Scan: Will Amazon Credit Card Spend for September 2026 be above 110 ?

1. Planner Fable 5.1 · Fermi decomposition + tool plan

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

Sub-questions (Fermi decomposition)

What is the current Kalshi YES price for the T110 strike, and what probability distribution do the sibling strikes in KXAMZNCC-26OCT07 imply for the September 2026 print?
What were the most recent published Carbon Arc Amazon Credit Card Spend index values (e.g., August 2026, July 2026, and September 2025), and what is the index's base period so that 110 can be translated into an implied YoY/MoM growth rate?
What is the typical August-to-September seasonal change in Amazon card spend, and did Amazon hold a Prime Big Deal Days or comparable promotional event in September 2026 (versus October) that would inflate the September figure?
What growth did Amazon report for North America/online stores in its most recent quarter (Q2 2026) and what guidance did it give for Q3 2026?
What do US retail sales and e-commerce data (FRED) show about consumer spending momentum through mid-2026, and are there tariff, inflation, or labor-market shocks in September 2026 affecting online spending?
How have prior KXAMZNCC monthly markets resolved relative to their thresholds — does the index tend to print above or below market-implied levels?

Planner reasoning

This is a numeric threshold question on a niche alternative-data index (Carbon Arc Amazon Credit Card Spend) for September 2026. The key is anchoring on the Kalshi price, reconstructing the implied distribution from sibling thresholds in the same event, and learning the index's recent levels, base period, and seasonality (September typically dips after summer/Prime Day unless an October-style Prime Big Deal Days event shifts into September). Macro retail/e-commerce trends and Amazon's own reported growth supply secondary signals.

2. Research Parallel tool calls

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data Above 110 (KXAMZNCC-26OCT07-T110) - Current price (probability): 56.00% - 7-day price change: +2.00% - 30-day price change: +0.00% - Average daily volume: 802 contracts - Price range: 51.00% - 60.00% - Data points: 13 days
kalshi_related	OK	1.7s	1	1 related markets / summaries. series KXAMZNCC: 0 markets (skipped 9 no-signal) \| keyword 'Amazon credit card spend': ok \| keyword 'Carbon Arc': no matches
resolution_source	OK	4.0s	1	already_resolved=unclear; matches_criteria=False; last_updated=unknown. The fetched page is Carbon Arc's homepage marketing content describing itself as 'The Infrastructure for the AI Economy'; it contains no data on Amazon Credit Card Spend index values for September 2026 or any historical index fi
article_search	OK	46.7s	33	Fetched 33 unique articles across 4 queries (lookback=60d). 'Carbon Arc Amazon credit card spend index': 10 articles \| 'Amazon September 2026 sales consumer spending': 10 articles \| 'Amazon Prime Big Deal Days 2026 date': 10 articles \| 'US online retail spending September 2026': 10 articles
claude_news	OK	24.1s	8	Based on available search results, here are the key findings: - Data source & methodology: The market resolves based on data for Amazon's monthly credit card spend, as reported by the settlement source, Carbon Arc . Carbon Arc is a data platform that turns trillions of real-world observations
earnings_data	OK	0.5s	1	Fetched FMP data for 1 ticker(s).
fred	OK	2.3s	6	Fetched 6 FRED series (lookback=730d) (via search 'nonstore retailers sales').
polymarket_related	OK	0.5s	5	Polymarket search over 3 keyword(s), kept 5 matches. keyword 'Amazon': 5 markets \| keyword 'consumer spending': 0 markets \| keyword 'retail sales': 0 markets
code_execution	OK	43.6s	0	Important caveat: The prompt referenced a `kalshi_related` YES-price table for the KXAMZNCC‑26OCT07 strikes, but no actual price data was included in this conversation. The figures below were produced by running the full de‑vig/CDF methodology on a representative, illustrative strike‑price l

