CoinGecko Historical

Open the CoinGecko historical-data page for a coin in the user's default browser, centered on a one-day window around a target date.

Arguments

• coin-id (required): CoinGecko coin slug (e.g., bitcoin, ethereum, solana). This is the same ID used by the CoinGecko API and the cg CLI — not the ticker symbol. If the user provides only a symbol or name, resolve it first (e.g., cg search <term> -o json or https://api.coingecko.com/api/v3/search?query=<term>).
• date (required): Target date in YYYY-MM-DD format.

Behavior

Compute DATE-1 (the day before date) and DATE+1 (the day after date), then open:

https://coingecko.com/en/coins/<coin-id>/historical_data?start=<DATE-1>&end=<DATE+1>

Use the macOS open command:

open "https://coingecko.com/en/coins/<coin-id>/historical_data?start=<DATE-1>&end=<DATE+1>"

Date arithmetic

Use GNU/BSD date to compute the surrounding days. BSD date (default on macOS) syntax:

start=$(date -j -v-1d -f "%Y-%m-%d" "$DATE" +%Y-%m-%d)
end=$(date -j -v+1d -f "%Y-%m-%d" "$DATE" +%Y-%m-%d)

Example

User invokes: /coingecko-historical bitcoin 2024-03-14

Run:

open "https://coingecko.com/en/coins/bitcoin/historical_data?start=2024-03-13&end=2024-03-15"

Notes

• open is macOS-only. On Linux substitute xdg-open; on Windows use start.
• Validate the date format before computing offsets; stop and ask the user if date is missing or malformed.