I am interested in commodity price data trading. Does anyone trade commodities, or keeps track of their prices? Do you use regular broker, or other tools to check the commodity prices? I have heard that a good tool is API data providers that constantly give you spot and historical prices of various commodities including energy, agricultural, industrial, metals, etc.
I use IB (Interactive Brokers) for futures trading, using the data that IB provides. Some find that their data isn't satisfactory, but it suits my needs and I stick to it.
The other option is trading CFDs. I don't do this any more, but it was a good introduction to futures trading. Here I used CMC with their data. IB (last time I looked) did not support commodity CFDs, so (for me), CMC was the best choice.