a/lib/bcoin/output.js
+++ b/lib/bcoin/output.js
@@ -18,7 +18,7 @@ var Framer = bcoin.protocol.framer;
  * @constructor
  * @param {NakedOutput} options
  * @param {Boolean?} mutable
- * @property {BN} value - Value in satoshis.
+ * @property {Amount} value - Value in satoshis.
  * @property {Script} script
  * @property {String} type - Script type.
  * @property {String?} address - Input address.
@@ -151,8 +151,8 @@ Output.prototype.toJSON = function toJSON() {
 /**
  * Calculate the dust threshold for this
  * output, based on serialize size and rate.
- * @param {Number?} rate
- * @returns {BN}
+ * @param {Rate?} rate
+ * @returns {Amount}
  */
 
 Output.prototype.getDustThreshold = function getDustThreshold(rate) {
@@ -172,7 +172,7 @@ Output.prototype.getDustThreshold = function getDustThreshold(rate) {
 
 /**
  * Test whether the output should be considered dust.
- * @param {Number?} rate
+ * @param {Rate?} rate
  * @returns {Boolean}
  */
 
@@ -259,4 +259,8 @@ Output.isOutput = function isOutput(obj) {
     && typeof obj.getAddress === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Output;
diff --git a/lib/bcoin/peer.js b/lib/bcoin/peer.js
index 7d63fa1c..0d22ce41 100644
--- a/lib/bcoin/peer.js
+++ b/lib/bcoin/peer.js
@@ -1445,4 +1445,8 @@ Peer.prototype.sendReject = function sendReject(obj, code, reason, score) {
   return this.pool.reject(this, obj, code, reason, score);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Peer;
diff --git a/lib/bcoin/pool.js b/lib/bcoin/pool.js
index 86412658..4db17635 100644
--- a/lib/bcoin/pool.js
+++ b/lib/bcoin/pool.js
@@ -2321,4 +2321,8 @@ LoadRequest.prototype.finish = function finish() {
   }
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Pool;
diff --git a/lib/bcoin/protocol/constants.js b/lib/bcoin/protocol/constants.js
index 426ab9fb..54e400d9 100644
--- a/lib/bcoin/protocol/constants.js
+++ b/lib/bcoin/protocol/constants.js
@@ -301,7 +301,7 @@ exports.opcodesByVal = utils.revMap(exports.opcodes);
 
 /**
  * One bitcoin in satoshis.
- * @const {BN}
+ * @const {Amount}
  * @default
  */
 
@@ -309,7 +309,7 @@ exports.COIN = 100000000;
 
 /**
  * One bitcoin / 100.
- * @const {BN}
+ * @const {Amount}
  * @default
  */
 
@@ -317,7 +317,7 @@ exports.CENT = 1000000;
 
 /**
  * Maximum amount of money in satoshis (1btc * 21million)
- * @const {BN}
+ * @const {Amount}
  * @default
  */
 
diff --git a/lib/bcoin/protocol/framer.js b/lib/bcoin/protocol/framer.js
index 901f8ea2..9b50770b 100644
--- a/lib/bcoin/protocol/framer.js
+++ b/lib/bcoin/protocol/framer.js
@@ -1514,4 +1514,8 @@ Framer.tx.cost = function txCost(tx) {
   return base * (scale - 1) + sizes.size;
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Framer;
diff --git a/lib/bcoin/protocol/network.js b/lib/bcoin/protocol/network.js
index d435876d..b85369e8 100644
--- a/lib/bcoin/protocol/network.js
+++ b/lib/bcoin/protocol/network.js
@@ -416,7 +416,7 @@ main.rpcPort = 8332;
 
 /**
  * Default min relay rate (the rate for mempoolRejectFee).
- * @const {Number}
+ * @const {Rate}
  * @default
  */
 
@@ -424,7 +424,7 @@ main.minRelay = 10000;
 
 /**
  * Default normal relay rate.
- * @const {Number}
+ * @const {Rate}
  * @default
  */
 
@@ -432,7 +432,7 @@ main.feeRate = 40000;
 
 /**
  * Default min rate.
- * @const {Number}
+ * @const {Rate}
  * @default
  */
 
@@ -440,7 +440,7 @@ main.minRate = 10000;
 
