Scan: Will Starbucks Credit Card Spend for September 2026 be above 101 ?

1. Planner Fable 5.1 · Fermi decomposition + tool plan

Tools chosen: kalshi_direct kalshi_related resolution_source claude_news article_search gdelt_news earnings_data fred polymarket_related

Sub-questions (Fermi decomposition)

What were the Carbon Arc Starbucks Credit Card Spend index values for the most recent months (e.g., June, July, August 2026), and what is the month-to-month trend and volatility?
How is the Carbon Arc index constructed (base period = 100? year-over-year spend index?), and what did the September 2025 print look like relative to August 2025 (seasonality of the fall/PSL launch)?
What did Starbucks report for North America comparable sales, transactions, and ticket in its most recent earnings (fiscal Q3 2026, reported ~late July/Aug 2026), and what guidance/commentary was given for the September quarter?
How are the other strike thresholds in the KXSBUXCC-26OCT07 Kalshi ladder priced, and what implied distribution do they give for the September 2026 print?
Were there Starbucks menu price increases, promotions, loyalty changes, or store closures in Aug–Sep 2026 that would shift card spend up or down?
What do macro indicators (US retail sales at food services/drinking places, consumer sentiment) show for August–September 2026 consumer discretionary spending?
Has Carbon Arc or Kalshi already published the September 2026 value or a preliminary read on the resolution source?

Planner reasoning

This is a niche alternative-data market: the Carbon Arc Starbucks Credit Card Spend index for September 2026 vs a 101 threshold. The key is understanding how the index is constructed (base = 100? YoY?), what recent monthly prints have been, and how Kalshi's own ladder of thresholds prices the distribution. Starbucks' 'Back to Starbucks' turnaround, latest comp-sales/transaction data, fall seasonal launch (PSL), pricing actions, and macro consumer spending in September 2026 are the drivers of whether spend lands above 101.

2. Research Parallel tool calls

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data Above 101 (KXSBUXCC-26OCT07-T101) - Current price (probability): 60.00% - 7-day price change: -8.00% - 30-day price change: -5.00% - Average daily volume: 886 contracts - Price range: 46.00% - 68.00% - 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	3.5s	1	already_resolved=unclear; matches_criteria=False; last_updated=unknown. The fetched page is Carbon Arc's general homepage marketing content and does not display any specific data series or numeric value for Starbucks Credit Card Spend for September 2026.
claude_news	OK	19.9s	9	Based on available search results, here's what I found on the Carbon Arc/Kalshi Starbucks Credit Card Spend index: - Index construction is opaque/unconfirmed: Third-party analysis explicitly notes details on the specific credit card spend index are unavailable, and while the market refers to a
article_search	OK	1.3s	21	Fetched 21 unique articles across 4 queries (lookback=75d). 'Starbucks same-store sales transactions September 2026': 10 articles \| 'Starbucks fiscal Q3 2026 earnings North America comparable sales': 10 articles \| 'Starbucks price increase promotion fall 2026 Pumpkin Spice Latte launch': 10 articles
gdelt_news	OK	180.0s	20	GDELT: 20 articles across 3 queries (lookback=45d). 'Starbucks sales September 2026': 10 hits \| 'Starbucks Back to Starbucks turnaround traffic': error GDELT rate-limited after retries (429) \| 'Starbucks card spend Carbon Arc': 10 hits
earnings_data	OK	0.5s	1	Fetched FMP data for 1 ticker(s).
fred	OK	37.8s	6	Fetched 6 FRED series (lookback=400d) (via search 'retail sales food services and drinking places').
polymarket_related	OK	0.6s	0	Polymarket search over 1 keyword(s), kept 0 matches. keyword 'Starbucks': 0 markets

