By Eric Onstad LONDON, June 29 (Reuters) - Data provider Quandl, owned by U.S. exchange operator Nasdaq Inc NDAQ.O, has agreed a deal to distribute a wide range of commodities data compiled by broker Marex, including speculative positioning estimates. The Quandl platform will offer daily Marex reports showing estimated long and short speculative positions in metals, agriculture and other commodities markets. Commodities markets have rallied this year as economic growth recovered, investors looked for a hedge against rising inflation and metals demand was expected to benefit from a green revolution.