 /**
  * Default max rate.
- * @const {Number}
+ * @const {Rate}
  * @default
  */
 
diff --git a/lib/bcoin/protocol/parser.js b/lib/bcoin/protocol/parser.js
index 90505bfd..c30927e7 100644
--- a/lib/bcoin/protocol/parser.js
+++ b/lib/bcoin/protocol/parser.js
@@ -1227,4 +1227,8 @@ Parser.parseAlert = function parseAlert(p) {
   };
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Parser;
diff --git a/lib/bcoin/reader.js b/lib/bcoin/reader.js
index 8de37004..25cdc9dd 100644
--- a/lib/bcoin/reader.js
+++ b/lib/bcoin/reader.js
@@ -545,4 +545,8 @@ BufferReader.prototype.verifyChecksum = function verifyChecksum() {
   return checksum;
 };
 
+/*
+ * Expose
+ */
+
 module.exports = BufferReader;
diff --git a/lib/bcoin/script.js b/lib/bcoin/script.js
index 730dff9f..bdbea5b1 100644
--- a/lib/bcoin/script.js
+++ b/lib/bcoin/script.js
@@ -4205,7 +4205,14 @@ Script.isScript = function isScript(obj) {
     && typeof obj.getSubscript === 'function';
 };
 
-Script.Witness = Witness;
-Script.Stack = Stack;
+/*
+ * Expose
+ */
 
-module.exports = Script;
+exports = Script;
+
+exports.Script = Script;
+exports.Witness = Witness;
+exports.Stack = Stack;
+
+module.exports = exports;
diff --git a/lib/bcoin/spvnode.js b/lib/bcoin/spvnode.js
index 43e49d38..75ab8b04 100644
--- a/lib/bcoin/spvnode.js
+++ b/lib/bcoin/spvnode.js
@@ -296,4 +296,8 @@ SPVNode.prototype.getWallet = function getWallet(id, passphrase, callback) {
   return this.walletdb.get(id, passphrase, callback);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = SPVNode;
diff --git a/lib/bcoin/timedata.js b/lib/bcoin/timedata.js
index 3514f714..fae2ce13 100644
--- a/lib/bcoin/timedata.js
+++ b/lib/bcoin/timedata.js
@@ -103,8 +103,16 @@ TimeData.prototype.now = function now() {
   return utils.now() + this.offset;
 };
 
+/*
+ * Helpers
+ */
+
 function compare(a, b) {
   return a - b;
 }
 
+/*
+ * Expose
+ */
+
 module.exports = TimeData;
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index f64b9b03..e0ec171c 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -660,7 +660,7 @@ TX.prototype.isCoinbase = function isCoinbase() {
 
 /**
  * Calculate the fee for the transaction.
- * @returns {BN} fee (zero if not all coins are available).
+ * @returns {Amount} fee (zero if not all coins are available).
  */
 
 TX.prototype.getFee = function getFee() {
@@ -672,7 +672,7 @@ TX.prototype.getFee = function getFee() {
 
 /**
  * Calculate the total input value.
- * @returns {BN} value
+ * @returns {Amount} value
  */
 
 TX.prototype.getInputValue = function getInputValue() {
@@ -696,7 +696,7 @@ TX.prototype.getInputValue = function getInputValue() {
 
 /**
  * Calculate the total output value.
- * @returns {BN} value
+ * @returns {Amount} value
  */
 
 TX.prototype.getOutputValue = function getOutputValue() {
@@ -1411,7 +1411,7 @@ TX.prototype.getModifiedSize = function getModifiedSize(size) {
  * @param {Number?} size - Size to calculate priority
  * based on. If not present, modified size will be
  * calculated and used.
- * @returns {BN} priority
+ * @returns {Number} priority
  */
 
 TX.prototype.getPriority = function getPriority(height, size) {
@@ -1485,8 +1485,8 @@ TX.prototype.isFree = function isFree(height, size) {
  * to be relayable (not the constant min relay fee).
  * @param {Number?} size - If not present, max size
  * estimation will be calculated and used.
- * @param {Number?} rate - Rate of satoshi per kB.
- * @returns {BN} fee
+ * @param {Rate?} rate - Rate of satoshi per kB.
+ * @returns {Amount} fee
  */
 
 TX.prototype.getMinFee = function getMinFee(size, rate) {
@@ -1499,8 +1499,8 @@ TX.prototype.getMinFee = function getMinFee(size, rate) {
 /**
  * Calculate minimum fee based on rate and size.
  * @param {Number?} size
- * @param {Number?} rate - Rate of satoshi per kB.
- * @returns {BN} fee
+ * @param {Rate?} rate - Rate of satoshi per kB.
+ * @returns {Amount} fee
  */
 
