diff --git a/src/RPCServer.cpp b/src/RPCServer.cpp
index 969fc7ab9e..cbc87357ce 100644
--- a/src/RPCServer.cpp
+++ b/src/RPCServer.cpp
@@ -244,7 +244,7 @@ Json::Value RPCServer::doAccountInfo(Json::Value &params)
 		return "invalid params";
 	}
 	else if (!theApp->getOPs().available()) {
-		return "network not available";
+		return JSONRPCError(503, "network not available");
 	}
 	else
 	{
@@ -363,6 +363,104 @@ Json::Value RPCServer::doPeers(Json::Value& params)
 	return theApp->getConnectionPool().getPeersJson();
 }
 
+// credit_set <seed> <paying_account> <destination_account> <limit_amount> <currency> [<borrow_rate>] [<borrow_start>] [<borrow_expire>]
+Json::Value RPCServer::doCreditSet(Json::Value& params)
+{
+	NewcoinAddress	naSeed;
+	NewcoinAddress	naSrcAccountID;
+	NewcoinAddress	naDstAccountID;
+	STAmount		saLimitAmount;
+	std::string		sBorrowRate;
+	std::string		sBorrowStart;
+	std::string		sBorrowExpire;
+	uint32			uBorrowRate;
+	uint32			uBorrowStart;
+	uint32			uBorrowExpire;
+
+	if (params.size() >= 6)
+		sBorrowRate		= params[6u].asString();
+
+	if (params.size() >= 7)
+		sBorrowStart	= params[7u].asString();
+
+	if (params.size() >= 8)
+		sBorrowExpire	= params[8u].asString();
+
+	if (params.size() < 5 || params.size() > 8)
+	{
+		return JSONRPCError(500, "invalid parameters");
+	}
+	else if (!naSeed.setFamilySeedGeneric(params[0u].asString()))
+	{
+		return JSONRPCError(500, "disallowed seed");
+	}
+	else if (!naSrcAccountID.setAccountID(params[1u].asString()))
+	{
+		return JSONRPCError(500, "source account id needed");
+	}
+	else if (!naDstAccountID.setAccountID(params[2u].asString()))
+	{
+		return JSONRPCError(500, "destination account id needed");
+	}
+	else if (!saLimitAmount.setValue(params[5u].asString(), params[6u].asString()))
+	{
+		return JSONRPCError(500, "bad src amount/currency");
+	}
+	else if (!theApp->getOPs().available()) {
+		return JSONRPCError(503, "network not available");
+	}
+	else
+	{
+		NewcoinAddress					naAccountPublic;
+		NewcoinAddress					naAccountPrivate;
+	    SerializedLedgerEntry::pointer	sleSrc;
+		Json::Value						obj				= authorize(naSeed, naSrcAccountID, naAccountPublic, naAccountPrivate, sleSrc);
+
+		if (!obj.empty())
+		{
+			return obj;
+		}
+
+		STAmount						saSrcBalance	= sleSrc->getIValueFieldAmount(sfBalance);
+
+		uBorrowRate			= 0;
+		uBorrowStart		= 0;
+		uBorrowExpire		= 0;
+
+		if (saSrcBalance < theConfig.FEE_DEFAULT)
+		{
+			return JSONRPCError(500, "insufficent funds");
+		}
+		else
+		{
+			Transaction::pointer	trans	= Transaction::sharedCreditSet(
+				naAccountPublic, naAccountPrivate,
+				naSrcAccountID,
+				sleSrc->getIFieldU32(sfSequence),
+				theConfig.FEE_DEFAULT,
+				0,											// YYY No source tag
+				naDstAccountID,
+				saLimitAmount,
+				uBorrowRate,
+				uBorrowStart,
+				uBorrowExpire);
+
+			(void) theApp->getOPs().processTransaction(trans);
+
+			obj["transaction"]		= trans->getSTransaction()->getJson(0);
+			obj["status"]			= trans->getStatus();
+			obj["seed"]				= naSeed.humanFamilySeed();
+			obj["srcAccountID"]		= naSrcAccountID.humanAccountID();
+			obj["dstAccountID"]		= naDstAccountID.humanAccountID();
+			obj["limitAmount"]		= saLimitAmount.getText();
+			obj["borrowRate"]		= uBorrowRate;
+			obj["borrowStart"]		= uBorrowStart;
+			obj["borrowExpire"]		= uBorrowExpire;
+
+			return obj;
+		}
+	}
+}
 
