Ticker symbol, case-insensitive, e.g. `AAPL`, `^GSPC`, `EURUSD=X`, `BTC-USD`, `7203.T`.

Bar size. Default: `1d`. `1m` bars cover the last 30 days, at most 8 days per request. `2m`, `5m`, `15m`, `30m` and `90m` cover at most 60 days; `60m`, `1h` and `4h` at most 730 days.

A named window such as `1y`, `5y` or `max`. Ignored when `start` or `end` is sent; those define the window. Default: `1y` when neither is sent.

Window start, as an ISO 8601 date or time (such as `2026-01-31`) or epoch seconds. A time with no zone is UTC. It takes precedence over `range`.

Window end, as an ISO 8601 date or time or epoch seconds. It is exclusive: bars before it are returned. It takes precedence over `range`.

Corporate events to include: `div`, `split`, `capitalGain`, comma-separated. Default: `div,split`.

Include pre-market and post-market bars. Default: false.