We analyze the structure of the world foreign currency exchange market viewed as a network of interacting currencies. We analyze daily times series for a set of 40 independent currencies and gold  (by independent currencies we mean currencies which are not explicitly pegged to any other currency). Our data spans the time period 1999-2008. We group together all the exchange rates with a common base currency and study each group separately. Essentially, our study goes into four directions: (i) we analyze topology of  different network representations (i.e. for different base currencies) trying to identify roles played by distinct currencies in the world's currency system; (ii) we consider temporal evolution of the forex network and investigate the long-term trends alternating the network's structure; (iii) we deconstruct the data into sign and amplitude components in order to analyze impact of these components on global network structure and behaviour; (iv) we search for subtle effects of information transfer between distinct currency cross-rates, which can be identifiable at daily time scales.

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