 // send regular_seed paying_account account_id amount [currency] [send_max] [send_currency]
 Json::Value RPCServer::doSend(Json::Value& params)
@@ -406,7 +504,7 @@ Json::Value RPCServer::doSend(Json::Value& params)
 		return JSONRPCError(500, "bad src amount/currency");
 	}
 	else if (!theApp->getOPs().available()) {
-		return "network not available";
+		return JSONRPCError(503, "network not available");
 	}
 	else
 	{
@@ -423,6 +521,8 @@ Json::Value RPCServer::doSend(Json::Value& params)
 		if (params.size() < 6)
 			saSrcAmount	= saDstAmount;
 
+		// XXX Confirm saSrcAmount >= saDstAmount.
+
 		STAmount						saSrcBalance	= sleSrc->getIValueFieldAmount(sfBalance);
 
 		if (saSrcBalance < theConfig.FEE_DEFAULT)
@@ -460,6 +560,92 @@ Json::Value RPCServer::doSend(Json::Value& params)
 	}
 }
 
+// transit_set <seed> <paying_account> <transit_rate> <starts> <expires>
+Json::Value RPCServer::doTransitSet(Json::Value& params)
+{
+	NewcoinAddress	naSeed;
+	NewcoinAddress	naSrcAccountID;
+	std::string		sTransitRate;
+	std::string		sTransitStart;
+	std::string		sTransitExpire;
+	uint32			uTransitRate;
+	uint32			uTransitStart;
+	uint32			uTransitExpire;
+
+	if (params.size() >= 6)
+		sTransitRate		= params[6u].asString();
+
+	if (params.size() >= 7)
+		sTransitStart	= params[7u].asString();
+
+	if (params.size() >= 8)
+		sTransitExpire	= params[8u].asString();
+
+	if (params.size() != 5)
+	{
+		return JSONRPCError(500, "invalid parameters");
+	}
+	else if (!naSeed.setFamilySeedGeneric(params[0u].asString()))
+	{
+		return JSONRPCError(500, "disallowed seed");
+	}
+	else if (!naSrcAccountID.setAccountID(params[1u].asString()))
+	{
+		return JSONRPCError(500, "source account id needed");
+	}
+	else if (!theApp->getOPs().available()) {
+		return JSONRPCError(503, "network not available");
+	}
+	else
+	{
+		NewcoinAddress					naAccountPublic;
+		NewcoinAddress					naAccountPrivate;
+	    SerializedLedgerEntry::pointer	sleSrc;
+		Json::Value						obj				= authorize(naSeed, naSrcAccountID, naAccountPublic, naAccountPrivate, sleSrc);
+
+		if (!obj.empty())
+		{
+			return obj;
+		}
+
+		STAmount						saSrcBalance	= sleSrc->getIValueFieldAmount(sfBalance);
+
+		uTransitRate		= 0;
+		uTransitStart		= 0;
+		uTransitExpire		= 0;
+
+		if (saSrcBalance < theConfig.FEE_DEFAULT)
+		{
+			return JSONRPCError(500, "insufficent funds");
+		}
+		else
+		{
+			Transaction::pointer	trans	= Transaction::sharedTransitSet(
+				naAccountPublic, naAccountPrivate,
+				naSrcAccountID,
+				sleSrc->getIFieldU32(sfSequence),
+				theConfig.FEE_DEFAULT,
+				0,											// YYY No source tag
+				uTransitRate,
+				uTransitStart,
+				uTransitExpire);
+
+			(void) theApp->getOPs().processTransaction(trans);
+
+			obj["transaction"]		= trans->getSTransaction()->getJson(0);
+			obj["status"]			= trans->getStatus();
+			obj["seed"]				= naSeed.humanFamilySeed();
+			obj["srcAccountID"]		= naSrcAccountID.humanAccountID();
+			obj["transitRate"]		= uTransitRate;
+			obj["transitStart"]		= uTransitStart;
+			obj["transitExpire"]	= uTransitExpire;
+
+			return obj;
+		}
+	}
+	return "Not implemented.";
+}
+
 Json::Value RPCServer::doTx(Json::Value& params)
 {
 	// tx
@@ -720,7 +906,7 @@ Json::Value RPCServer::doWalletCreate(Json::Value& params)
 	}
 	else if (!theApp->getOPs().available()) {
 		// We require access to the paying account's sequence number and key information.
-		return "network not available";
+		return JSONRPCError(503, "network not available");
 	}
 	else if (theApp->getMasterLedger().getCurrentLedger()->getAccountState(naDstAccountID))
 	{
@@ -965,29 +1151,30 @@ Json::Value RPCServer::doCommand(const std::string& command, Json::Value& params
 {
 	std::cerr << "RPC:" << command << std::endl;
 
