Bitcoin price thresholds

What exactly resolves?

Polymarket uses Binance candle highs and excludes other exchanges. Kalshi supplies its own reference-price rule and contract definition. Inspect the full source conditions in the raw snapshot and official contract before interpreting a comparison.

The Polymarket month ends September 30 at 11:59 p.m. ET; the selected Kalshi observation is September 25 at 5 p.m. ET. Neither is interchangeable with a daily closing price.

Are the two platforms asking the same question?

Polymarket asks whether a Binance BTC/USDT one-minute candle HIGH reaches $90,000 during September. Kalshi’s selected contract tests its specified Bitcoin reference price at a particular Friday observation. Threshold, observation window, and price source differ. A price can touch a threshold and later fall below it.

Is there room at the quoted price?

Depth below is measured from the captured book within 2¢ of each side’s best ask. The 100- and 1,000-share examples consume successive ask levels. These are snapshots of visible entry liquidity, not reservations, total market capacity, or exit guarantees. Kalshi asks are derived as 1 minus the opposing bid with its available quantity.

Reported 24h activity: Polymarket parent event 1,621,642 USD; selected contract 177,235 USD. Kalshi parent event 763,636 contracts; selected contract 25,612 contracts. These units are not interchangeable.

Both sides: upside is not the same as likelihood

One hypothetical share at each captured ask, before fees. The price is not a measured win probability. A winning share pays one unit; a losing share pays zero. Football ties and exceptional settlement can pay other amounts.

Return if win is conditional net gain ÷ entry cost. It is not expected return, annualized return, or a recommendation. Fees lower the gain and increase the amount at risk.

Evidence and forecasting thesis

The captured contract midpoint is the initial market benchmark. EODHD daily data is context only; no calibrated barrier-hitting probability was fitted. The ±5-point scenarios are deliberately hypothetical.

• Distance to each threshold and time remaining; hitting a barrier differs from finishing above it.
• Volatility and jumps: a symmetric day-to-day model can understate rare large moves.
• Venue basis, time zones, and exact sampling windows. A broad crypto headline does not establish a qualifying candle.

What would invalidate the assessment: A qualifying historical candle may settle the touch question immediately. Verify that it has not already occurred before applying any forward-looking probability model.

Risk profile: A high-priced NO outcome can offer little remaining upside while a sudden rally can lose most or all of the entry cost. Frequent price changes can invalidate both a quote and its depth quickly.

Probability model and payoff sensitivity

The starting benchmark is the captured Polymarket bid–ask midpoint, 49.85%. No validated independent model justifies changing it. Lower and higher scenarios move this assumption by five percentage points; they are not confidence bounds or recommendations. Figures use 100 shares at the best ask plus an illustrative 1¢ per share total fee allowance. Larger entries require the depth simulation.

Formula: expected net = N × [p(win) + 0.5 × p(tie) − entry − fee]. The binary table assumes p(tie)=0. Break-even under that assumption is 50.90%. A better-looking result after increasing p proves only that the calculation responds to p.

Every tool’s contribution

Observed inputs, calculated outputs, actual provider responses, and tools that cannot support this study are identified separately. All sixteen learning tools are accounted for.

Actual provider outputs: inspect before trusting

Jev returned different for the rule comparison, with classification confidence 96.00% using jev-1.13.0. This is not the event’s probability. The request rubric and full distribution are in the evidence download.

Drift forecast window: 2026-09-21T23:41:41.640764Z to 2026-10-01T04:41:41.640764Z. Quality flag: low_data. Rejected for probability modeling. Near-zero variation in a projected band is not proof of low risk.

BTC-USD.CC daily closes and dated articles are contextual inputs. They cannot establish Binance BTC/USDT intraminute highs or Kalshi’s specified observation.

EODHD returned 31 daily records for BTC-USD.CC. Latest record: 2026-09-21, close 81,369.3281 in quoted instrument units. Retrieval: 2026-09-21T22:41:26.885Z. Same-day values may not be final. No election, policy, or touch-threshold probability was derived from them.

