Decision: short BTC-USD perpetual at 800x, targeting a 30 bp favorable price move. This is one dated decision, with low confidence, based on the Hyperliquid BBO mid fetched at 2026-10-16T19:41:44.682238Z. No position was opened.

{
  "direction": "short",
  "leverage": 800,
  "take_profit_bp": 30,
  "take_profit_price": 81101.4635,
  "bust_distance_bp": 7.7,
  "bust_price_estimate": 81408.136035,
  "expected_net_return_on_margin_pct": 197.701699,
  "confidence": 0.37,
  "regime": "volatile_choppy",
  "key_levels": {
    "support": 81278,
    "resistance": 81434
  },
  "entry_mid": 81345.5,
  "data_time_utc": "2026-10-16T19:41:44.682238Z",
  "reasoning": "Hyperliquid /info snapshots show a 25.62 bp decline over 15 closed minutes, price 5.14/7.38 bp below falling 1m EMA9/20, and visible asks of 125.82 BTC versus 24.94 BTC bids, supporting a short despite rising 5m EMAs. At 800x, the 7.7 bp bust buffer exceeds recent 5.27 bp/min volatility but remains vulnerable to ordinary rebounds; 900-1000x produced worse six-hour historical barrier diagnostics. The 30 bp target keeps 82.38% of the raw gain after the haircut and win fee, yielding 197.70% on margin if reached; six-hour candle proxies reached it first in 123/330 overlapping windows, with a 10-minute median among wins. That is an uncalibrated historical comparison, not a forecast: the latest fully observable 30 entry windows won only 4/30, so confidence is low.",
  "risks": "A rebound from 81321-81333 support through the estimated 81408.136035 bust price would forfeit the full margin before resistance at 81434; the latest 15 closed candles include a 14.59 bp upward excursion, larger than the bust buffer. The ask-heavy book is shallow and can disappear, while rising 5m EMAs could sustain a squeeze."
}

Evidence and attribution. All market observations below come from timestamped HTTP POST responses from the Hyperliquid public info API, preserved in data/ with their exact request bodies, request times, and receipt times. The official API reference documents the candle and book endpoints. The final book's exchange timestamp is 2026-10-16T19:41:44.381000+00:00; it has best bid 81,345 and best ask 81,346, so the execution mid is exactly 81,345.5. This is the requested five-significant-figure book, whose ask agrees with the context's impact-price ask and whose mid agrees with the context's quoted mid; the decision uses the book directly.

The VWAP values use candle typical price (high + low + close)/3 weighted by BTC volume, excluding unfinished candles. They are interval VWAP approximations, not tick VWAP or midnight-session VWAP. Candle endpoints can include the candle overlapping the start boundary. EMAs start at the first retained close, without earlier warm-up history; the 1m EMA20 may consequently retain a small initialization effect. The book is unusually ask-heavy in both captures: the first had 32.44 BTC bids versus 99.18 BTC asks. This persistence over approximately 107 seconds is corroboration, not proof of future selling; orders can be canceled.

Nearby chart levels are observations, and their interpretation as support or resistance is an inference. The newest 1m lows around 81,321–81,333 are immediate support; 81,278 is the 19:15 five-minute candle low and the principal reported support. Resistance is 81434 USD, the 19:35 five-minute high. The estimated bust at 81408.136035 USD lies below that resistance, so reaching resistance is unnecessary for liquidation. The target at 81101.4635 USD requires breaks of intermediate support, and aims at the earlier 81100 area; the 19:00 five-minute close was 81071. These are reaction levels, not guaranteed barriers.

Target and leverage sizing. The assignment supplies the bust rule and the PaperTrade win haircut; these were not independently verified against a contract. At 800x, bust distance is 10000/800 − 4.8 = 7.7 bp. For a short, the target is 81345.5 × (1 − 30/10000) = 81101.4635; bust is approximately 81345.5 × (1 + 7.7/10000) = 81408.136035.