-	if (command == "account_info")		return doAccountInfo(params);
-	if (command == "connect")			return doConnect(params);
-	if (command == "peers")				return doPeers(params);
+	if (command == "account_info")			return doAccountInfo(params);
+	if (command == "connect")				return doConnect(params);
+	if (command == "credit_set")			return doCreditSet(params);
+	if (command == "peers")					return doPeers(params);
+	if (command == "send")					return doSend(params);
+	if (command == "stop")					return doStop(params);
+	if (command == "transit_set")			return doTransitSet(params);
 
-	if (command == "send")				return doSend(params);
-	if (command == "stop")				return doStop(params);
+	if (command == "unl_add")				return doUnlAdd(params);
+	if (command == "unl_default")			return doUnlDefault(params);
+	if (command == "unl_delete")			return doUnlDelete(params);
+	if (command == "unl_list")				return doUnlList(params);
+	if (command == "unl_reset")				return doUnlReset(params);
+	if (command == "unl_score")				return doUnlScore(params);
 
-	if (command == "unl_add")			return doUnlAdd(params);
-	if (command == "unl_default")		return doUnlDefault(params);
-	if (command == "unl_delete")		return doUnlDelete(params);
-	if (command == "unl_list")			return doUnlList(params);
-	if (command == "unl_reset")			return doUnlReset(params);
-	if (command == "unl_score")			return doUnlScore(params);
+	if (command == "validation_create")		return doValidatorCreate(params);
 
-	if (command == "validation_create")	return doValidatorCreate(params);
-
-	if (command == "wallet_accounts")	return doWalletAccounts(params);
-	if (command == "wallet_add")		return doWalletAdd(params);
-	if (command == "wallet_claim")		return doWalletClaim(params);
-	if (command == "wallet_create")		return doWalletCreate(params);
-	if (command == "wallet_propose")	return doWalletPropose(params);
-	if (command == "wallet_seed")		return doWalletSeed(params);
-	if (command == "wallet_verify")		return doWalletVerify(params);
+	if (command == "wallet_accounts")		return doWalletAccounts(params);
+	if (command == "wallet_add")			return doWalletAdd(params);
+	if (command == "wallet_claim")			return doWalletClaim(params);
+	if (command == "wallet_create")			return doWalletCreate(params);
+	if (command == "wallet_propose")		return doWalletPropose(params);
+	if (command == "wallet_seed")			return doWalletSeed(params);
+	if (command == "wallet_verify")			return doWalletVerify(params);
 
 	//
 	// Obsolete or need rewrite:
diff --git a/src/RPCServer.h b/src/RPCServer.h
index 03c4e011da..56458321ab 100644
--- a/src/RPCServer.h
+++ b/src/RPCServer.h
@@ -37,13 +37,16 @@ class RPCServer  : public boost::enable_shared_from_this<RPCServer>
 	    SerializedLedgerEntry::pointer& sleSrc);
 
 	Json::Value doAccountInfo(Json::Value& params);
+	Json::Value doBorrowSet(Json::Value& params);
 	Json::Value doConnect(Json::Value& params);
+	Json::Value doCreditSet(Json::Value& params);
 	Json::Value doLedger(Json::Value& params);
 	Json::Value doPeers(Json::Value& params);
 	Json::Value doSend(Json::Value& params);
 	Json::Value doSessionClose(Json::Value& params);
 	Json::Value doSessionOpen(Json::Value& params);
 	Json::Value doStop(Json::Value& params);
+	Json::Value doTransitSet(Json::Value& params);
 	Json::Value doTx(Json::Value& params);
 
