SPY V12 0DTE Risk-Cap Strategy

single-strategy report for enhanced_equity_scaled_40risk_risk_cap_only_8wide ยท generated 2026-05-26T14:13:34

This report shows one strategy only: a paper/research SPY 0DTE defined-risk spread strategy using $8-wide wings and a 40% account-risk cap. It does not include alternate variants or optimizer comparisons.

Paper / Research Defined Risk
InstrumentSPY 0DTE options

Same-day SPY call and put credit spreads from ThetaData bid/ask snapshots.

StructureShort credit spreads

Main trades use 10 bp OTM shorts; RSI follow-up/standalone trades use 0 bp shorts.

Risk Sizing40% risk-cap only

No fixed contract target. Contracts are sized by quote-specific max risk and account equity.

Wings$8 wide

The long option is $8 away from the short option to cap downside.

Entries10:30 ET + RSI ladder

Main lane uses the morning direction signal; follow-up/standalone lanes require RSI extremes.

ExitsProfit exits or timed close

Trades close on profit target when hit, otherwise by the strategy's same-day close rule.

Backtest Window2023-01-03 to 2026-05-19
Starting Equity$10,000.00
Final Equity$40,857.00
Total Return308.57%
Max Drawdown-27.48%
Trades84
Win Rate77.38%
Net PnL$30,857.00
Gross Credit Sold$127,758.00
Largest Contracts32
Largest Risk Used39.99%
Worst Trade$-7,350.00

Performance

V12 Strategy SPY Buy/Hold Growth of $10,000.00: strategy $40,857.00 (308.57%) vs SPY $19,267.11 (92.67%) 2023-01-03 2026-05-19 SPY close source: spy_straddle_return_components_20160104_present.csv

Blue is the strategy equity curve. Gray is SPY buy-and-hold normalized to the same starting equity.

Trade Mix

Leg TypeTradesShare
initial call spread3440.48%
initial put spread3035.71%
followup put spread78.33%
standalone q82 put spread55.95%
followup call spread44.76%
standalone q82 call spread44.76%

42 call-spread trades and 42 put-spread trades. 65 winners, 19 losers.

Yearly Results

YearTradesPnLEnding EquityYear ReturnWin Rate
202312$2,263.00$12,263.0022.63%91.67%
202428$4,155.00$16,418.0033.88%78.57%
202529$21,742.00$38,160.00132.43%75.86%
202615$2,697.00$40,857.007.07%66.67%

Historical Trade Log

Prices are option prices per share. Cash values use the standard 100-share option multiplier. Full CSV: thetadata_spy_v12_enhanced_equity_scaled_40risk_risk_only_trades.csv.

