Precious metal trading is no longer offered to US based clients due to regulatory requirements.
If you are non-US based, then try the following:
If you are using OANDA's fxTrade, follow these instructions:
2. Open the dropdown list at the top left, and select 'Precious Metals'.
3. Click or tap on 'Add All', next choose 'Apply' and then 'Save' to add all precious metal pairs to your quoting panel.
If you are using our MT4 platform, right-click on any area within the 'Market Watch' section, and then select 'Show All'.
Please note: palladium is not available to residents of Canada.