 TX.getMinFee = function getMinFee(size, rate) {
@@ -1523,8 +1523,8 @@ TX.getMinFee = function getMinFee(size, rate) {
  * when taking into account size.
  * @param {Number?} size - If not present, max size
  * estimation will be calculated and used.
- * @param {Number?} rate - Rate of satoshi per kB.
- * @returns {BN} fee
+ * @param {Rate?} rate - Rate of satoshi per kB.
+ * @returns {Amount} fee
  */
 
 TX.prototype.getMaxFee = function getMaxFee(size, rate) {
@@ -1917,4 +1917,9 @@ TX.isTX = function isTX(obj) {
     && typeof obj.getVirtualSize === 'function';
 };
 
+/*
+ * Expose
+ */
+
+
 module.exports = TX;
diff --git a/lib/bcoin/txdb.js b/lib/bcoin/txdb.js
index 8cb5a6ec..e10694a1 100644
--- a/lib/bcoin/txdb.js
+++ b/lib/bcoin/txdb.js
@@ -1735,4 +1735,8 @@ TXDB.prototype.zap = function zap(address, now, age, callback, force) {
   });
 };
 
+/*
+ * Expose
+ */
+
 module.exports = TXDB;
diff --git a/lib/bcoin/types.js b/lib/bcoin/types.js
index 2f39088d..17382deb 100644
--- a/lib/bcoin/types.js
+++ b/lib/bcoin/types.js
@@ -58,7 +58,7 @@
 /**
  * @typedef {Object} ParsedURI
  * @property {Base58Address} address
- * @property {BN?} amount? - Amount in satoshis.
+ * @property {Amount?} amount? - Amount in satoshis.
  * @property {String?} label
  * @property {String?} message
  * @property {String?} request - Payment request URL.
@@ -105,9 +105,25 @@
 /**
  * Wallet balance.
  * @typedef {Object} Balance
- * @property {BN} confirmed
- * @property {BN} unconfirmed
- * @property {BN} total
+ * @property {Amount} confirmed
+ * @property {Amount} unconfirmed
+ * @property {Amount} total
+ * @global
+ */
+
+/**
+ * A satoshi amount. This is technically a
+ * JS double float, but it is regularly
+ * enforced to be less than 53 bits and
+ * less than MAX_MONEY regularly in
+ * various functions.
+ * @typedef {Number} Amount
+ * @global
+ */
+
+/**
+ * Rate of satoshis per kB.
+ * @typedef {Amount} Rate
  * @global
  */
 
@@ -143,9 +159,9 @@
 /**
  * @typedef {Object} CoinSelection
  * @property {Coin[]?} chosen - Selected coins.
- * @property {BN} change - Amount of change to add.
- * @property {BN} fee - Estimated fee.
- * @property {BN} total - Total value.
+ * @property {Amount} change - Amount of change to add.
+ * @property {Amount} fee - Estimated fee.
+ * @property {Amount} total - Total value.
  * @global
  */
 
@@ -202,7 +218,7 @@
  * @typedef {Object} NakedCoin
  * @property {Number} version - Transaction version.
  * @property {Number} height - Transaction height (-1 if unconfirmed).
- * @property {BN} value - Output value in satoshis.
+ * @property {Amount} value - Output value in satoshis.
  * @property {Script} script - Output script.
  * @property {Boolean} coinbase - Whether the containing
  * transaction is a coinbase.
@@ -295,7 +311,7 @@
 
 /**
  * @typedef {Object} NakedOutput
- * @property {BN} value - Value in satoshis.
+ * @property {Amount} value - Value in satoshis.
  * @property {NakedScript} script - Output script.
  * @global
  */
@@ -304,7 +320,7 @@
  * @typedef {Object} NakedCoin
  * @property {Number} version - Transaction version.
  * @property {Number} height - Transaction height (-1 if unconfirmed).
- * @property {BN} value - Output value in satoshis.
+ * @property {Amount} value - Output value in satoshis.
  * @property {Script} script - Output script.
  * @property {Boolean} coinbase - Whether the containing
  * transaction is a coinbase.
diff --git a/lib/bcoin/uri.js b/lib/bcoin/uri.js
index 61edafe0..945f6551 100644
--- a/lib/bcoin/uri.js
+++ b/lib/bcoin/uri.js
@@ -52,7 +52,7 @@ exports.validate = function validate(uri) {
 /**
  * Encode data as a bitcoin URI.
  * @param {ParsedURI|Base58Address} data/address
- * @param {BN?} amount
+ * @param {Amount?} amount
  * @returns {String} URI
  * @throws when no address provided
  */
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 22473117..cb47a254 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -651,7 +651,7 @@ utils.assert.fatal = function fatal(value, message) {
  * Safely convert satoshis to a BTC string.
  * This function explicitly avoids any
  * floating point arithmetic.
- * @param {Number} value - Satoshis.
+ * @param {Amount} value - Satoshis.
  * @returns {String} BTC string.
  */
 
