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I am having hard time understanding the price difference of yahoo option chains.

For example: Yahoo shows for TWTR FEB 17, 2017 CALL @16.50 option

Strike Last Price    Bid      Ask
16.50    0.10          0.09   0.10

Whereas at a stock broker (ex: tastyworks) for TWTR FEB 17, 2017 CALL @16.50 option

Strike    Bid    Ask
16.50     0.30   0.31

Whereas at a stock broker (ex: thinkorswim) for TWTR FEB 17, 2017 CALL @16.50 option

Strike    Bid    Ask
16.50     0.28   0.29

I can understand the difference between thinkorswim vs tastyworks but not yahoo. Where does the difference between comes from ? Is yahoo delayed ? If that's the case why people bother reading yahoo options?

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    $\begingroup$ Yahoo's data is >=15minutes delayed, e.g. TWTR170217C00016500 says OPR - OPR Delayed price. $\endgroup$ – rbm Feb 17 '17 at 16:41
  • $\begingroup$ See finance.yahoo.com/exchanges?bypass=true There's a Sign up for the Real-time Package. option $\endgroup$ – rbm Feb 17 '17 at 16:45
  • $\begingroup$ there goes the pandas data reader option. Any suggestions for options algo trading? @rbm $\endgroup$ – Matt Feb 17 '17 at 17:23

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