MasterData ETF Constituent Volume

Has anyone used ETF constituent volume - weighted or raw - from MasterData or any other source?
 
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etf issuers provide this data free and cash in lieu and more... ishares, vanguard, etc

Thanks. Do you know how up to date their constituent lists and weightings are kept? Some funds change more frequently than others.
 
etf issuers provide this data free and cash in lieu and more... ishares, vanguard, etc

I looked around and none of the free sources I found have a ready-to-import source. I'm looking for something that I can quickly merge with my eod quote database on a nightly basis.
 
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