 	Json::Value doUnlAdd(Json::Value& params);
diff --git a/src/SerializedObject.h b/src/SerializedObject.h
index 60f8c3c75c..d321b6870b 100644
--- a/src/SerializedObject.h
+++ b/src/SerializedObject.h
@@ -31,6 +31,9 @@ enum SOE_Field
 	sfAmountOut,
 	sfAuthorizedKey,
 	sfBalance,
+	sfBorrowExpire,
+	sfBorrowRate,
+	sfBorrowStart,
 	sfBorrower,
 	sfCurrency,
 	sfCurrencyIn,
@@ -50,6 +53,7 @@ enum SOE_Field
 	sfLedgerHash,
 	sfLender,
 	sfLimit,
+	sfLimitAmount,
 	sfMessageKey,
 	sfMinimumOffer,
 	sfNextRate,
@@ -67,6 +71,9 @@ enum SOE_Field
 	sfSourceTag,
 	sfTarget,
 	sfTargetLedger,
+	sfTransitExpire,
+	sfTransitRate,
+	sfTransitStart,
 	sfWalletLocator,
 
 	// test fields
diff --git a/src/Transaction.cpp b/src/Transaction.cpp
index d60939eb5b..5872fdbf27 100644
--- a/src/Transaction.cpp
+++ b/src/Transaction.cpp
@@ -155,11 +155,11 @@ Transaction::pointer Transaction::sharedClaim(
 Transaction::pointer Transaction::setCreate(
 	const NewcoinAddress&	naPrivateKey,
 	const NewcoinAddress&	naCreateAccountID,
-	const STAmount&			uFund)
+	const STAmount&			saFund)
 {
 	mTransaction->setITFieldU32(sfFlags, tfCreateAccount);
 	mTransaction->setITFieldAccount(sfDestination, naCreateAccountID);
-	mTransaction->setITFieldAmount(sfAmount, uFund);
+	mTransaction->setITFieldAmount(sfAmount, saFund);
 
 	sign(naPrivateKey);
 
@@ -173,13 +173,58 @@ Transaction::pointer Transaction::sharedCreate(
 	const STAmount&			saFee,
 	uint32					uSourceTag,
 	const NewcoinAddress&	naCreateAccountID,
-	const STAmount&			uFund)
+	const STAmount&			saFund)
 {
 	pointer	tResult	= boost::make_shared<Transaction>(ttPAYMENT,
 						naPublicKey, naSourceAccount,
 						uSeq, saFee, uSourceTag);
 
-	return tResult->setCreate(naPrivateKey, naCreateAccountID, uFund);
+	return tResult->setCreate(naPrivateKey, naCreateAccountID, saFund);
+}
+
+//
+// CreditSet
+//
+
+Transaction::pointer Transaction::setCreditSet(
+	const NewcoinAddress&	naPrivateKey,
+	const NewcoinAddress&	naDstAccountID,
+	const STAmount&			saLimitAmount,
+	uint32					uBorrowRate,
+	uint32					uBorrowStart,
+	uint32					uBorrowExpire)
+{
+	mTransaction->setITFieldAccount(sfDestination, naDstAccountID);
+	mTransaction->setITFieldAmount(sfLimitAmount, saLimitAmount);
+	if (uBorrowRate)
+		mTransaction->setITFieldU32(sfBorrowRate, uBorrowRate);
+	if (uBorrowStart)
+		mTransaction->setITFieldU32(sfBorrowStart, uBorrowStart);
+	if (uBorrowExpire)
+		mTransaction->setITFieldU32(sfBorrowExpire, uBorrowExpire);
+
+	sign(naPrivateKey);
+
+	return shared_from_this();
+}
+
+Transaction::pointer Transaction::sharedCreditSet(
+	const NewcoinAddress& naPublicKey, const NewcoinAddress& naPrivateKey,
+	const NewcoinAddress&	naSourceAccount,
+	uint32					uSeq,
+	const STAmount&			saFee,
+	uint32					uSourceTag,
+	const NewcoinAddress&	naDstAccountID,
+	const STAmount&			saLimitAmount,
+	uint32					uBorrowRate,
+	uint32					uBorrowStart,
+	uint32					uBorrowExpire)
+{
+	pointer	tResult	= boost::make_shared<Transaction>(ttCREDIT_SET,
+						naPublicKey, naSourceAccount,
+						uSeq, saFee, uSourceTag);
+
+	return tResult->setCreditSet(naPrivateKey, naDstAccountID, saLimitAmount, uBorrowRate, uBorrowStart, uBorrowExpire);
 }
 
