Hello @sv28
It’s great to hear that you are planning to start using Dhan APIs. Answering your questions below:
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Market Feed Data APIs are a work in progress. I have detailed out our approach here: Live Market Feed API - #2 by Hardik.
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We are evaluating adding special order APIs. This might include Forever Orders (GTT) as well.
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Intraday Historical Data is currently available, however it is only for current day.
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DhanHQ Trading APIs are absolutely free. Only Data APIs are exclusive which can be accessed either by paying 499 rupees or executing 25 F&O trades in the last 30 days. We added our pricing approach here - DhanHQ Superfast APIs Update: Trading APIs are now FREE for all