Scan: Will Starbucks Credit Card Spend for September 2026 be above 102 ?

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: kalshi_direct kalshi_related resolution_source claude_news article_search earnings_data fred polymarket_related

Sub-questions (Fermi decomposition)

What is the Carbon Arc Starbucks Credit Card Spend index methodology — what base period equals 100, and is it a YoY spend index or a level index?
What were the Carbon Arc Starbucks Credit Card Spend readings for the most recent months (e.g., June, July, August 2026), and what is the month-to-month volatility?
What do Kalshi's other KXSBUXCC strike markets (e.g., T100, T104, T106) imply about the market's distribution for the September 2026 reading?
What was Starbucks' most recent reported North America comparable store sales / transaction growth, and what guidance has management given for the quarter covering September 2026?
Have there been September 2026 promotions, menu launches (Pumpkin Spice timing), price changes, or operational disruptions (strikes, closures) that would materially shift card spend versus prior months?
How is aggregate US consumer credit card / restaurant spending trending in Q3 2026 per Fed and Census data?

Planner reasoning

This resolves on a proprietary Carbon Arc alternative-data index of Starbucks credit card spend for September 2026 with a 102 threshold, so the key unknowns are the index's methodology/baseline (what 100 means, whether it's YoY-indexed or level-indexed), the recent trajectory of prior months' readings, and Starbucks' underlying US same-store sales momentum. The Kalshi price and sibling threshold markets in the same KXSBUXCC series give the market-implied distribution, while SBUX earnings/comps news and consumer spending data inform the fundamentals.

2. Research Parallel tool calls

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data Above 102 (KXSBUXCC-26OCT07-T102) - Current price (probability): 52.00% - 7-day price change: +0.00% - 30-day price change: +5.00% - Average daily volume: 855 contracts - Price range: 47.00% - 52.00% - Data points: 11 days
kalshi_related	OK	1.7s	1	1 related markets / summaries. series KXSBUXCC: 0 markets (skipped 9 no-signal) \| keyword 'Starbucks credit card spend': ok \| keyword 'Carbon Arc': no matches
resolution_source	OK	2.8s	1	already_resolved=unclear; matches_criteria=False; last_updated=unknown. The fetched page only shows generic Carbon Arc homepage marketing text about being 'The Infrastructure for the AI Economy' with no data on Starbucks Credit Card Spend index values.
claude_news	OK	20.6s	10	Based on available research, here's what I found on the Carbon Arc Starbucks Credit Card Spend index and related Kalshi (KXSBUXCC) market activity: - Index methodology (limited direct data found): The underlying data is sourced from Carbon Arc, a data vendor whose card-spend series are indexed
article_search	OK	0.8s	24	Fetched 24 unique articles across 4 queries (lookback=60d). 'Starbucks September 2026 sales comparable store transactions': 10 articles \| 'Starbucks credit card spending data Carbon Arc': 10 articles \| 'Starbucks Q4 fiscal 2026 guidance Brian Niccol turnaround': 10 articles \| 'Starbucks pumpkin spic
earnings_data	OK	0.4s	1	Fetched FMP data for 1 ticker(s).
fred	OK	2.8s	6	Fetched 6 FRED series (lookback=400d) (via search 'food services and drinking places retail sales').
polymarket_related	OK	0.5s	0	Polymarket search over 1 keyword(s), kept 0 matches. keyword 'Starbucks': 0 markets

