Insider trading data API: pull SEC Form 4 transactions for a stock watchlist
Pull SEC Form 4 insider transactions for a stock watchlist with Python: decode transaction codes, paginate the API, and build a screening table with pandas.
The SiftingIO Blog
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Engineering deep-dives, market analysis, and product updates from the SiftingIO team. How we build real-time market data infrastructure across crypto, FX, and equities.
Latest posts
Aligning economic calendar events with your backtest's bar timeline
How to pull scheduled US economic events from one endpoint and align them with OHLCV bars so a backtest knows when CPI, NFP, and FOMC actually hit.
US stock market data API: build a live price chart with historical bars and real-time ticks
Build a live US stock price and chart page: backfill adjusted OHLCV history over REST, stream real-time ticks over WebSocket, and handle market sessions.
yfinance rate limited: migrating Python price pulls to a keyed market data API
yfinance rate limited or throwing Too Many Requests? A call-for-call map to move daily history, intraday bars, and latest-price pulls to a keyed API in Python.
MiCA crypto trade reporting: one trade format for 27 countries is a normalization problem
MiCA crypto trade reporting mandates one uniform trade format across the EU's 27 countries. Why it's a cross-venue data-normalization problem, not paperwork.
Economic calendar webhook alerts: get CPI and jobs report releases pushed to your app
Get CPI and jobs report releases pushed to any webhook: a Node.js poller on SiftingIO's economic calendar API, with plan limit math and common pitfalls.
Weighted median price aggregation: why averaging venue prices fails
Why the same asset shows different prices on different venues, how naive averages get poisoned by bad feeds, and how a weighted median keeps the price honest.
Economic calendar API: handling revisions, timezones, and the bar each release moved
Ingest CPI and NFP releases from an economic calendar API: handle first prints vs revisions, normalize times to UTC, and tag the bar each event moved.
Bid ask spread: how to read a quote and flag a wide or stale one in code
How to read bid and ask from a quote snapshot, compute the bid ask spread in basis points, and flag wide or stale quotes in Python before users see them.