When a programmer talks about using something like the S&P 500 index to create trading algorithms, from what source does this data update in a format a computer can scan?
How do programmers usually interface with stock data?
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Prolog:
a) Trading strategy is typically not proposed by programmers.
b) Programmers are typically responsible for implementing a trading strategy ( code it )
c) Trading strategy gets to the programming phase if & only if there is a quantitatively tested reasonably robust edge ( Obviously it makes no sense to implement any underperforming model, does it? )
d) Given the c), the Quants are well equipped with adequate technical + fundamental data, to execute quantitative modelling prior to driving a decision, whether b) would ever start or not.
e) APIs / DataStores for in-vitro Quant modelling are by far different from APIs / Streaming Gateways used for feeding a real-time operation of the same Trading Strategy in-vivo.
Epilogue: