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+# Using Price Solver
+
+Price solver is a tool to calculate the price of a market based on the prices of other markets. It is useful when you
+want to calculate the price of a market that is not directly available on the exchange.
+
+## Simple Price Solver
+
+Simple price solver is a price solver that calculates the price of a market based on the prices of other markets.
+
+You may add a field to the struct to store the price solver:
+
+	priceSolver    *pricesolver.SimplePriceSolver
+
+To use the simple price solver, you need to create an instance of `SimplePriceSolver` and bind the market data stream of
+the source markets to it.
+
+	s.priceSolver = pricesolver.NewSimplePriceResolver(sourceMarkets)
+	s.priceSolver.BindStream(s.sourceSession.MarketDataStream)
+
+To update the price of the target market, you may call the `UpdatePrice` method of the price solver.
+    
+    s.priceSolver.Update(symbol, price)