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Push interval: 1s For index price, use SPOT symbol such as SPOT_ETH_USDC instead of PERP_ETH_USDC
Parameters

Orderly Predict

Subscribe to SPOT_BTCTWAP60S_USDC@indexprice for the Predict Index, a rolling 60-second TWAP of Orderly’s BTC index price, updated every second. This is the price series used by the Predict chart and current price; TWAP rounds take their strike and expiry values from this series at the respective time boundaries.
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Subscribed Message
Read settlement_index_symbol from Predict info to identify each round’s actual price source and use {settlement_index_symbol}@indexprice directly. Rounds created before the TWAP transition retain SPOT_BTC_USDC; new rounds use SPOT_BTCTWAP60S_USDC. The underlying BTC index remains available at SPOT_BTC_USDC@indexprice. During a Predict Index service outage, no updates are pushed; use the last received timestamp to detect a stale series. Backfilled values after restart are available through index price history, not replayed on this topic. A Predict round’s own valuation index is not pushed on this topic. See Predict Index for the calculation and the distinction between the underlying index, Predict Index, and round valuation.