@@ -701,7 +701,7 @@ utils.btc = function btc(value) {
  * extra validation to ensure the resulting
  * Number will be 53 bits or less.
  * @param {String} value - BTC
- * @returns {Number} Satoshis.
+ * @returns {Amount} Satoshis.
  * @throws on parse error
  */
 
@@ -777,7 +777,7 @@ utils.isFloat = function isFloat(value) {
 
 /**
  * Test whether an object is a finite number and int.
- * @param {BN?} value
+ * @param {Number?} value
  * @returns {Boolean}
  */
 
@@ -1272,16 +1272,14 @@ utils.time = function time(date) {
 
 /**
  * UINT32_MAX
- * @type BN
- * @const
+ * @const {BN}
  */
 
 utils.U32 = new bn(0xffffffff);
 
 /**
  * UINT64_MAX
- * @type BN
- * @const
+ * @const {BN}
  */
 
 utils.U64 = new bn('ffffffffffffffff', 'hex');
@@ -1640,17 +1638,15 @@ utils.writeU64NBE = function writeU64NBE(dst, num, off) {
 
 /**
  * Max safe integer (53 bits).
- * @type Number
- * @const
+ * @const {Number}
  */
 
 utils.MAX_SAFE_INTEGER = 0x1fffffffffffff;
 
 /**
  * Max 52 bit integer (safe for additions).
- * (MAX_SAFE_INTEGER - 1) / 2
- * @type Number
- * @const
+ * `(MAX_SAFE_INTEGER - 1) / 2`
+ * @const {Number}
  */
 
 utils.MAX_SAFE_ADDITION = 0xfffffffffffff;
diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 55294b71..35a07517 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -679,10 +679,11 @@ Wallet.prototype.ownOutput = function ownOutput(tx, index) {
  * @param {Boolean} options.accurate - Whether to use "accurate"
  * fee calculatation rather than rounding to the nearest kilobyte.
  * See {@link TX#getMinFee} vs. {@link TX#getMaxFee}.
+ * @param {Rate} options.rate - Rate used for fee calculation.
  * @param {Boolean} options.confirmed - Select only confirmed coins.
  * @param {Boolean} options.free - Do not apply a fee if the
  * transaction priority is high enough to be considered free.
- * @param {BN?} options.fee - Use a hard fee rather than calculating one.
+ * @param {Amount?} options.fee - Use a hard fee rather than calculating one.
  * @param {Number|Boolean} options.subtractFee - Whether to subtract the
  * fee from existing outputs rather than adding more inputs.
  */
@@ -1778,4 +1779,8 @@ Wallet.isWallet = function isWallet(obj) {
     && obj.deriveAddress === 'function';
 };
 
+/*
+ * Expose
+ */
+
 module.exports = Wallet;
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index 874dce51..08b8a409 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -1169,6 +1169,12 @@ Provider.prototype.zap = function zap(now, age, callback) {
   return this.db.zapWallet(this.id, now, age, callback);
 };
 
-WalletDB.Provider = Provider;
+/*
+ * Expose
+ */
 
-module.exports = WalletDB;
+exports = WalletDB;
+
+exports.Provider = Provider;
+
+module.exports = exports;
diff --git a/lib/bcoin/workers.js b/lib/bcoin/workers.js
index 14405899..84c793c7 100644
--- a/lib/bcoin/workers.js
+++ b/lib/bcoin/workers.js
@@ -882,10 +882,17 @@ function getCores() {
   return os.cpus().length;
 }
 
-Workers.Worker = Worker;
-Workers.Master = Master;
-Workers.Framer = Framer;
-Workers.Parser = Parser;
-Workers.listen = Master.listen;
+/*
+ * Expose
+ */
 
-module.exports = Workers;
+exports = Workers;
+
+exports.Workers = Workers;
+exports.Worker = Worker;
+exports.Master = Master;
+exports.Framer = Framer;
+exports.Parser = Parser;
+exports.listen = Master.listen;
+
+module.exports = exports;
diff --git a/lib/bcoin/writer.js b/lib/bcoin/writer.js
index 22284658..05b552c8 100644
--- a/lib/bcoin/writer.js
+++ b/lib/bcoin/writer.js
@@ -350,4 +350,8 @@ BufferWriter.prototype.fill = function fill(value, size) {
   this.data.push(['bytes', buf]);
 };
 
+/*
+ * Expose
+ */
+
 module.exports = BufferWriter;