 //
@@ -188,12 +233,12 @@ Transaction::pointer Transaction::sharedCreate(
 
 Transaction::pointer Transaction::setPayment(
 	const NewcoinAddress&	naPrivateKey,
-	const NewcoinAddress&	toAccount,
+	const NewcoinAddress&	naDstAccountID,
 	const STAmount&			saAmount,
 	const STAmount&			saSendMax,
 	const STPathSet&		spPaths)
 {
-	mTransaction->setITFieldAccount(sfDestination, toAccount);
+	mTransaction->setITFieldAccount(sfDestination, naDstAccountID);
 	mTransaction->setITFieldAmount(sfAmount, saAmount);
 
 	if (saAmount != saSendMax)
@@ -217,7 +262,7 @@ Transaction::pointer Transaction::sharedPayment(
 	uint32					uSeq,
 	const STAmount&			saFee,
 	uint32					uSourceTag,
-	const NewcoinAddress&	toAccount,
+	const NewcoinAddress&	naDstAccountID,
 	const STAmount&			saAmount,
 	const STAmount&			saSendMax,
 	const STPathSet&		saPaths)
@@ -226,7 +271,46 @@ Transaction::pointer Transaction::sharedPayment(
 						naPublicKey, naSourceAccount,
 						uSeq, saFee, uSourceTag);
 
-	return tResult->setPayment(naPrivateKey, toAccount, saAmount, saSendMax, saPaths);
+	return tResult->setPayment(naPrivateKey, naDstAccountID, saAmount, saSendMax, saPaths);
+}
+
+//
+// TransitSet
+//
+
+Transaction::pointer Transaction::setTransitSet(
+	const NewcoinAddress&	naPrivateKey,
+	uint32					uTransitRate,
+	uint32					uTransitStart,
+	uint32					uTransitExpire)
+{
+	if (uTransitRate)
+		mTransaction->setITFieldU32(sfTransitRate, uTransitRate);
+	if (uTransitStart)
+		mTransaction->setITFieldU32(sfTransitStart, uTransitStart);
+	if (uTransitExpire)
+		mTransaction->setITFieldU32(sfTransitExpire, uTransitExpire);
+
+	sign(naPrivateKey);
+
+	return shared_from_this();
+}
+
+Transaction::pointer Transaction::sharedTransitSet(
+	const NewcoinAddress& naPublicKey, const NewcoinAddress& naPrivateKey,
+	const NewcoinAddress&	naSourceAccount,
+	uint32					uSeq,
+	const STAmount&			saFee,
+	uint32					uSourceTag,
+	uint32					uTransitRate,
+	uint32					uTransitStart,
+	uint32					uTransitExpire)
+{
+	pointer	tResult	= boost::make_shared<Transaction>(ttTRANSIT_SET,
+						naPublicKey, naSourceAccount,
+						uSeq, saFee, uSourceTag);
+
+	return tResult->setTransitSet(naPrivateKey, uTransitRate, uTransitStart, uTransitExpire);
 }
 
 //
diff --git a/src/Transaction.h b/src/Transaction.h
index 475f5faac4..e148270468 100644
--- a/src/Transaction.h
+++ b/src/Transaction.h
@@ -55,15 +55,29 @@ private:
 	Transaction::pointer setCreate(
 		const NewcoinAddress&	naPrivateKey,
 		const NewcoinAddress&	naCreateAccountID,
-		const STAmount&			uFund);
+		const STAmount&			saFund);
+
+	Transaction::pointer setCreditSet(
+		const NewcoinAddress&	naPrivateKey,
+		const NewcoinAddress&	naDstAccountID,
+		const STAmount&			saLimitAmount,
+		uint32					uBorrowRate,
+		uint32					uBorrowStart,
+		uint32					uBorrowExpire);
 
 	Transaction::pointer setPayment(
 		const NewcoinAddress&	naPrivateKey,
-		const NewcoinAddress&	toAccount,
+		const NewcoinAddress&	naDstAccountID,
 		const STAmount&			saAmount,
 		const STAmount&			saSendMax,
 		const STPathSet&		spPaths);
 
