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Order Book: A live list of all open buy and sell orders for an asset, sorted by price. It shows you what other traders are willing to pay or accept. Liquidity: How much of an asset is available to trade. Higher liquidity means you can buy or sell more easily without moving the price. Spread: The gap between the highest buy price (bid) and the lowest sell price (ask). A smaller spread usually means a more liquid market. Basis Point (BP): A tiny unit of measurement: 1 basis point = 0.01%. Used to express fees and rate changes precisely. Taker Fee: The fee you pay when your order fills immediately, removing liquidity from the order book (e.g., a market order). Maker Fee: The fee or rebate applied when your order adds liquidity to the order book by waiting to be filled (e.g., a limit order that doesn’t match right away). Builders set the user-facing maker fee. When that fee is negative, Orderly can fund the trader rebate up to the Builder’s tier cap. The funded rebate is passed through to the trader and is not Builder revenue. Unsettled PnL: Profit or loss from a perp position that hasn’t been settled yet. Settlement transfers USDC between winning and losing positions. Maintenance Margin: The minimum collateral you must keep in your account to avoid liquidation. If your margin drops below this level, your position gets liquidated. Initial Margin: The collateral required to open a new position. The exact amount depends on the market and the leverage you choose. Funding Fee: A periodic payment between long and short traders that keeps perp prices close to the actual market price of the underlying asset. Learn more here. Cost Position: Your average entry price plus any fees you’ve paid (trading fees, funding fees). This is what’s used to calculate your unrealized PnL. Mark Price: A fair-value estimate for a perp contract, calculated from prices across multiple spot exchanges. It’s designed to be stable and resistant to manipulation, and it’s the price used to determine liquidations. Learn more here. Index Price: The volume-weighted average price of an asset across major spot exchanges. Learn more here. Last Price: Simply the most recent price at which a trade was executed. Open Interest: The total number of outstanding perp contracts that haven’t been closed. It’s a measure of how active a market is, denominated in USDC. Liquidation: When your collateral falls too low to support your position, the system forcibly closes it to prevent further losses. Auto De-leveraging (ADL): A safety mechanism that kicks in when normal liquidation can’t fully close a position. It automatically reduces opposing positions to keep the system solvent. Learn more here. Insurance Fund: A reserve pool that covers losses when a liquidated position can’t be fully absorbed by liquidators. It’s funded by liquidation fees and by Orderly. Learn more here. Round: A single Orderly Predict market cycle with a start time and an expiry time. Each round opens for trading, records a strike, and settles to UP, DOWN, or a tie at expiry. Learn more here. Strike (S0): The reference price recorded at the start of an Orderly Predict round’s observation window. The round’s outcome is decided by comparing the expiry price against the strike. Expiry Price (S1): The price recorded at the end of an Orderly Predict round’s observation window, used only to compare against the strike to decide the outcome. Outcome: The result of an Orderly Predict round: UP if the expiry price is above the strike, DOWN if it’s below, or a tie if the two are equal. Learn more here. Settlement Price: The price used to pay out an Orderly Predict round’s positions: $1 per share for the winning side and $0 for the losing side, or $0.50 per share for both sides if the round ties. Tie: The outcome when the expiry price exactly equals the strike. Neither UP nor DOWN wins; both sides settle at $0.50 per share. Learn more here. UP: The side of an Orderly Predict round that wins if the expiry price is above the strike. Buying UP opens a positive position. DOWN: The side of an Orderly Predict round that wins if the expiry price is below the strike. Buying DOWN opens a negative position and is placed as a sell order on the UP order book. Share: The unit of position size in Orderly Predict. Each share pays out $1 if its side wins, $0 if it loses, or $0.50 if the round ties.