#DateEntryCloseTradeContractsCredit / ShareClose DebitMax RiskRisk UsedPnLClose ReasonOption Legs
12023-03-0810:30:0013:00:00call first, 10 bp OTM, $8-wide wings5$0.59$0.19$3,705.0037.05%$200.00call profit target 50%STO 2023-03-08 400C @ 0.60; BTO 2023-03-08 408C @ 0.01
22023-03-1512:30:0014:00:00put standalone q82 rsi80 20, 0 bp OTM, $8-wide wings5$1.11$0.51$3,445.0033.77%$300.00put profit target 50%STO 2023-03-15 384P @ 1.17; BTO 2023-03-15 376P @ 0.06
32023-03-1710:30:0015:30:00put first, 10 bp OTM, $8-wide wings5$0.96$0.41$3,520.0033.52%$275.00put profit target 50%STO 2023-03-17 390P @ 1.00; BTO 2023-03-17 382P @ 0.04
42023-04-0510:30:0014:00:00put first, 10 bp OTM, $8-wide wings5$0.48$0.16$3,760.0034.90%$160.00put profit target 50%STO 2023-04-05 406P @ 0.50; BTO 2023-04-05 398P @ 0.02
52023-05-0210:30:0015:00:00put first, 10 bp OTM, $8-wide wings5$0.62$0.19$3,690.0033.74%$215.00put profit target 50%STO 2023-05-02 410P @ 0.64; BTO 2023-05-02 402P @ 0.02
62023-05-0410:30:0013:00:00put first, 10 bp OTM, $8-wide wings6$0.99$0.23$4,206.0037.72%$456.00put profit target 50%STO 2023-05-04 403P @ 1.04; BTO 2023-05-04 395P @ 0.05
72023-05-2610:30:0015:45:00call first, 10 bp OTM, $8-wide wings6$0.67$0.53$4,398.0037.89%$84.00call timed close 15:45:00STO 2023-05-26 420C @ 0.68; BTO 2023-05-26 428C @ 0.01
82023-09-0810:30:0011:00:00call first, 10 bp OTM, $8-wide wings6$0.49$0.21$4,206.0035.98%$168.00call profit target 50%STO 2023-09-08 447.5C @ 0.50; BTO 2023-09-08 455C @ 0.01
92023-10-1610:30:0015:45:00call first, 10 bp OTM, $8-wide wings6$0.56$0.10$4,464.0037.65%$276.00call profit target 50%STO 2023-10-16 437C @ 0.57; BTO 2023-10-16 445C @ 0.01
102023-10-2010:30:0013:00:00put first, 10 bp OTM, $8-wide wings6$0.80$0.33$4,320.0035.60%$282.00put profit target 50%STO 2023-10-20 422P @ 0.83; BTO 2023-10-20 414P @ 0.03
112023-11-0110:30:0013:00:00call first, 10 bp OTM, $8-wide wings7$1.20$0.57$4,760.0038.34%$441.00call profit target 50%STO 2023-11-01 422C @ 1.21; BTO 2023-11-01 430C @ 0.01
122023-11-0210:30:0015:45:00call first, 10 bp OTM, $8-wide wings6$0.64$1.63$4,416.0034.35%$-594.00call timed close 15:45:00STO 2023-11-02 429C @ 0.65; BTO 2023-11-02 437C @ 0.01
132024-03-0813:00:0014:30:00put standalone q82 rsi80 20, 0 bp OTM, $8-wide wings6$0.83$0.25$4,302.0035.08%$348.00put profit target 50%STO 2024-03-08 512P @ 0.86; BTO 2024-03-08 504P @ 0.03
142024-03-1210:30:0013:00:00call first, 10 bp OTM, $8-wide wings6$0.75$0.34$4,350.0034.49%$246.00call profit target 50%STO 2024-03-12 516C @ 0.76; BTO 2024-03-12 524C @ 0.01
152024-04-1910:30:0015:45:00put first, 10 bp OTM, $8-wide wings7$0.94$2.69$4,942.0038.44%$-1,225.00put timed close 15:45:00STO 2024-04-19 497P @ 1.02; BTO 2024-04-19 489P @ 0.08
162024-04-3010:30:0015:45:00put first, 10 bp OTM, $8-wide wings6$0.71$2.65$4,374.0037.60%$-1,164.00put timed close 15:45:00STO 2024-04-30 507P @ 0.75; BTO 2024-04-30 499P @ 0.04
172024-06-1210:30:0015:00:00call first, 10 bp OTM, $8-wide wings6$1.17$0.21$4,098.0039.15%$576.00call profit target 50%STO 2024-06-12 545C @ 1.19; BTO 2024-06-12 553C @ 0.02