3. Evidence Brief Sonnet 5 · 6137 chars

# Event Will the Carbon Arc Amazon Credit Card Spend Index for September 2026 print above 110? # Outcomes to forecast - Yes (index > 110) - No (index ≤ 110) # Kalshi market anchor **KXAMZNCC-26OCT07-T110: YES = 56%** (current). 7-day change: +2pp. 30-day change: flat. Avg daily volume: 802 contracts. 13-day price range: 51%–60%. Market is leaning modestly toward YES but well within coin-flip range. [kalshi_direct] # Resolution source Attempted fetch of Carbon Arc's site returned only marketing homepage content ("Infrastructure for the AI Economy") — no index data accessible; Kalshi market page itself returned HTTP 429. Status: unresolved/unclear, no numeric September 2026 print available yet (market closes Oct 7, 2026, consistent with data being reported with a ~1-week lag after month-end). [resolution_source] # Sub-question answers 1. **Current T110 price / sibling strike distribution** — YES=56% at T110 [kalshi_direct]. No real sibling-strike ladder data was retrievable; a code-tool exercise using an *illustrative* (not live) ladder implied mean ≈109.3, SD≈9.2, P(>110)≈47% — roughly consistent with the real 56% quote but should not be treated as independent confirmation. [code_execution, caveated] 2. **Recent index values / base period** — No actual numeric August, July, or September 2025 Carbon Arc index values were found in any source; the underlying series appears proprietary/paywalled. Reported qualitatively: post-August-2026 repricing, market probability mass concentrated in the "Above 102–104" range, implying August likely printed well below prior 105-106 expectations. [claude_news/Octagon] 3. **Aug→Sep seasonality & promo timing** — Prime Big Deal Days 2026 is confirmed for **October 6–7, 2026** (not September), so September lacks the major sale-driven spend spike; minor early-deal promos (car gift-card promo, early Kindle/device deals) began Sept 15 but are unlikely to match a full sale event. [claude_news, aboutamazon.com]. Illustrative modeling suggests a modest -1% to flat MoM seasonal drift Aug→Sep. [code_execution, illustrative] 4. **Amazon Q2/Q3 2026 guidance** — Not available; FMP earnings/quote/history calls all returned 403 errors. No structured Amazon revenue growth or guidance data obtained. [earnings_data — failed] 5. **FRED retail/e-commerce data** — Total retail sales (RSXFS) rose steadily through 2026 (Sept 2025: $632.4B → Aug 2026: $668.9B, ~+5.8% YoY). Nonstore retailers (RSNSR) up from $128.4B (Sep 2025) to $141.3B (Aug 2026), ~+10% YoY — a strong signal for online/card spend growth. E-commerce (ECOMSA) also rising (Q1 2026: $327.9B vs $317.99B Q4 2025). However consumer sentiment (UMCSENT) is soft/volatile: 55.1 (Sep 2025) → 44.8 (May 2026) → 55.2 (Jul 2026), reflecting tariff/affordability anxiety. [FRED] 6. **Prior KXAMZNCC market resolution behavior** — August 2026's "Above 105" contract collapsed from 64% to 8% following Amazon's Aug 1, 2026 advertiser billing system change that shifted much seller ad-fee payment off credit cards — a structural, likely persistent depressant on the index, not a one-off seasonal effect. [claude_news, Octagon AI] # Key facts (high-confidence, factual) 1. [kalshi_direct] T110 YES = 56%, up 2pp in 7 days, flat over 30 days. 2. [claude_news/Octagon] Amazon's new advertiser billing system (effective Aug 1, 2026) reduced credit-card usage for seller ad fees — a structural negative catalyst for the index. 3. [aboutamazon.com] Prime Big Deal Days 2026 confirmed Oct 6–7 — entirely outside September, removing the usual sale-driven boost from the September print. 4. [FRED] Nonstore retail sales (RSNSR) up ~10% YoY through Aug 2026; total retail sales (RSXFS) up ~5.8% YoY — supportive backdrop for online spend growth. 5. [FRED] Consumer sentiment (UMCSENT) volatile/soft in 2026 (44.8–56.6 range), below typical pre-2025 levels, signaling consumer caution. # Cross-market signals - **Kalshi related**: No true KXAMZNCC sibling markets returned (0 found); other Amazon-related Kalshi markets (FTC monopoly case) unrelated to spend. - **Polymarket**: Only Amazon 2026 capex threshold markets found (unrelated to card spend); all pricing near-certain YES (91–99%), no relevance to consumer spend index. - **Sportsbook implied**: N/A. # Analyst opinions and speculation - Octagon AI/claude_news synthesis argues September clearing 110 is "a stretch" absent a strong secular growth surprise, given (a) the ad-billing structural drag likely persists, (b) no September sale event, (c) prior repricing showed the index trending toward 102–104, well below 110. - The illustrative code-execution model (not live data) suggested a near coin-flip (~45-50%) but leaned NO on seasonal/YoY-growth cross-checks (110 implies ~10% YoY growth, "fairly strong" vs. typical single-digit growth). # Directional lean per outcome - **Yes (>110)**: Supported by strong FRED nonstore/e-commerce YoY growth (~10%), current Kalshi price above 50%, and minor early Big Deal Days pre-promotions bleeding into September. - **No (≤110)**: Supported by structural ad-billing headwind depressing card spend since August, absence of a major September sale event, August index reportedly trending toward 102-104 (well below 110), soft/volatile consumer sentiment, and illustrative seasonal modeling showing flat-to-negative Aug→Sep drift. # Gaps / unknowns - No actual numeric Carbon Arc index readings (any month) were retrievable — the entire quantitative base period/calibration is unknown. - Real August 2026 index value not confirmed (only qualitative "102-104 range" claim from one secondary source, Octagon AI). - Amazon Q2/Q3 2026 earnings guidance unavailable (data provider errors). - Sibling KXAMZNCC strikes' real prices unavailable — no verified market-implied distribution. # Calibration anchors - Kalshi current YES price: **56%** (primary anchor). - Precedent: August 2026 "Above 105" market cratered from 64% to 8% after a structural billing-system shock — shows this index/market can reprice sharply on structural (non-seasonal) news, and current 56% may not fully price in ongoing ad-billing drag persisting into September.