3. Evidence Brief Sonnet 5 · 6326 chars

# Event Will the Carbon Arc Starbucks Credit Card Spend index for September 2026 be above 102? # Outcomes to forecast - Yes (index > 102) - No (index ≤ 102) # Kalshi market anchor **Current YES price: 52%** (KXSBUXCC-26OCT07-T102). 7-day change: +0.00%; 30-day change: +5.00% (rose from ~47% to 52%). Average daily volume: 855 contracts over 11 data points — moderate liquidity relative to other Carbon-Arc KPI markets, but note comparable August contract reportedly settled/traded with zero real volume at open, suggesting thin price discovery is common in this series. [kalshi_direct] # Resolution source Attempted fetch of Carbon Arc's site (carbonarc.co) returned only generic marketing homepage content ("Infrastructure for the AI Economy") — no index values disclosed. Kalshi's market page fetch failed (HTTP 429). No resolving data or historical print is currently accessible from open sources; the index appears to be proprietary/licensed data disclosed only via Kalshi settlement. [resolution_source] # Sub-question answers 1. **Index methodology (base=100, YoY or level?)** — Not documented in accessible sources. Carbon Arc's spend indices appear to be normalized/entity-indexed values (not raw dollars), built on a common "ontology" framework across companies, but no explicit base-period definition for the Starbucks series was found. [claude_news] 2. **Recent monthly readings (Jun/Jul/Aug 2026)** — Not available. No settlement/historical print data was found for any KXSBUXCC month; Octagon page noted "no historical resolution data available." The August 2026 contract's price gapped to 56% on a single trading day with zero real volume, reportedly reacting to strong Q3 earnings — not to an actual observed spend reading. [claude_news] 3. **Other KXSBUXCC strikes (T100/T104/T106)** — kalshi_related search found no active KXSBUXCC sibling markets with signal (series returned "0 markets, skipped 9 no-signal"), so no cross-strike distribution could be derived. 4. **SBUX North America comps / guidance** — Q3 FY26 (ended June 28, 2026): global comps +7.9%, EPS $0.85 adj (vs $0.66 est.), revenue $9.32B. Full-year guidance raised: U.S. comps "slightly greater than 6%," global comps "nearing 6%." Management guided Q4 U.S. comp growth of "6.5% or greater." North America margins expanded for first time in 2+ years. [CNBC, 2026-07-29/30] 5. **September 2026 promotions/disruptions** — No specific September 2026 promotion, PSL timing, price change, or strike/closure event was surfaced in the 60-day article search; one CNBC piece from 2026-09-16 references Fed rate action and "what's moving Starbucks" but content was truncated with no operational detail captured. 6. **Aggregate consumer spending trend (Q3 2026)** — Food services & drinking places retail sales (FRED RSFSDP/MRTSSM722USS) rose steadily: $100.2B (Feb) → $103.3B (Jun) → $103.8B (Jul) → $105.1B (Aug), a clear uptrend. Revolving consumer credit (REVOLSL) also trending up ($1.31T→$1.36T Jan–Jul 2026). Consumer sentiment (UMCSENT) is choppy/low (44.8–56.6 range in 2026), well below historical norms, indicating cautious consumers despite continued nominal spend growth. [FRED] # Key facts (high-confidence, factual) 1. [kalshi_direct] YES price for T102 strike = 52%, up 5pts in 30 days, avg volume 855/day. 2. [CNBC 2026-07-29] SBUX Q3 FY26 global comps +7.9%, U.S. comps guidance raised to "slightly greater than 6%" for FY26. 3. [CNBC 2026-07-30] Comp growth driven by higher transactions, add-on customization, food attach — consistent with rising per-visit spend. 4. [FRED] Food-service retail sales (NSA & SA) show consistent MoM growth through Aug 2026, the latest available print. 5. [claude_news] No confirmed historical KXSBUXCC settlement values exist in accessible research; August contract price was essentially an unpriced opening quote, not a data-informed consensus. # Cross-market signals - Kalshi related: No other KXSBUXCC strikes returned usable signal; keyword search returned unrelated markets (solar tax credit, gov't spending cuts, habeas corpus) — no genuine cross-market read. - Polymarket: No matching markets found (0 results). - Sportsbook implied: N/A (not applicable to this event type). # Analyst opinions and speculation - Wall St. sell-side raised price targets on SBUX post-Q3 earnings citing turnaround momentum (CNBC 2026-07-29/08-03); one bear-to-neutral upgrade noted "turnaround is real... but price already reflects a lot of it." - Cramer (2026-07-30) bullish on breakout given comps/profit acceleration under CEO Niccol. - claude_news synthesis explicitly flags that August's 56% market price reflected earnings-driven sentiment repricing, not an actual observed spend index — same dynamic likely applies to September's 52% price, meaning the market may be extrapolating strong SBUX fundamentals rather than pricing a specific card-spend data point. # Directional lean per outcome - **Yes (>102):** Supported by strong SBUX comp growth (+7.9% Q3, guided ~6%+ for FY26), rising food-service aggregate spend (FRED), and momentum-driven bullish narrative reflected in the 52% (up from 47%) market price. - **No (≤102):** Supported by lack of any confirmed prior monthly index print near/above 102 (no baseline established), weak/volatile consumer sentiment (UMCSENT near cyclical lows), thin liquidity/price-discovery concerns (August contract had ~0 real trading volume despite a headline price), and total absence of verified index methodology — meaning the 102 threshold's difficulty is unknown and could be calibrated well above typical monthly readings. # Gaps / unknowns - No confirmed index base/methodology or units (level vs. YoY) — critical for interpreting "102." - No historical KXSBUXCC settlement values (June/July/August 2026) obtained. - No visibility into September-specific SBUX promotions, price changes, or disruptions. - Kalshi market page itself was inaccessible (429 error) for corroboration beyond kalshi_direct tool. # Calibration anchors - Kalshi current YES price: 52% (primary anchor). - Precedent: August 2026 KXSBUXCC contract opened directly at 56% with zero real trading volume — implies these markets are prone to sentiment-driven mispricing absent genuine data-informed trading, warranting caution against over-trusting current 52% as a refined consensus.

