A Limited Access key is enough. It is stored only in this browser's localStorage and is sent only to api.torn.com when you press Refresh.
Never refreshed.
SettingsBackup & sync
This browser keeps 180 days of refreshes (up to 3,000). Sync shares one history across all your devices
through your own Cloudflare site. Only stats, perks and settings are synced; your API key never leaves this browser.