How to do one thing with market data
A task, the handful of cards in this catalogue that actually do it, and the part nobody mentions until it has already cost you an afternoon — the rate limit, the unadjusted price, the licence that turns a side project into a contract.
How to backfill years of minute bars
US minute history comes as a paginated API, a flat-file drop or a one-off CSV purchase. Adjustment, delisted tickers and the licence decide it.
Next to Market Data6 approachesUpdated
How to download historical stock prices in Python
Three lines with yfinance, or a contract that will still work next quarter — and the split-and-dividend decision you have to make either way.
Next to Market Data5 approachesUpdated
How to draw candlesticks in your own app
A candlestick chart is ten lines of JavaScript. Which library you may ship it in is a licence question — attribution, seats, and free builds that expire.
Next to Charting Libraries6 approachesUpdated
How to export your broker trade history
The CSV in your broker's account menu is the ground truth. Getting it out is easy; making two brokers agree about what a trade was is the work.
Next to Journals6 approachesUpdated
How to get an options chain
Free chains exist and are delayed and greekless. Paid ones start near thirty dollars — and under all of them sits one fee schedule.
Next to Market Data5 approachesUpdated
How to get fundamentals into a spreadsheet
Statements as cells that refresh, in Excel or Google Sheets — the add-ins, the APIs under them, and the licence that ends the moment you share the file.
Next to Fundamentals6 approachesUpdated
How to get news headlines as data
Ticker-tagged headlines start free. What you buy past that is a display licence, somebody else's entity classifier, and whatever archive your tier reaches.
Next to Market Data6 approachesUpdated
How to get SEC filings as data
EDGAR hands you every US filing as JSON, free and keyless. What the XBRL endpoints hold, what they do not, and the rate limit that stops the naive loop.
Next to Fundamentals5 approachesUpdated
How to pull an economic data series
GDP, CPI, unemployment and rates are free from the agencies that compute them. The catch is revisions — today's series is not the one published then.
Next to Market Data6 approachesUpdated
How to read a brokerage account from code
Positions, balances and transactions out of a consented brokerage account. Connecting takes a day; keeping the connection alive is the product.
Next to Account APIs6 approachesUpdated
How to stream real-time stock quotes
Two free WebSockets will stream live US trades today. What they cost is not the subscription — it is which subscriber the exchange thinks you are.
Next to Market Data6 approachesUpdated