4. Forecasters 5 draws · Fable 5.1 + GPT-5.6 Sol

claude-fable-5-1

32% conf

Yes	55%
No	45%

The Kalshi anchor sits at 52% YES (up from 47% over 30 days), but the brief notes this series has thin, sentiment-driven price discovery with no verified historical prints or methodology, so the anchor carries limited information. Fundamentals modestly favor YES: SBUX Q3 FY26 comps were +7.9% with Q4 U.S. comp guidance of 6.5%+, driven by higher transactions and ticket, and FRED food-service sales rose steadily through August 2026 — if the index is a YoY-normalized spend measure, these point to readings above 102. Offsetting this, the 102 threshold's difficulty is unknown (strike ladder T100–T106 suggests it is near the expected center), consumer sentiment is weak, and no September-specific data exists. I therefore lean only slightly above the market at 55% YES.

claude-fable-5-1

22% conf

Yes	53%
No	47%

The Kalshi anchor sits at 52% YES (up from ~47% over 30 days), but the brief flags that this series has thin, sentiment-driven price discovery (the August contract opened at 56% with essentially zero volume), so the anchor is not a refined consensus. Fundamentals tilt mildly positive: SBUX Q3 FY26 global comps +7.9%, Q4 U.S. comps guided '6.5% or greater,' and FRED food-service retail sales rose steadily through August 2026. However, the index methodology, base period, and all prior monthly prints are unknown, so the difficulty of the 102 threshold cannot be assessed, and consumer sentiment remains near cyclical lows. Net: a near coin-flip with a slight lean to Yes on fundamentals, staying close to the market anchor.

claude-fable-5-1

28% conf

Yes	54%
No	46%

The Kalshi anchor sits at 52% YES (up from ~47% over 30 days), and there is no accessible historical print or methodology for the Carbon Arc Starbucks index, so the threshold's difficulty is essentially unknown. Fundamentals lean modestly positive: SBUX Q3 FY26 global comps +7.9%, U.S. comp guidance raised to 6%+ with Q4 guided at 6.5%+, and FRED food-service sales rising steadily through August — if the index is a YoY-style measure around base 100, September readings above 102 are plausible. Offsetting this, the market's price discovery is thin (August contract traded at ~0 volume) and weak consumer sentiment plus unknown index calibration argue against departing far from the anchor. I tilt slightly toward Yes on the strength of comps but stay close to the market.

gpt-5.6-sol

38% conf

Yes	55%
No	45%

The 52% Kalshi YES price is the primary anchor, though thin price discovery and the sentiment-driven August contract reduce its reliability. Starbucks’ 7.9% global comp growth, guidance for at least 6.5% Q4 U.S. comps, and transaction-led gains modestly favor an index above 102. Rising food-service sales through August and expanding revolving credit reinforce that lean, while no identified September disruption offsets it. However, unavailable methodology, historical readings, and sibling strikes make the threshold’s actual difficulty highly uncertain, limiting the move from the market anchor.

gpt-5.6-sol

43% conf

Yes	55%
No	45%

The 52% Kalshi YES price is the primary anchor, though thin price discovery limits its informativeness. Starbucks’ strong Q3 global comps of 7.9%, guidance for Q4 U.S. comps of at least 6.5%, and rising food-service spending through August modestly favor an index above 102. However, no historical index readings or methodology are available, so it is impossible to determine how demanding the threshold is, while weak consumer sentiment adds downside risk. These factors justify only a small upward adjustment from the market price.

6. Final plain mean of 5 draws

54% (33% confidence)

Yes: 54% No: 46%

Mean of 5 draws (0.55, 0.53, 0.54, 0.55, 0.55). The Kalshi anchor sits at 52% YES (up from 47% over 30 days), but the brief notes this series has thin, sentiment-driven price discovery with no verified historical prints or methodology, so the anchor carries limited information. Fundamentals modestly favor YES: SBUX Q3 FY26 comps were +7.9% with Q4 U.S. comp guidance of 6.5%+, driven by higher transactions and ticket, and FRED food-service sales rose steadily through August 2026 — if the index is a YoY-normalized spend measure, these point to readings above 102. Offsetting this, the 102 threshold's difficulty is unknown (strike ladder T100–T106 suggests it is near the expected center), consumer sentiment is weak, and no September-specific data exists. I therefore lean only slightly above the market at 55% YES.

Pipeline Timing

Total pipeline time: 85.5s

Per-tool research timings shown in the Research section above.