Publicly priced instruments with accessible APIs or data feeds. Switchboard can pull from Bloomberg, Alpaca, EMMA, exchange feeds, fund company APIs, etc.
Data exists somewhere but requires custom data source configuration by the builder.
Not oracle-able due to: legal non-transferability, dead/obsolete markets, pure tax instruments, individualized instruments, or structurally non-standardizable assets.
Sensitive or confidential underlying data that should be kept private from the oracle operator and on-chain observers. Needs Data Feed Variable Overrides to preserve privacy.