+	Transaction::pointer setTransitSet(
+		const NewcoinAddress&	naPrivateKey,
+		uint32					uTransitRate,
+		uint32					uTransitStart,
+		uint32					uTransitExpire);
+
 public:
 	Transaction(const SerializedTransaction::pointer st, bool bValidate);
 
@@ -94,7 +108,20 @@ public:
 		const STAmount&			saFee,
 		uint32					uSourceTag,
 		const NewcoinAddress&	naCreateAccountID,	// Account to create.
-		const STAmount&			uFund);				// Initial funds in XNC.
+		const STAmount&			saFund);			// Initial funds in XNC.
+
+	// Set credit limit and borrow fees.
+	static Transaction::pointer sharedCreditSet(
+		const NewcoinAddress& naPublicKey, const NewcoinAddress& naPrivateKey,
+		const NewcoinAddress&	naSourceAccount,
+		uint32					uSeq,
+		const STAmount&			saFee,
+		uint32					uSourceTag,
+		const NewcoinAddress&	naDstAccountID,
+		const STAmount&			saLimitAmount,
+		uint32					uBorrowRate,
+		uint32					uBorrowStart,
+		uint32					uBorrowExpire);
 
 	// Make a payment.
 	static Transaction::pointer sharedPayment(
@@ -103,11 +130,22 @@ public:
 		uint32					uSeq,
 		const STAmount&			saFee,
 		uint32					uSourceTag,
-		const NewcoinAddress&	toAccount,
+		const NewcoinAddress&	naDstAccountID,
 		const STAmount&			saAmount,
 		const STAmount&			saSendMax,
 		const STPathSet&		saPaths);
 
+	// Set transit fees.
+	static Transaction::pointer sharedTransitSet(
+		const NewcoinAddress& naPublicKey, const NewcoinAddress& naPrivateKey,
+		const NewcoinAddress&	naSourceAccount,
+		uint32					uSeq,
+		const STAmount&			saFee,
+		uint32					uSourceTag,
+		uint32					uTransitRate,
+		uint32					uTransitStart,
+		uint32					uTransitExpire);
+
 	bool sign(const NewcoinAddress& naAccountPrivate);
 	bool checkSign() const;
 	void updateID() { mTransactionID=mTransaction->getTransactionID(); }
diff --git a/src/TransactionEngine.cpp b/src/TransactionEngine.cpp
index ffb7f72389..432fcc3bec 100644
--- a/src/TransactionEngine.cpp
+++ b/src/TransactionEngine.cpp
@@ -52,7 +52,7 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 			break;
 
 		case ttINVOICE:
-		case ttEXCHANGE_OFFER:
+		case ttOFFER:
 			result = terSUCCESS;
 			break;
 
@@ -171,27 +171,35 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 
 	switch(txn.getTxnType())
 	{
-		case ttINVALID:
-			std::cerr << "applyTransaction: invalid type" << std::endl;
-			result = tenINVALID;
-			break;
-
 		case ttCLAIM:
 			result = doClaim(txn, accounts);
 			break;
 
-		case ttPAYMENT:
-			result = doPayment(txn, accounts, srcAccountID);
+		case ttCREDIT_SET:
+			result = doCreditSet(txn, accounts);
+			break;
+
+		case ttINVALID:
+			std::cerr << "applyTransaction: invalid type" << std::endl;
+			result = tenINVALID;
 			break;
 
 		case ttINVOICE:
 			result = doInvoice(txn, accounts);
 			break;
 
-		case ttEXCHANGE_OFFER:
+		case ttOFFER:
 			result = doOffer(txn, accounts);
 			break;
 
+		case ttPAYMENT:
+			result = doPayment(txn, accounts, srcAccountID);
+			break;
+
+		case ttTRANSIT_SET:
+			result = doTransitSet(txn, accounts);
+			break;
+
 		default:
 			result = tenUNKNOWN;
 			break;
@@ -228,6 +236,11 @@ TransactionEngineResult TransactionEngine::applyTransaction(const SerializedTran
 	return result;
 }
 
+TransactionEngineResult TransactionEngine::doCreditSet(const SerializedTransaction&, std::vector<AffectedAccount>&)
+{
+	return tenINVALID;
+}
+
 TransactionEngineResult TransactionEngine::doClaim(const SerializedTransaction& txn,
 	 std::vector<AffectedAccount>& accounts)
 {
@@ -412,6 +425,11 @@ TransactionEngineResult TransactionEngine::doPayment(const SerializedTransaction
 	return terSUCCESS;
 }
 
