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OCO (One Cancels the Other) OCO Order Definition: An OCO (One Cancels the Other) order is a pair of conditional orders where the execution of one automatically cancels the other — combining a take-profit limit order with a st... On-Balance Volume (OBV) On-Balance Volume (OBV) Definition: On-Balance Volume is a volume-based momentum indicator developed by Joseph Granville and published in his 1963 book "Granville's New Key to Stock Market Profits,... On-Chain Analysis On-Chain Analysis Definition: On-Chain Analysis is the practice of examining blockchain data — transactions, wallet activity, network flows, mining/staking patterns — to derive insights about crypt... Open Interest Open Interest Definition: Open interest is the total number of outstanding derivative contracts (futures or options) that have not been settled, closed, or exercised — measuring the aggregate expos... Open Position Open Position Definition: An open position is any trade that has been entered but not yet closed — a buy or sell that is currently active and exposed to market price movements. Every open position ... Operating Costs Operating Costs Definition: Operating costs (also called operating expenses or OPEX) are the ongoing expenses a business incurs to run its day-to-day operations — distinct from capital expenditure ... Optimal Capital Structure Optimal Capital Structure Definition: Optimal capital structure is the mix of debt and equity financing that minimises a company's weighted average cost of capital (WACC) and maximises its value to... Optimism (OP) Optimism Definition: Optimism is an Ethereum Layer 2 scaling solution using optimistic rollup technology similar to Arbitrum, processing transactions off-chain while settling on Ethereum mainnet. O... Optimistic Rollup Optimistic Rollup Definition: An Optimistic Rollup is a Layer 2 scaling solution that assumes off-chain transactions are valid by default and only verifies them through fraud proofs if challenged w... Oracle Oracle Definition: An Oracle in cryptocurrency is a service that provides smart contracts with external data — such as asset prices, weather information, or sports results — by connecting blockchai... Order Book Order Book Definition: An order book is a real-time list of all unfilled buy and sell orders for an asset on a trading venue, organized by price level and quantity. It shows the highest bid prices ... Order Flow Order Flow Definition: Order flow refers to the stream of buy and sell orders entering financial markets, providing real-time data about market participant intentions, supply and demand dynamics, a... Over-the-Counter (OTC) Over-the-Counter (OTC) Definition: Over-the-Counter trading is the direct exchange of financial instruments between two parties without going through a centralized exchange, typically conducted thr... Oversold Oversold Definition: Oversold is a market condition where an asset's price has fallen substantially over a short period to levels that suggest the downward move may be unsustainable, indicating pot... Overtrading Overtrading Definition: Overtrading is the destructive behavioral pattern of executing too many trades relative to genuine opportunities, often driven by emotional needs (entertainment, control, eg...