182024-07-1510:30:0014:00:00call first, 10 bp OTM, $8-wide wings5$0.48$0.07$3,760.0034.05%$205.00call profit target 50%STO 2024-07-15 564C @ 0.49; BTO 2024-07-15 572C @ 0.01
192024-07-1910:30:0015:45:00put first, 10 bp OTM, $8-wide wings6$0.95$1.68$4,230.0037.60%$-438.00put timed close 15:45:00STO 2024-07-19 550P @ 1.00; BTO 2024-07-19 542P @ 0.05
202024-07-2610:30:0015:00:00call first, 10 bp OTM, $8-wide wings6$0.97$0.36$4,218.0039.02%$366.00call profit target 50%STO 2024-07-26 545C @ 1.00; BTO 2024-07-26 553C @ 0.03
212024-09-0510:30:0011:00:00call first, 10 bp OTM, $8-wide wings6$0.84$0.26$4,296.0038.44%$348.00call profit target 50%STO 2024-09-05 554C @ 0.85; BTO 2024-09-05 562C @ 0.01
222024-09-0512:00:0013:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings6$1.16$0.56$4,104.0035.61%$360.00put profit target 50%STO 2024-09-05 547P @ 1.21; BTO 2024-09-05 539P @ 0.05
232024-09-0513:00:0014:00:00put standalone q82 rsi80 20, 0 bp OTM, $8-wide wings6$0.84$0.22$4,296.0036.15%$372.00put profit target 50%STO 2024-09-05 548P @ 0.87; BTO 2024-09-05 540P @ 0.03
242024-09-1110:30:0012:00:00put first, 10 bp OTM, $8-wide wings7$1.17$0.24$4,781.0039.01%$651.00put profit target 50%STO 2024-09-11 540P @ 1.24; BTO 2024-09-11 532P @ 0.07
252024-09-1114:00:0015:45:00call followup rsi80 20, 0 bp OTM, $8-wide wings6$0.57$1.96$4,458.0034.54%$-834.00call timed close 15:45:00STO 2024-09-11 551C @ 0.58; BTO 2024-09-11 559C @ 0.01
262024-09-1210:30:0012:00:00call first, 10 bp OTM, $8-wide wings6$0.97$0.46$4,218.0034.93%$306.00call profit target 50%STO 2024-09-12 557C @ 0.99; BTO 2024-09-12 565C @ 0.02
272024-09-1910:30:0012:00:00call first, 10 bp OTM, $8-wide wings7$1.07$0.46$4,851.0039.18%$427.00call profit target 50%STO 2024-09-19 572C @ 1.09; BTO 2024-09-19 580C @ 0.02
282024-10-2313:30:0014:30:00put standalone q82 rsi80 20, 0 bp OTM, $8-wide wings6$0.48$1.05$4,512.0035.23%$-342.00put timed close 14:30:00STO 2024-10-23 576P @ 0.51; BTO 2024-10-23 568P @ 0.03
292024-10-3110:30:0015:45:00put first, 10 bp OTM, $8-wide wings7$1.11$0.99$4,823.0038.69%$84.00put timed close 15:45:00STO 2024-10-31 571P @ 1.18; BTO 2024-10-31 563P @ 0.07
302024-11-0110:30:0011:00:00call first, 10 bp OTM, $8-wide wings7$0.87$0.42$4,991.0039.77%$315.00call profit target 50%STO 2024-11-01 576C @ 0.88; BTO 2024-11-01 584C @ 0.01
312024-11-0114:00:0015:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings6$0.63$0.20$4,422.0034.38%$258.00put profit target 50%STO 2024-11-01 571P @ 0.65; BTO 2024-11-01 563P @ 0.02
322024-11-0410:30:0012:00:00call first, 10 bp OTM, $8-wide wings7$0.65$0.11$5,145.0039.21%$378.00call profit target 50%STO 2024-11-04 573C @ 0.66; BTO 2024-11-04 581C @ 0.01
332024-11-0412:00:0013:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings7$0.78$0.24$5,054.0037.44%$378.00put profit target 50%STO 2024-11-04 568P @ 0.82; BTO 2024-11-04 560P @ 0.04
342024-11-0610:30:0011:00:00call first, 10 bp OTM, $8-wide wings7$0.79$0.28$5,047.0036.37%$357.00call profit target 50%STO 2024-11-06 590C @ 0.81; BTO 2024-11-06 598C @ 0.02