3. Evidence Brief Sonnet 5 · 5887 chars

# Event Will the Carbon Arc Starbucks Credit Card Spend index for September 2026 close above 101? # Outcomes to forecast - Yes (index > 101) - No (index ≤ 101) # Kalshi market anchor **Current YES price: 60%** (KXSBUXCC-26OCT07-T101). Trend: -8% over 7 days, -5% over 30 days — market has been drifting down from a recent high. 30-day range 46%–68%. Average daily volume ~886 contracts (moderate liquidity, real trading interest). [kalshi_direct] # Resolution source Carbon Arc's homepage (carbonarc.co) was fetched but shows only generic marketing content — no dashboard or numeric index value for Sept 2026 is publicly visible. Kalshi's own market page could not be fetched (HTTP 429). Status: unresolved/unclear, no evidence the print has been published yet. [resolution_source] # Sub-question answers 1. **Recent monthly index values/trend** — Not found. No June/July/August 2026 Carbon Arc index values surfaced in any source; a related Kalshi contract "Starbucks Monthly Credit Card Spend in August" existed but had zero trading volume, so its 56% opening price is not informative. [claude_news] 2. **Index construction / Sept 2025 vs Aug 2025 seasonality** — Methodology is not publicly documented; likely a proprietary base-100 (YoY or indexed) series, but no confirmation, and no September 2025 seasonal comparison data was found. [claude_news] 3. **Q3 FY26 earnings (reported July 29, 2026)** — Very strong: global comps +7.9%, North America (US+Canada) comps +8.1%, US comps +7.9% driven by both transactions and ticket; adjusted EPS $0.85 (beat $0.66 est.); FY26 guidance raised to ~6% global / >6% US comps growth, EPS $2.55–$2.65. NA margins expanded for first time in 2+ years. [article_search/CNBC] 4. **Other ladder thresholds** — Not available; kalshi_related search returned no other KXSBUXCC strikes with signal (9 markets skipped as no-signal). 5. **Menu/promo/loyalty changes Aug–Sep 2026** — Pumpkin Spice Latte relaunched Aug 25, 2026 (seasonal demand driver); Starbucks Rewards program changed Sept 3, 2026 making free drinks harder to earn (potentially pushes more direct paid card spend, or could suppress visit frequency); 200+ job cuts announced Aug 27, 2026 amid restructuring; union boycott calls also emerged late Aug 2026. [gdelt_news] 6. **Macro consumer spending Aug–Sep 2026** — US retail sales at food services & drinking places (RSFSDP) rose steadily: June $103.3B → July $103.8B → Aug $105.1B (accelerating). Consumer sentiment (UMCSENT) recovering but still weak: 44.8 (May) → 49.5 (June) → 55.2 (July 2026), well below Aug 2025's 58.2. [FRED] 7. **Has Sept 2026 value been published?** — No; Carbon Arc source page shows no data, and no article/tool confirms a preliminary or final September print. # Key facts (high-confidence, factual) 1. Kalshi YES (Above 101) = 60%, trending down (-8% 7d, -5% 30d). [kalshi_direct] 2. SBUX Q3 FY26 comps +7.9% global, +8.1% NA; guidance raised; stock +25% YTD as of Aug 2026. [article_search] 3. Restaurant/food-service retail sales (FRED RSFSDP) rising steadily through Aug 2026 ($105.07B, up from $99.8B a year prior). [fred] 4. Starbucks Rewards devaluation effective Sept 3, 2026; PSL relaunched Aug 25, 2026. [gdelt_news] 5. No public/verifiable Carbon Arc index values exist in research for any 2026 month. [claude_news, resolution_source] # Cross-market signals - Kalshi related: No other KXSBUXCC strike data with signal found; a same-family "August" Carbon Arc contract had essentially zero trading volume (56% opening quote, not meaningful). [claude_news] - Polymarket: No matching markets found. [polymarket_related] - Sportsbook implied: N/A (not applicable to this category). # Analyst opinions and speculation - Octagon AI commentary (unofficial, no Kalshi affiliation) speculates August pricing reflected optimism from strong Q3 earnings, but flags total absence of trading conviction (zero volume) as a caveat. [claude_news] - CNBC/Cramer bullish narrative around Niccol turnaround ("Starbucks is back," Sept 10, 2026) cites broad-based comp growth across demographics/income/rewards status. [article_search] - A Thailand-specific Starbucks/JCB campaign (Jul–Sep 2026) is cited as a potential (minor, non-US) seasonal spend booster — of uncertain relevance if index is US-focused. # Directional lean per outcome - **Yes (>101)**: Supported by strong US comp sales momentum (+7.9%), raised guidance, accelerating US food-service retail sales trend, and PSL seasonal launch. Opposed by: recent 7d/30d decline in Kalshi price itself (smart money softening), Rewards devaluation potentially denting loyalty-driven spend, still-weak consumer sentiment (55 vs ~58 a year earlier), and total lack of verified index base/level data making "101" threshold significance unclear. - **No (≤101)**: Supported by market's downward price drift, uncertain index construction (if 100=YoY flat, 101 may require above-average YoY growth which is plausible given comps, but if base is different this is untestable), and weak sentiment. Opposed by broadly positive fundamentals. # Gaps / unknowns - No actual historical Carbon Arc index values or exact index definition/base period found — cannot independently model distribution. - No confirmation of whether Sept 2026 data has been (or will be) published before close (Oct 7, 2026). - No visibility into other Kalshi ladder strikes to infer implied distribution shape. - Kalshi.com market page inaccessible (429 error) — could not verify live orderbook depth beyond kalshi_direct snapshot. # Calibration anchors - Kalshi current YES price: 60% (primary anchor), down from 68% high in the 30-day window. - Precedent: SBUX comps have printed +7-8% for consecutive quarters, suggesting continued elevated (>100 base) YoY spend growth is plausible, but index-specific historical volatility is unknown, limiting confidence beyond the market-implied anchor.