+TransactionEngineResult TransactionEngine::doTransitSet(const SerializedTransaction&, std::vector<AffectedAccount>&)
+{
+	return tenINVALID;
+}
+
 TransactionEngineResult TransactionEngine::doInvoice(const SerializedTransaction& txn,
 	std::vector<AffectedAccount>& accounts)
 {
@@ -447,4 +465,5 @@ TransactionEngineResult TransactionEngine::doDelete(const SerializedTransaction&
 {
 	return tenUNKNOWN;
 }
+
 // vim:ts=4
diff --git a/src/TransactionEngine.h b/src/TransactionEngine.h
index c10c680230..c05ecee86d 100644
--- a/src/TransactionEngine.h
+++ b/src/TransactionEngine.h
@@ -67,6 +67,7 @@ class TransactionEngine
 protected:
 	Ledger::pointer mLedger;
 
+	TransactionEngineResult doCreditSet(const SerializedTransaction&, std::vector<AffectedAccount>&);
 	TransactionEngineResult doCancel(const SerializedTransaction&, std::vector<AffectedAccount>&);
 	TransactionEngineResult doClaim(const SerializedTransaction&, std::vector<AffectedAccount>&);
 	TransactionEngineResult doDelete(const SerializedTransaction&, std::vector<AffectedAccount>&);
@@ -76,6 +77,7 @@ protected:
 								uint160 srcAccountID);
 	TransactionEngineResult doStore(const SerializedTransaction&, std::vector<AffectedAccount>&);
 	TransactionEngineResult doTake(const SerializedTransaction&, std::vector<AffectedAccount>&);
+	TransactionEngineResult doTransitSet(const SerializedTransaction&, std::vector<AffectedAccount>&);
 
 public:
 	TransactionEngine() { ; }
diff --git a/src/TransactionFormats.cpp b/src/TransactionFormats.cpp
index 06f833ea29..42af4a4c12 100644
--- a/src/TransactionFormats.cpp
+++ b/src/TransactionFormats.cpp
@@ -5,17 +5,6 @@
 
 TransactionFormat InnerTxnFormats[]=
 {
-	{ "Payment", ttPAYMENT, {
-		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
-		{ S_FIELD(Destination),  STI_ACCOUNT, SOE_REQUIRED, 0 },
-		{ S_FIELD(Amount),       STI_AMOUNT,  SOE_REQUIRED, 0 },
-		{ S_FIELD(SendMax),		 STI_AMOUNT,  SOE_IFFLAG,   1 },
-		{ S_FIELD(Paths),		 STI_PATHSET, SOE_IFFLAG,   2 },
-		{ S_FIELD(SourceTag),    STI_UINT32,  SOE_IFFLAG,   4 },
-		{ S_FIELD(InvoiceID),    STI_HASH256, SOE_IFFLAG,   8 },
-		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
-		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
-	},
 	{ "Claim", ttCLAIM, {
 		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
 		{ S_FIELD(Generator),    STI_VL,      SOE_REQUIRED, 0 },
@@ -25,6 +14,17 @@ TransactionFormat InnerTxnFormats[]=
 		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
 		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
 	},
+	{ "CreditSet", ttCREDIT_SET, {
+		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
+		{ S_FIELD(Destination),  STI_ACCOUNT, SOE_REQUIRED, 0 },
+		{ S_FIELD(LimitAmount),  STI_AMOUNT,  SOE_REQUIRED, 0 },
+		{ S_FIELD(BorrowRate),	 STI_UINT32,  SOE_IFFLAG,   1 },
+		{ S_FIELD(BorrowStart),	 STI_UINT32,  SOE_IFFLAG,   2 },
+		{ S_FIELD(BorrowExpire), STI_UINT32,  SOE_IFFLAG,   4 },
+		{ S_FIELD(SourceTag),    STI_UINT32,  SOE_IFFLAG,   8 },
+		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
+		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
+	},
 	{ "Invoice", ttINVOICE, {
 		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
 		{ S_FIELD(Target),       STI_ACCOUNT, SOE_REQUIRED, 0 },
@@ -36,7 +36,7 @@ TransactionFormat InnerTxnFormats[]=
 		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
 		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
 	},
-	{ "Offer", ttEXCHANGE_OFFER, {
+	{ "Offer", ttOFFER, {
 		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
 		{ S_FIELD(AmountIn),     STI_AMOUNT,  SOE_REQUIRED, 0 },
 		{ S_FIELD(CurrencyIn),   STI_HASH160, SOE_IFFLAG,   2 },
@@ -49,6 +49,26 @@ TransactionFormat InnerTxnFormats[]=
 		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
 		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
 	},
+	{ "Payment", ttPAYMENT, {
+		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
+		{ S_FIELD(Destination),  STI_ACCOUNT, SOE_REQUIRED, 0 },
+		{ S_FIELD(Amount),       STI_AMOUNT,  SOE_REQUIRED, 0 },
+		{ S_FIELD(SendMax),		 STI_AMOUNT,  SOE_IFFLAG,   1 },
+		{ S_FIELD(Paths),		 STI_PATHSET, SOE_IFFLAG,   2 },
+		{ S_FIELD(SourceTag),    STI_UINT32,  SOE_IFFLAG,   4 },
+		{ S_FIELD(InvoiceID),    STI_HASH256, SOE_IFFLAG,   8 },
+		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
+		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
+	},
+	{ "TransitSet", ttTRANSIT_SET, {
+		{ S_FIELD(Flags),        STI_UINT32,  SOE_FLAGS,    0 },
+		{ S_FIELD(TransitRate),	 STI_UINT32,  SOE_IFFLAG,	1 },
+		{ S_FIELD(TransitStart), STI_UINT32,  SOE_IFFLAG,   2 },
+		{ S_FIELD(TransitExpire),STI_UINT32,  SOE_IFFLAG,   4 },
+		{ S_FIELD(SourceTag),    STI_UINT32,  SOE_IFFLAG,   8 },
+		{ S_FIELD(Extensions),   STI_TL,      SOE_IFFLAG,   0x02000000 },
+		{ sfInvalid, NULL,       STI_DONE,    SOE_NEVER,    -1 } }
+	},
 	{ NULL, ttINVALID }
 };
 
