Feed statuses

Every Slate feed evaluates a status on each read. latestRoundData() returns a price only for OK, or for MARKET_CLOSED when the feed was deployed with allowMarketClosed. Every other status reverts with FeedUnavailable(status). latestQuote() never reverts, so you can always see why.

Status	Meaning	latestRoundData()
OK	Fresh and consistent.	Price
MARKET_CLOSED	Weekend, holiday or overnight gap, and the last price was fresh when the session closed.	Price if allowMarketClosed, else reverts
STALE	Older than maxAge while the market is open.	Reverts
ORACLE_PAUSED	Robinhood's oraclePaused() is set on the token.	Reverts
STRADDLE	Observed before a multiplier switch that has since happened, and the old multiplier was not recorded.	Reverts
CORPORATE_ACTION	Within the grace window after a large multiplier change.	Reverts
NO_DATA	No usable price.	Reverts

Evaluation order

1. NO_DATA if the source has nothing, or the price is not positive.
2. ORACLE_PAUSED if the token supports the flag and it is set. Testnet tokens use an older implementation without it, and SlateFeed probes for it with a gas-capped call.
3. CORPORATE_ACTION or STRADDLE around a multiplier switch. See The multiplier problem.
4. OK if the price is younger than maxAge.
5. MARKET_CLOSED if the session is closed and the price was fresh at the close. See Market calendar.
6. STALE otherwise.

Composed feeds

• SlateNavFeed takes the worst status of its constituents and the oldest observation time. One stale or paused stock makes the whole NAV unavailable.
• SlateQuotedFeed (a feed re-quoted in USDG) passes the base feed's status through, and reports STALE or NO_DATA if the USDG/USD price is unusable.