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

claude-fable-5-1

33% conf

Yes	58%
No	42%

The Kalshi anchor sits at 60% YES but has drifted down 8 points over the past week (30-day range 46–68%), suggesting softening conviction without a clear catalyst in the brief. Fundamentals lean positive: SBUX Q3 FY26 US comps +7.9%, raised guidance, accelerating FRED food-service retail sales through August, and the PSL seasonal launch on Aug 25 — if the Carbon Arc index is a base-100 YoY series, high-single-digit comp growth would plausibly clear 101. However, the index methodology and all historical values are unverified, the Sept 3 Rewards devaluation and weak consumer sentiment (55 vs 58 a year prior) are mild headwinds, and the Sept 2026 print has not been published. With no information the market lacks, I stay close to the anchor, shading slightly toward the recent downward drift.

claude-fable-5-1

33% conf

Yes	60%
No	40%

The Kalshi YES price of 60% is the primary anchor, though it has drifted down 8 points over 7 days from a 68% high, indicating softening conviction. Fundamentals lean positive: SBUX Q3 FY26 US comps +7.9% with raised guidance, FRED food-service retail sales accelerating through August 2026 ($105.1B vs $99.8B a year prior), and the PSL relaunch on Aug 25 supports September spend. Offsetting factors include the Sept 3 Rewards devaluation, weak consumer sentiment (55 vs 58 a year earlier), and critically the total absence of any published Carbon Arc index values or methodology, so the significance of the 101 strike cannot be independently modeled and the market's placement near the middle of its ladder implies genuine uncertainty. With no information the market hasn't priced, I stay at the anchor.

claude-fable-5-1

33% conf

Yes	60%
No	40%

Kalshi prices YES at 60%, and the brief provides no verified Carbon Arc index values or methodology that would justify a large departure from that consensus. Fundamentals lean supportive of YES: Q3 FY26 US comps +7.9% with both traffic and ticket growth, raised guidance, accelerating FRED food-service retail sales through August, and the PSL launch in late August. Offsetting factors are the market's -8% 7-day drift, the Sept 3 Rewards devaluation, weak consumer sentiment, and the fundamental uncertainty about what '101' means in this proprietary index. Net, I anchor on the market at roughly 0.60 YES.

gpt-5.6-sol

44% conf

Yes	61%
No	39%

The 60% Kalshi YES price is the primary anchor, though its 8-point weekly decline provides a modest negative signal. Strong Starbucks fundamentals—US comparable sales up 7.9%, raised guidance, and rising food-service spending through August—point toward Yes, while the August 25 pumpkin-spice launch adds seasonal support. The September Rewards devaluation, weak consumer sentiment, and restructuring or boycott headlines modestly temper that positive case. With no historical Carbon Arc values, documented methodology, related strike signals, or published September print, there is little basis to move far from the market consensus.

gpt-5.6-sol

43% conf

Yes	60%
No	40%

The 60% Kalshi YES price is the best anchor because no historical Carbon Arc values, methodology, or informative adjacent strikes are available. Strong Starbucks momentum—US comps up 7.9%, raised guidance, and rising food-service sales—points toward Yes, with the August 25 PSL launch providing an additional September tailwind. However, weak consumer sentiment, the Rewards devaluation, boycott noise, and the market's recent downward drift support meaningful No risk. With no published September value and no way to interpret precisely what 101 represents, the available fundamentals do not justify moving away from the market consensus.

6. Final plain mean of 5 draws

60% (37% confidence)

Yes: 60% No: 40%

Mean of 5 draws (0.58, 0.60, 0.60, 0.61, 0.60). The Kalshi anchor sits at 60% YES but has drifted down 8 points over the past week (30-day range 46–68%), suggesting softening conviction without a clear catalyst in the brief. Fundamentals lean positive: SBUX Q3 FY26 US comps +7.9%, raised guidance, accelerating FRED food-service retail sales through August, and the PSL seasonal launch on Aug 25 — if the Carbon Arc index is a base-100 YoY series, high-single-digit comp growth would plausibly clear 101. However, the index methodology and all historical values are unverified, the Sept 3 Rewards devaluation and weak consumer sentiment (55 vs 58 a year prior) are mild headwinds, and the Sept 2026 print has not been published. With no information the market lacks, I stay close to the anchor, shading slightly toward the recent downward drift.

Pipeline Timing

Total pipeline time: 254.8s

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