352024-11-1510:30:0015:45:00put first, 10 bp OTM, $8-wide wings7$0.77$1.28$5,061.0035.55%$-357.00put timed close 15:45:00STO 2024-11-15 586P @ 0.80; BTO 2024-11-15 578P @ 0.03
362024-12-2710:30:0014:00:00put first, 10 bp OTM, $8-wide wings7$1.13$0.37$5,159.0037.17%$532.00put profit target 50%STO 2024-12-27 592.5P @ 1.27; BTO 2024-12-27 584P @ 0.14
372024-12-3010:30:0011:00:00put first, 10 bp OTM, $8-wide wings8$1.19$0.46$5,448.0037.81%$584.00put profit target 50%STO 2024-12-30 584P @ 1.31; BTO 2024-12-30 576P @ 0.12
382024-12-3013:00:0015:00:00call followup rsi80 20, 0 bp OTM, $8-wide wings8$0.79$0.30$5,768.0038.47%$392.00call profit target 50%STO 2024-12-30 592C @ 0.80; BTO 2024-12-30 600C @ 0.01
392024-12-3110:30:0012:00:00call first, 10 bp OTM, $8-wide wings8$1.13$0.28$5,496.0035.72%$680.00call profit target 50%STO 2024-12-31 591C @ 1.17; BTO 2024-12-31 599C @ 0.04
402024-12-3113:00:0015:30:00put followup rsi80 20, 0 bp OTM, $8-wide wings8$0.84$0.40$5,728.0035.65%$352.00put profit target 50%STO 2024-12-31 586P @ 0.86; BTO 2024-12-31 578P @ 0.02
412025-03-0510:30:0013:00:00put first, 10 bp OTM, $8-wide wings10$2.00$0.44$6,000.0036.55%$1,560.00put profit target 50%STO 2025-03-05 575P @ 2.52; BTO 2025-03-05 567P @ 0.52
422025-03-0710:30:0014:00:00put first, 10 bp OTM, $8-wide wings11$1.81$0.50$6,809.0037.87%$1,441.00put profit target 50%STO 2025-03-07 571P @ 2.28; BTO 2025-03-07 563P @ 0.47
432025-03-1110:30:0015:00:00put first, 10 bp OTM, $8-wide wings13$2.04$0.14$7,748.0039.90%$2,470.00put profit target 50%STO 2025-03-11 555P @ 2.46; BTO 2025-03-11 547P @ 0.42
442025-03-2510:30:0012:00:00call first, 10 bp OTM, $8-wide wings11$0.52$0.19$8,228.0037.59%$363.00call profit target 50%STO 2025-03-25 577C @ 0.53; BTO 2025-03-25 585C @ 0.01
452025-03-2610:30:0015:45:00put first, 10 bp OTM, $8-wide wings12$0.64$3.71$8,832.0039.69%$-3,684.00put timed close 15:45:00STO 2025-03-26 572P @ 0.68; BTO 2025-03-26 564P @ 0.04
462025-03-2810:30:0015:45:00put first, 10 bp OTM, $8-wide wings11$1.44$3.65$7,216.0038.86%$-2,431.00put timed close 15:45:00STO 2025-03-28 559P @ 1.54; BTO 2025-03-28 551P @ 0.10
472025-03-3112:30:0014:00:00call standalone q82 rsi80 20, 0 bp OTM, $8-wide wings9$0.93$0.35$6,363.0039.43%$522.00call profit target 50%STO 2025-03-31 556C @ 0.95; BTO 2025-03-31 564C @ 0.02
482025-04-0212:30:0014:30:00call standalone q82 rsi80 20, 0 bp OTM, $8-wide wings10$1.93$0.70$6,070.0036.44%$1,230.00call profit target 50%STO 2025-04-02 565C @ 2.09; BTO 2025-04-02 573C @ 0.16
492025-04-0410:30:0015:45:00put first, 10 bp OTM, $8-wide wings9$2.58$3.24$6,678.0037.33%$-594.00put timed close 15:45:00STO 2025-04-04 515P @ 3.30; BTO 2025-04-04 505P @ 0.72
502025-04-0710:30:0014:00:00put first, 10 bp OTM, $8-wide wings14$3.06$0.53$6,916.0039.99%$3,542.00put profit target 50%STO 2025-04-07 497P @ 7.27; BTO 2025-04-07 489P @ 4.21
512025-04-1110:30:0012:00:00put first, 10 bp OTM, $8-wide wings15$2.54$1.02$8,190.0039.31%$2,280.00put profit target 50%STO 2025-04-11 520P @ 5.31; BTO 2025-04-11 512P @ 2.77
522025-04-1410:30:0012:00:00call first, 10 bp OTM, $8-wide wings15$2.10$0.38$8,850.0038.28%$2,580.00call profit target 50%STO 2025-04-14 543C @ 2.51; BTO 2025-04-14 551C @ 0.41
