Coinbase Global Inc（COIN.O）：非现货业务动能积聚，零售交易疲弱仍是核心分歧

3Q'26 reinforced the central Coinbase debate: can newer revenue streams scale quickly enough to offset structurally weaker retail trading activity? While transaction revenue fell well short of expectations on softer retail volumes and lower mix, the quarter also highlighted continued progress across prediction markets, stablecoins, derivatives, and lending. Management's commentary suggests these businesses are increasingly becoming meaningful contributors rather than longer-term options on future growth. The result is a mixed but largely unchanged thesis: near-term earnings power resets lower given weaker trading assumptions, but the long-term diversification story remains intact. 3Q positives include prediction markets surpassing a $200M annualized revenue run-rate, stablecoin revenue beating expectations with USDC balances at new highs, strong expense discipline in T&D and G&A, and expanding derivatives, prediction markets and lending. Negatives include transaction revenue missing Ci