• XRP and NEAR Lead Altcoin Squeeze as Crypto Short Sellers Lose $666 Million in 24 Hours

  2026-09-21T15:34:00.000Z · unrelated · classification confidence 51.00%

• Bitcoin Price Briefly Rockets to $155,000 in Bitfinex Market Glitch

  2026-09-21T11:08:00.000Z · insufficient · classification confidence 33.00%

• Bitcoin Reclaims Key Weekly Level for First Time in 45 Weeks

  2026-09-21T05:29:00.000Z · insufficient · classification confidence 41.00%

• $930,040,000 in Bitcoin and Crypto Liquidated As BTC Price Crosses $86,000

  2026-09-21T00:00:00.000Z · insufficient · classification confidence 73.00%

• Michael Saylor’s Strategy Restarts Bitcoin Purchases, Adding $76,000,000 Worth of BTC

  2026-09-21T00:00:00.000Z · unrelated · classification confidence 54.00%

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      "topic": "Will Bitcoin reach $90,000 in September?",
      "keywords": [
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          "term": "Bitcoin price",
          "score": 95,
          "trend": "rising"
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        {
          "term": "ETF inflows",
          "score": 80,
          "trend": "rising"
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        {
          "term": "short squeeze",
          "score": 75,
          "trend": "rising"
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        {
          "term": "technical analysis",
          "score": 68,
          "trend": "stable"
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        {
          "term": "spot demand",
          "score": 60,
          "trend": "rising"
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        {
          "term": "Federal Reserve",
          "score": 45,
          "trend": "stable"
        },
        {
          "term": "Clarity Act",
          "score": 35,
          "trend": "declining"
        },
        {
          "term": "USDT dominance",
          "score": 25,
          "trend": "stable"
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      "coverageTrend": "accelerating",
      "coverageChangePct": 45,
      "sentimentScore": 70,
      "sentimentTrend": "improving",
      "signalScore": 85,
      "signalDirection": "bullish",
      "interpretation": "Recent news indicates a strong bullish sentiment for Bitcoin, with several analysts targeting $90,000 in September. The price has broken above key resistance levels, driven by renewed spot demand, significant ETF inflows, and a short squeeze. While some caution remains regarding potential pullbacks, the overall market structure suggests a continued upward trend.",
      "leadingIndicators": [
        "Sustained spot and ETF demand for Bitcoin",
        "Bitcoin holding above $85,000 and clearing $87,000 resistance",
        "Positive Coinbase premium and firmer USDT pricing"
      ],
      "watchNext": [
        "ETF flows and U.S. Treasury yields",
        "Federal Reserve official speeches (September 22 and 24)",
        "Bitcoin maintaining support above $83,700 and breaking $87,000"
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      "dataWindow": "7 days"
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Costs, participation mechanics, and limits

• Entering: choosing a side, size, and price is different from receiving a fill. A limit can remain unfilled; crossing available quotes can consume multiple levels. These pages place no orders.
• Exiting: today’s entry depth says nothing certain about future bids. Early exit introduces a future-price assumption and may add fees. A marked gain is not a realized payout.
• Fees: all five captured Polymarket markets report fees enabled; the legacy fee endpoint returns base_fee 1000. This study does not interpret that as a flat 10% charge. Use the current market-specific schedule and rounding. Kalshi’s series fee type is quadratic; overrides and execution type can matter.
• Time and settlement: distinguish the event time, order close, resolution, dispute period, and withdrawal availability. Holding time and currency/funding costs are excluded from the scenario.
• Eligibility and access: platform and regional rules apply. Educational access to these pages does not establish eligibility to transact on either venue.
• Concentration: related topics may move together. The five studies are a learning set, not a diversified portfolio or an allocation proposal.

Polymarket fee documentation · Kalshi fee schedule