diff --git a/src/TransactionFormats.h b/src/TransactionFormats.h
index fc1d70d944..95a4c01dca 100644
--- a/src/TransactionFormats.h
+++ b/src/TransactionFormats.h
@@ -9,7 +9,9 @@ enum TransactionType
 	ttPAYMENT			= 0,
 	ttCLAIM				= 1,
 	ttINVOICE			= 2,
-	ttEXCHANGE_OFFER	= 3
+	ttOFFER				= 3,
+	ttCREDIT_SET		= 20,
+	ttTRANSIT_SET		= 21,
 };
 
 struct TransactionFormat
@@ -28,8 +30,8 @@ const int TransactionISequence		= 3;
 const int TransactionIType			= 4;
 const int TransactionIFee			= 5;
 
-const int TransactionMinLen=32;
-const int TransactionMaxLen=1048576;
+const int TransactionMinLen			= 32;
+const int TransactionMaxLen			= 1048576;
 
 // Transaction flags.
 const uint32 tfCreateAccount		= 0x00010000;
diff --git a/src/main.cpp b/src/main.cpp
index e0e3938d72..8c8177cec5 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -40,10 +40,12 @@ void printHelp(const po::options_description& desc)
 	cout << "     account_info <account>|<nickname>" << endl;
 	cout << "     account_info <seed>|<pass_phrase>|<key> [<index>]" << endl;
 	cout << "     connect <ip> [<port>]" << endl;
+	cout << "     credit_set <seed> <paying_account> <destination_account> <limit_amount> <currency> [<borrow_rate>] [<borrow_start>] [<borrow_expire>]" << endl;
 	cout << "     ledger" << endl;
 	cout << "     peers" << endl;
-	cout << "     send <regular_seed> <paying_account> <account_id> <amount> [<currency>] [<send_max>] [<send_currency>]" << endl;
+	cout << "     send <seed> <paying_account> <account_id> <amount> [<currency>] [<send_max>] [<send_currency>]" << endl;
 	cout << "     stop" << endl;
+	cout << "     transit_set <seed> <paying_account> <transit_rate> <starts> <expires>" << endl;
 	cout << "     tx" << endl;
 	cout << "     unl_add <domain>|<public> [<comment>]" << endl;
 	cout << "     unl_delete <public_key>" << endl;