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

claude-fable-5-1

30% conf

Yes	51%
No	49%

Kalshi prices YES at 56% (T110), flat over 30 days and within a 51–60% range, so the market treats this as a near coin-flip. The brief adds mild NO-leaning context: Amazon's Aug 1, 2026 advertiser billing change structurally shifted seller ad fees off credit cards (crashing the August 'Above 105' contract from 64% to 8%), Prime Big Deal Days falls on Oct 6–7 rather than in September, and a secondary source claims August trended toward 102–104 — though that figure is unverified and, if true, would be hard to reconcile with the market still at 56%. Offsetting this, FRED nonstore retail sales are up ~10% YoY, supportive of card-spend growth. With no actual index readings available, I stay close to the Kalshi anchor and shade slightly toward NO for the persistent structural headwind.

claude-fable-5-1

33% conf

Yes	50%
No	50%

Kalshi prices YES at 56% (13-day range 51–60%), a near coin-flip, and participants trading after the ~Sept 7 August print presumably know the August level, which is the strongest available signal. The brief's bearish evidence — a structural Aug 1 ad-billing shift off credit cards that cratered the August 'Above 105' market, Prime Big Deal Days falling in October (no September sale spike), and an unverified secondary claim that August trended toward 102–104 — argues for shading below the market. Offsetting this, FRED nonstore retail sales are running ~10% YoY and the market has not drifted down despite the August shock being public. With no actual Carbon Arc index values available to calibrate, I stay close to the anchor but shade modestly toward NO.

claude-fable-5-1

33% conf

Yes	52%
No	48%

Kalshi prices YES at 56%, flat over 30 days and within a 51–60% range, indicating traders with access to the actual Carbon Arc series (which the brief could not retrieve) view this as a near coin-flip. The brief's bearish factors — the Aug 1 advertiser billing change that cratered the August 'Above 105' contract, Prime Big Deal Days falling in October rather than September, and a reported August print in the 102–104 range — are all public and already reflected in the post-August repricing, so they justify only a modest shade below the market rather than a large move. Supportive macro (nonstore retail ~+10% YoY) partially offsets soft consumer sentiment. With no actual index values, no sibling-strike ladder, and no Amazon guidance available, I stay close to the anchor with a slight NO tilt.

gpt-5.6-sol

53% conf

Yes	48%
No	52%

Kalshi’s 56% YES price is the primary anchor, but the evidence supports a modest move toward NO. The August advertiser-billing change appears to be a persistent drag on credit-card spend, while qualitative reports place the post-change index around 102–104, making a September print above 110 challenging. Prime Big Deal Days falls in October rather than September, and modeled August-to-September seasonality is flat to slightly negative, though roughly 10% year-over-year nonstore retail growth provides meaningful upside support. With no verified recent Carbon Arc readings or sibling-strike distribution, the bearish adjustment remains limited.

gpt-5.6-sol

52% conf

Yes	46%
No	54%

The Kalshi anchor is 56% YES, but the available fundamentals justify a modest move toward NO. The reported August repricing toward 102–104 and the persistent advertiser-billing change suggest September would need unusually strong month-over-month growth to exceed 110. Prime Big Deal Days falls in October, while flat-to-negative August-to-September seasonality and soft consumer sentiment further weigh against YES, although roughly 10% year-over-year nonstore retail growth provides meaningful upside support. Because no actual Carbon Arc readings or verified sibling-strike distribution are available, the bearish adjustment remains limited.

6. Final plain mean of 5 draws

49% (40% confidence)

Yes: 49% No: 51%

Mean of 5 draws (0.51, 0.50, 0.52, 0.48, 0.46). Kalshi prices YES at 56% (T110), flat over 30 days and within a 51–60% range, so the market treats this as a near coin-flip. The brief adds mild NO-leaning context: Amazon's Aug 1, 2026 advertiser billing change structurally shifted seller ad fees off credit cards (crashing the August 'Above 105' contract from 64% to 8%), Prime Big Deal Days falls on Oct 6–7 rather than in September, and a secondary source claims August trended toward 102–104 — though that figure is unverified and, if true, would be hard to reconcile with the market still at 56%. Offsetting this, FRED nonstore retail sales are up ~10% YoY, supportive of card-spend growth. With no actual index readings available, I stay close to the Kalshi anchor and shade slightly toward NO for the persistent structural headwind.

Pipeline Timing

Total pipeline time: 119.8s

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