diff --git a/libethcore/Common.h b/libethcore/Common.h
index 072d78cc3..883a14e9b 100644
--- a/libethcore/Common.h
+++ b/libethcore/Common.h
@@ -80,6 +80,7 @@ template <> inline u256 exp10<0>()
 static const u256 ether = exp10<18>();
 static const u256 finney = exp10<15>();
 static const u256 szabo = exp10<12>();
+static const u256 shannon = exp10<9>();
 static const u256 wei = exp10<0>();
 
 using Nonce = h64;
diff --git a/libethereum/GasPricer.h b/libethereum/GasPricer.h
index f0fc6b520..6dd034cf7 100644
--- a/libethereum/GasPricer.h
+++ b/libethereum/GasPricer.h
@@ -66,8 +66,8 @@ public:
 	u256 bid(TransactionPriority = TransactionPriority::Medium) const override { return m_bid; }
 
 private:
-	u256 m_ask = 10 * szabo;
-	u256 m_bid = 10 * szabo;
+	u256 m_ask = 50 * shannon;
+	u256 m_bid = 50 * shannon;
 };
 
 }
diff --git a/libethereum/Interface.h b/libethereum/Interface.h
index b21ebfdb2..013728042 100644
--- a/libethereum/Interface.h
+++ b/libethereum/Interface.h
@@ -70,25 +70,25 @@ public:
 	virtual std::pair<h256, Address> submitTransaction(TransactionSkeleton const& _t, Secret const& _secret) = 0;
 
 	/// Submits the given message-call transaction.
-	void submitTransaction(Secret const& _secret, u256 const& _value, Address const& _dest, bytes const& _data = bytes(), u256 const& _gas = 10000, u256 const& _gasPrice = 10 * szabo, u256 const& _nonce = UndefinedU256);
+	void submitTransaction(Secret const& _secret, u256 const& _value, Address const& _dest, bytes const& _data = bytes(), u256 const& _gas = 10000, u256 const& _gasPrice = 50 * shannon, u256 const& _nonce = UndefinedU256);
 
 	/// Submits a new contract-creation transaction.
 	/// @returns the new contract's address (assuming it all goes through).
-	Address submitTransaction(Secret const& _secret, u256 const& _endowment, bytes const& _init, u256 const& _gas = 10000, u256 const& _gasPrice = 10 * szabo, u256 const& _nonce = UndefinedU256);
+	Address submitTransaction(Secret const& _secret, u256 const& _endowment, bytes const& _init, u256 const& _gas = 10000, u256 const& _gasPrice = 50 * shannon, u256 const& _nonce = UndefinedU256);
 
 	/// Blocks until all pending transactions have been processed.
 	virtual void flushTransactions() = 0;
 
 	/// Makes the given call. Nothing is recorded into the state.
 	virtual ExecutionResult call(Address const& _from, u256 _value, Address _dest, bytes const& _data, u256 _gas, u256 _gasPrice, BlockNumber _blockNumber, FudgeFactor _ff = FudgeFactor::Strict) = 0;
-	ExecutionResult call(Address const& _from, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo, FudgeFactor _ff = FudgeFactor::Strict) { return call(_from, _value, _dest, _data, _gas, _gasPrice, m_default, _ff); }
+	ExecutionResult call(Address const& _from, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 50 * shannon, FudgeFactor _ff = FudgeFactor::Strict) { return call(_from, _value, _dest, _data, _gas, _gasPrice, m_default, _ff); }
 	ExecutionResult call(Secret const& _secret, u256 _value, Address _dest, bytes const& _data, u256 _gas, u256 _gasPrice, BlockNumber _blockNumber, FudgeFactor _ff = FudgeFactor::Strict) { return call(toAddress(_secret), _value, _dest, _data, _gas, _gasPrice, _blockNumber, _ff); }
 	ExecutionResult call(Secret const& _secret, u256 _value, Address _dest, bytes const& _data, u256 _gas, u256 _gasPrice, FudgeFactor _ff = FudgeFactor::Strict) { return call(toAddress(_secret), _value, _dest, _data, _gas, _gasPrice, _ff); }
 
 	/// Does the given creation. Nothing is recorded into the state.
 	/// @returns the pair of the Address of the created contract together with its code.
 	virtual ExecutionResult create(Address const& _from, u256 _value, bytes const& _data, u256 _gas, u256 _gasPrice, BlockNumber _blockNumber, FudgeFactor _ff = FudgeFactor::Strict) = 0;
-	ExecutionResult create(Address const& _from, u256 _value, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo, FudgeFactor _ff = FudgeFactor::Strict) { return create(_from, _value, _data, _gas, _gasPrice, m_default, _ff); }
+	ExecutionResult create(Address const& _from, u256 _value, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 50 * shannon, FudgeFactor _ff = FudgeFactor::Strict) { return create(_from, _value, _data, _gas, _gasPrice, m_default, _ff); }
 	ExecutionResult create(Secret const& _secret, u256 _value, bytes const& _data, u256 _gas, u256 _gasPrice, BlockNumber _blockNumber, FudgeFactor _ff = FudgeFactor::Strict) { return create(toAddress(_secret), _value, _data, _gas, _gasPrice, _blockNumber, _ff); }
 	ExecutionResult create(Secret const& _secret, u256 _value, bytes const& _data, u256 _gas, u256 _gasPrice, FudgeFactor _ff = FudgeFactor::Strict) { return create(toAddress(_secret), _value, _data, _gas, _gasPrice, _ff); }
 
diff --git a/libethereumx/Ethereum.h b/libethereumx/Ethereum.h
index 1e24b396c..ac6f9f115 100644
--- a/libethereumx/Ethereum.h
+++ b/libethereumx/Ethereum.h
@@ -62,11 +62,11 @@ public:
 	~Ethereum();
 
 	/// Submits the given message-call transaction.
-	void submitTransaction(Secret const& _secret, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo);
+	void submitTransaction(Secret const& _secret, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 50 * shannon);
 
 	/// Submits a new contract-creation transaction.
 	/// @returns the new contract's address (assuming it all goes through).
-	Address submitTransaction(Secret const& _secret, u256 _endowment, bytes const& _init, u256 _gas = 10000, u256 _gasPrice = 10 * szabo);
+	Address submitTransaction(Secret const& _secret, u256 _endowment, bytes const& _init, u256 _gas = 10000, u256 _gasPrice = 50 * shannon);
 
 	/// Injects the RLP-encoded transaction given by the _rlp into the transaction queue directly.
 	void inject(bytesConstRef _rlp);
@@ -75,7 +75,7 @@ public:
 	void flushTransactions();
 
 	/// Makes the given call. Nothing is recorded into the state.
-	bytes call(Address const& _from, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 10 * szabo);
+	bytes call(Address const& _from, u256 _value, Address _dest, bytes const& _data = bytes(), u256 _gas = 10000, u256 _gasPrice = 50 * shannon);
 
 	// Informational stuff