The deadband-adjusted move is (30 − 0.2)/10000 = 0.00298. Applying the supplied scale and then the 2% win fee produces 197.701699% net return on margin if the target hits, versus −100% at liquidation. This retains 82.3757% of the original 240% raw leveraged gain. The requested return field is conditional on a win; it is not an unconditional expected return. In a simplified two-outcome model without an unresolved position, the break-even win probability is 33.59%. A 20 bp target at 800x yields only 127.51% after the haircut; the larger target buys substantially greater payoff at the cost of a lower hit rate.

The six-hour diagnostic enters at each closed 1m candle close and follows the next 30 complete candles. Its first event is target, bust, ambiguous if both are touched in one candle, or unresolved. A candle opening beyond a barrier resolves at that open. Historical candles describe traded prices, not the BBO mids that actually execute and liquidate PaperTrade; these results are therefore a proxy, not an execution backtest.

The score charges unresolved and ambiguous windows as full losses at 30 minutes solely to compare setups. It is not a forced timed exit and does not change the specified trade, which remains open until target or liquidation. Winning 800x/30 bp windows took a median 10 minutes. The full comparison includes long and short, six leverage settings from 750 to 1000, and seven targets; see data/metrics.json. The 750x/30 bp setup has a slightly better in-sample score than 800x/30 bp. Choosing 800x is a judgment that the extra conditional payoff is worth that small historical-score reduction; this is not proof of a globally optimal choice. Higher leverages materially worsened this proxy score.

The recent comparison is a strong contrary signal: for 800x/30 bp short, only 4 of 30 latest fully observable entry windows won, and 26 busted. These entries are approximately 18:41–19:10 UTC, since a full future 30-minute path is required; they do not test entries made during the latest downward turn. The six-hour set spans approximately 13:41–19:10 entries. Windows overlap heavily, are not independent, and parameter comparison creates selection bias. No out-of-sample test or calibrated probability model establishes positive expected value. Confidence 0.37 is a subjective, low-confidence assessment of target-before-bust, informed by these conflicts, not a statistically validated probability. The regime is volatile/choppy because the latest downward turn conflicts with the still-rising 5m trend and recent sharp two-way swings.

The latest recentTrades response contains only 10 fills over 4.311 seconds, totaling 0.00313 BTC labeled B and 0.00886 BTC labeled A. This is too small and clustered to support a representative cumulative volume delta or meaningful average-trade-size inference; it is not used as a directional pillar. Only a roughly 107-second OI comparison is available. No liquidation heatmap, historical BBO-mid path, calendar-day prior high/low, cross-exchange flow series, or proprietary position data was obtained.

Scheduled events were checked against primary calendars. At 19:41 UTC it is 15:41 EDT. The NYSE calendar lists the 16:00 EDT core close and 15:50–16:00 closing imbalance period, within the ideal trade horizon. The Federal Reserve October calendar lists H.15 and H.8 at 16:15 EDT, or 20:15 UTC, within the next hour but just beyond a 30-minute target horizon. Today's BLS import/export-price release was scheduled at 08:30 EDT, well before entry, according to the BLS 2026 schedule. These checks do not establish the absence of unscheduled headlines or every other agency's releases. An initial broad news search was not used as a trade signal because it did not add verified, sufficiently timely primary evidence. A price reversal around the equity close is a risk inference, not an observed causal relationship.

Checks. The offline verification checks the exact output schema, numeric ranges, live-book arithmetic, target and bust direction, haircut formula, candle ordering and completeness, metric replay, and synthetic first-event edge cases. It verifies arithmetic and provenance consistency, not profitability or execution behavior. The analysis places no orders and assumes no timed exit, fees, slippage, spread cost, or funding beyond the assignment's stated mechanics. Data and inference are valid only as of the saved snapshot; a later entry will have different levels and can materially change the trade.