532025-04-1412:00:0014:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings16$1.82$0.45$9,888.0038.48%$2,192.00put profit target 50%STO 2025-04-14 535P @ 2.44; BTO 2025-04-14 527P @ 0.62
542025-04-2110:30:0015:45:00put first, 10 bp OTM, $8-wide wings18$1.89$2.96$10,998.0039.43%$-1,926.00put timed close 15:45:00STO 2025-04-21 515P @ 2.28; BTO 2025-04-21 507P @ 0.39
552025-04-2310:30:0012:00:00call first, 10 bp OTM, $8-wide wings17$1.97$0.42$10,251.0039.48%$2,635.00call profit target 50%STO 2025-04-23 545C @ 2.31; BTO 2025-04-23 553C @ 0.34
562025-04-2312:00:0014:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings17$1.59$0.77$10,897.0038.10%$1,394.00put profit target 50%STO 2025-04-23 536P @ 2.09; BTO 2025-04-23 528P @ 0.50
572025-04-2410:30:0015:45:00call first, 10 bp OTM, $8-wide wings19$1.95$3.54$11,495.0038.33%$-3,021.00call timed close 15:45:00STO 2025-04-24 543C @ 2.26; BTO 2025-04-24 551C @ 0.31
582025-04-2510:30:0012:00:00put first, 10 bp OTM, $8-wide wings17$1.73$0.56$10,659.0039.52%$1,989.00put profit target 50%STO 2025-04-25 544P @ 2.13; BTO 2025-04-25 536P @ 0.40
592025-04-2812:30:0014:00:00put standalone q82 rsi80 20, 0 bp OTM, $8-wide wings16$1.10$0.32$11,040.0038.12%$1,248.00put profit target 50%STO 2025-04-28 545P @ 1.18; BTO 2025-04-28 537P @ 0.08
602025-04-3013:00:0014:30:00call standalone q82 rsi80 20, 0 bp OTM, $8-wide wings17$1.04$1.24$11,832.0039.17%$-340.00call timed close 14:30:00STO 2025-04-30 551C @ 1.09; BTO 2025-04-30 559C @ 0.05
612025-05-0110:30:0013:00:00call first, 10 bp OTM, $8-wide wings18$1.47$0.52$11,754.0039.35%$1,710.00call profit target 50%STO 2025-05-01 563C @ 1.58; BTO 2025-05-01 571C @ 0.11
622025-05-0210:30:0015:45:00call first, 10 bp OTM, $8-wide wings18$1.23$0.83$12,186.0038.59%$720.00call timed close 15:45:00STO 2025-05-02 567C @ 1.29; BTO 2025-05-02 575C @ 0.06
632025-05-0710:30:0015:00:00call first, 10 bp OTM, $8-wide wings19$1.41$0.53$12,521.0038.77%$1,672.00call profit target 50%STO 2025-05-07 563C @ 1.56; BTO 2025-05-07 571C @ 0.15
642025-05-2710:30:0015:45:00call first, 10 bp OTM, $8-wide wings18$0.57$1.50$13,374.0039.37%$-1,674.00call timed close 15:45:00STO 2025-05-27 589C @ 0.59; BTO 2025-05-27 597C @ 0.02
652025-06-0410:30:0013:00:00call first, 10 bp OTM, $8-wide wings17$0.51$0.15$12,733.0039.43%$612.00call profit target 50%STO 2025-06-04 599C @ 0.53; BTO 2025-06-04 607C @ 0.02
662025-06-1810:30:0015:00:00call first, 10 bp OTM, $8-wide wings18$1.02$0.08$12,564.0038.18%$1,692.00call profit target 50%STO 2025-06-18 602C @ 1.06; BTO 2025-06-18 610C @ 0.04
672025-10-1510:30:0012:00:00call first, 10 bp OTM, $8-wide wings18$0.58$0.08$13,356.0038.60%$900.00call profit target 50%STO 2025-10-15 671C @ 0.60; BTO 2025-10-15 679C @ 0.02
682025-10-1513:00:0015:00:00put followup rsi80 20, 0 bp OTM, $8-wide wings20$0.92$0.15$14,160.0039.89%$1,540.00put profit target 50%STO 2025-10-15 663P @ 1.01; BTO 2025-10-15 655P @ 0.09
692025-12-1810:30:0013:00:00call first, 10 bp OTM, $8-wide wings20$0.91$0.35$14,180.0038.28%$1,120.00call profit target 50%STO 2025-12-18 680C @ 0.92; BTO 2025-12-18 688C @ 0.01
