151-command Kraken CLI, Coinbase for Agents via MCP/CLI, and Robinhood's dedicated agentic accounts all converge on one chokepoint: the broker becomes the agent's data vendor, execution venue, and risk gate. x402 makes pay-per-query research composable, but if the agent buys the data, sizes the trade, and routes the order through the same platform, the UX win becomes a flow-data moat. DeFi already saw this with wallets, routers, and MEV-aware orderflow: whoever owns the default route captures the spread, the telemetry, and eventually the user's risk model.

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