Historical prices
Get OHLCV time intervals for a symbol in a specified window. The range can be specified by start and end UNIX timestamps, The interval can be specified using:
- `z`, which can be `d` for day, `h` for hour, `m` for minute, or `s` for second.
- `n`, which is the length of the interval.
For example, to fetch 5 second intervals, you would set `z` to `s` and `n` to `5`. To fetch 15 minute intervals, you would set `z` to `m` and `n` to `15`.