Data-Feeds

2:30 AM friday. been at this since 9 PM. promised myself two weeks ago, right in the middle of the tariff chaos, that i’d actually fix the IV rank staleness issue. the signal quality scoring work was the band-aid — a composite gate that tells the system “this signal isn’t reliable right now.” it worked. it’s in production. but the underlying problem was unchanged: during the spike, my IV rank was being computed from options data that was 10-14 minutes old. the signal wasn’t wrong, technically. it was just answering a question about a market that no longer existed.

been using polygon.io as primary data source since 2023. added iex cloud as backup last year. here’s how they compare for algo trading. polygon.io (primary) # what I use it for:

been running both for 8 months now. time for an honest comparison. why both # polygon.io: primary equities and options quotes

been using thetadata for 8 months now. here’s the real review for options algo traders. what is thetadata # options-focused market data provider.

been using both for 2 years. polygon primary, alpha vantage backup. time for honest comparison. my setup # polygon.io:

real-time data = critical for algo trading. redis = in-memory cache for speed. python pipeline implementation. the latency problem # pulling data every request:

data feeds = foundation of algo trading. garbage data = garbage trades. i’ve used both polygon.io and alpha vantage extensively. spent months researching data feeds when i started trading. NexusFi community helped narrow down options to these two.

been using polygon.io for options data since april. here’s my review after 1 month. background # was using alpha vantage (free tier) until march. data quality was shit:

your backtest is only as good as your data. spent $200/month on polygon.io and holy shit the difference vs free data. what i was using (bad) # alpha vantage free tier