702026-03-0310:30:0012:00:00put first, 10 bp OTM, $8-wide wings24$1.70$0.12$15,120.0039.62%$3,792.00put profit target 50%STO 2026-03-03 669P @ 2.04; BTO 2026-03-03 661P @ 0.34
712026-03-0314:00:0015:30:00call followup rsi80 20, 0 bp OTM, $8-wide wings23$0.74$0.35$16,698.0039.80%$897.00call profit target 50%STO 2026-03-03 682C @ 0.76; BTO 2026-03-03 690C @ 0.02
722026-03-0410:30:0015:30:00call first, 10 bp OTM, $8-wide wings24$1.09$0.31$16,584.0038.70%$1,872.00call profit target 50%STO 2026-03-04 687C @ 1.11; BTO 2026-03-04 695C @ 0.02
732026-03-0510:30:0015:45:00put first, 10 bp OTM, $8-wide wings27$1.43$0.58$17,739.0039.67%$2,295.00put profit target 50%STO 2026-03-05 680P @ 1.67; BTO 2026-03-05 672P @ 0.24
742026-03-0912:30:0013:30:00call standalone q82 rsi80 20, 0 bp OTM, $8-wide wings26$0.93$0.31$18,382.0039.10%$1,612.00call profit target 50%STO 2026-03-09 672C @ 0.98; BTO 2026-03-09 680C @ 0.05
752026-03-1210:30:0015:30:00put first, 10 bp OTM, $8-wide wings30$1.58$0.32$19,260.0039.61%$3,780.00put profit target 50%STO 2026-03-12 667P @ 1.83; BTO 2026-03-12 659P @ 0.25
762026-03-1810:30:0015:45:00put first, 10 bp OTM, $8-wide wings32$1.61$3.09$20,448.0039.02%$-4,736.00put timed close 15:45:00STO 2026-03-18 665P @ 1.81; BTO 2026-03-18 657P @ 0.20
772026-03-1910:30:0012:00:00put first, 10 bp OTM, $8-wide wings28$1.32$0.53$18,704.0039.23%$2,212.00put profit target 50%STO 2026-03-19 655P @ 1.48; BTO 2026-03-19 647P @ 0.16
782026-03-2710:30:0015:45:00put first, 10 bp OTM, $8-wide wings30$1.45$3.90$19,650.0039.39%$-7,350.00put timed close 15:45:00STO 2026-03-27 638P @ 1.64; BTO 2026-03-27 630P @ 0.19
792026-04-0910:30:0012:00:00put first, 10 bp OTM, $8-wide wings23$0.67$0.12$16,859.0039.64%$1,265.00put profit target 50%STO 2026-04-09 673P @ 0.77; BTO 2026-04-09 665P @ 0.10
802026-04-0912:00:0015:00:00call followup rsi80 20, 0 bp OTM, $8-wide wings23$0.68$0.30$16,836.0038.44%$874.00call profit target 50%STO 2026-04-09 680C @ 0.72; BTO 2026-04-09 688C @ 0.04
812026-04-1510:30:0015:45:00call first, 10 bp OTM, $8-wide wings23$0.54$1.66$17,158.0038.41%$-2,576.00call timed close 15:45:00STO 2026-04-15 698C @ 0.57; BTO 2026-04-15 706C @ 0.03
822026-05-0510:30:0015:45:00call first, 10 bp OTM, $8-wide wings23$0.74$0.94$16,698.0039.67%$-460.00call timed close 15:45:00STO 2026-05-05 724C @ 0.76; BTO 2026-05-05 732C @ 0.02
832026-05-0710:30:0013:00:00call first, 10 bp OTM, $8-wide wings22$0.51$0.07$16,478.0039.58%$968.00call profit target 50%STO 2026-05-07 736C @ 0.54; BTO 2026-05-07 744C @ 0.03
842026-05-1410:30:0015:45:00call first, 10 bp OTM, $8-wide wings23$0.84$1.60$16,468.0038.65%$-1,748.00call timed close 15:45:00STO 2026-05-14 747C @ 0.86; BTO 2026-05-14 755C @ 0.02

Important Notes

This is a historical paper/research report, not live trading performance. Results depend on ThetaData historical option bid/ask snapshots, the specific entry/exit rules above, and the risk-cap sizing model.

The strategy is defined-risk per spread, but the 40% risk cap is aggressive. A worst-case same-day move can still produce large account drawdowns.