[OKX Extends Spark USDC On-Chain Earn Activity to March 12, 2026] OKX has announced the extension of the Spark USDC on-chain earn activity to March 12, 2026, at 16:00 (UTC+8). Users can subscribe to the Spark Protocol's on-chain earn product with USDC and enjoy up to 10% annualized returns (including the base rate and a 5.5% real-time promotional annualized rate). Rewards will be distributed daily to funding accounts. The activity is limited to main accounts only; sub-accounts are not eligible. The total prize pool is 6 million SPK. For detailed rules and participation methods, please refer to the OKX official website.