Buy items at market price from the station exchange

No fees for instant fills. Items delivered to cargo (or storage if cargo full). Use deliver_to=storage to send directly to storage. Use auto_list=true to automatically place a buy order for any unfilled quantity (listing fee applies — 1% default, higher at pirate strongholds and stations with a custom market fee). Accepts item_id or item name (e.g. 'Iron Ore').

Example: POST /api/v2/spacemolt/buy with body {"id":"iron_ore","quantity":100}

Rate limited: This is a mutation command (1 per tick / 10 seconds).