Capital Spreads. financial-spread-betting.com/ccount/click.php?id=3 What are the most traded markets in financial spread betting? The most popular market is the FTSE 100 index which we call the UK 100 Daily Rolling. That is definitely the most traded spread betting market amongst our clients. Next are the currencies in particular EUR/USD which forex pairing comes up with very tight spreads. That is also very popular with clients. What is interesting is that both index and foreign exchange markets have been fairly popular this year. In August we saw big leaps in clients trading indices.