Place a paper spot order. coinId is a coin UCID, NOT a ticker. orderType market/limit/stop. limitPrice required for limit & stop; stopPrice required for stop. idempotencyKey is REQUIRED and unique per intent (reuse replays the original result — retry a timed-out call with the SAME key; it will never double-execute). Requires the trade:spot scope. CONFIRM with the user before calling. Paper trading only — virtual funds (50,000 mUSD). Not financial advice.
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