Open Interest Data

• OKX perpetual swaps: sum_open_interest is in contracts. Multiply it by ctVal (base coin for linear swaps, USD for inverse swaps). sum_open_interest_value is in USD.
• Bitget Futures: sum_open_interest is in the base coin. From the 2026-09 data-integrity release, sum_open_interest_value is the open interest multiplied by the mark price. Before this release, the column was empty.
• Kraken Futures: Inverse contracts (PI_, FI_) are USD contracts. From the 2026-09 data-integrity release, their sum_open_interest_value is the number of contracts multiplied by the contract size in USD. Earlier files multiplied it by the price. We corrected these files on 2026-09-30. Linear PF_ contracts are not affected.
• Lighter: From the 2026-09 data-integrity release, sum_open_interest is in base units, and sum_open_interest_value is the USD notional. Earlier files had the USD notional in sum_open_interest. We corrected these files on 2026-09-30.
• Binance Futures: Older open interest files can repeat snapshots that we already published in earlier hours. Remove duplicates on (symbol, timestamp). The SDK function get_open_interest already does this in each download. We plan a cleanup of the published history.
• Bybit Futures: Before the 2026-09 data-integrity release, ticker, mark price and open interest rows were change-only deltas. A field that did not change in a message is null. An open interest file exists only for hours in which open interest changed. Forward-fill the values for each symbol, and look back into earlier hours if necessary. From the release, each row contains the full carried-forward state. After a collector loses its state, the first hour contains only the fields that the collector received during that hour.
• Bybit Futures: From the 2026-09 data-integrity release, each symbol with a known open interest has a carried-forward row at the start of each hour. In this row, timestamp and received_time are both equal to the start of the hour. There is no flag column. Use these two values to identify the row.
• Bybit, OKX: The published open interest comes from the WebSocket ticker and open-interest channels. We do not publish the output of the REST open-interest pollers.
• BitMEX: Quantities are in raw units that are different for each instrument: XBTUSD in USD contracts, XBTUSDT in 1e-6 BTC, ETHUSDT in 1e-5 ETH, and spot pairs in 1e-8 of the base asset. Before you compare with other venues, check the multiplier of the instrument.

For missing hours, partial periods and pending corrections to published history, refer to Known Gaps & Corrections.