{
  "_notice": {
    "type": "free_key_offer",
    "message": "Free and anonymous access is staying. If this endpoint is in your pipeline, a free key adds advance notice before any schema change or deprecation. POST /v1/keys {\"email\": \"you@firm.com\"} — nothing else required. Something broken or missing? hello@clearmarket.fyi reaches a human.",
    "docs": "https://clearmarket.fyi/for-data/",
    "policy": "This field is additive and its shape will not change."
  },
  "event_id": "CM-EVT-D0T3BF05P9",
  "slug": "massachusetts-senate-election-winner",
  "question": "Will a Republican win the Massachusetts Senate seat in the next election?",
  "category": "politics",
  "event_type": "BINARY",
  "ladder_distribution": null,
  "tags": [
    "politics",
    "elections",
    "massachusetts",
    "us-senate",
    "2026-election",
    "partisan-outcome"
  ],
  "catalyst_types": [],
  "catalyst_dates": [],
  "editorial_notes": "These markets track the outcome of the 2026 Massachusetts U.S. Senate election. Polymarket structures the event as parallel binary contracts: one per candidate, plus party-level and field outcomes. All contracts resolve via Polymarket's UMA Optimistic Oracle, keyed to an Associated Press race call. Implied probabilities across individual contracts must sum to one, creating an internal consistency check for relative pricing.",
  "venues_covered": [
    "polymarket"
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  "primary_market_id": "CM-MKT-Y0WNFMTVY8",
  "current_primary_mark": {
    "last_price": 0.94,
    "implied_probability": 0.94
  },
  "created_at": "2026-06-03T14:52:43.794845+00:00",
  "updated_at": "2026-06-03T14:52:43.794845+00:00",
  "markets": [
    {
      "market_id": "CM-MKT-Y0WNFMTVY8",
      "event_id": "CM-EVT-D0T3BF05P9",
      "platform": "polymarket",
      "platform_market_id": "0x6f56cdf896a8cdb2552661dd7b3d54dab6ef418d5be0d8a96dea3f16cbf31632",
      "question": "Will the Democrats win the Massachusetts Senate race in 2026?",
      "description": "This market will resolve according to the winner of the 2026 midterm Massachusetts U.S. Senate election, inclusive of any run-offs.\n\nA candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.\n\nCandidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.\n\nThe resolution source for this market is the Associa",
      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "The Associated Press calls the 2026 Massachusetts U.S. Senate election winner.",
      "close_at": null,
      "resolve_at": null,
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the winner of the 2026 midterm Massachusetts U.S. Senate election, inclusive of any run-offs.\n\nA candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.\n\nCandidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.\n\nThe resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.",
        "arbitration_model": "uma_oracle",
        "proposer": "managed_whitelist",
        "source": "Associated Press",
        "source_status": "platform_named",
        "source_citation": null,
        "sources": null,
        "source_of_record": null,
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        "source_quality": null,
        "source_commitment": "named",
        "source_commitment_subtype": "named",
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      "rcg": {
        "grade": "A",
        "score": 82,
        "caps": [],
        "applied_factors": 7
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      "last_price": 0.94,
      "implied_probability": 0.94,
      "volume_24h_usd": 0,
      "volume_total_usd": 8684.911347999996,
      "settlement_style": "occurrence",
      "direction": "occurrence",
      "threshold": null,
      "question_id": null,
      "also_on": null,
      "tags": [
        "democratic party",
        "ma-senate-2026",
        "party"
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      "eligibility_screens": null
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    {
      "market_id": "CM-MKT-XDJD39NSX2",
      "event_id": "CM-EVT-D0T3BF05P9",
      "platform": "polymarket",
      "platform_market_id": "0xc07048f298bae3ec73447a92cdc2dfd2e44d10ae1164b6d50db68ec5ab4b2766",
      "question": "Will the Republicans win the Massachusetts Senate race in 2026?",
      "description": "This market will resolve according to the winner of the 2026 midterm Massachusetts U.S. Senate election, inclusive of any run-offs.\n\nA candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.\n\nCandidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.\n\nThe resolution source for this market is the Associa",
      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "The Associated Press calls the 2026 Massachusetts U.S. Senate election winner.",
      "close_at": null,
      "resolve_at": null,
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the winner of the 2026 midterm Massachusetts U.S. Senate election, inclusive of any run-offs.\n\nA candidate shall be considered to represent a party in the event that he or she is the nominee of the party in question. Candidates other than the Democratic or Republican nominee (e.g., Greens, Libertarian, independent) may be added at a later date.\n\nCandidates who run as independents will not be encompassed by the “Democrat” or “Republican” options regardless of any affiliation they may have with the party.\n\nThe resolution source for this market is the Associated Press, Fox News, and NBC. This market will resolve once all three sources call the race for the same candidate. If all three sources haven’t called the race in this state for the same candidate, this market will resolve based on the official certification.",
        "arbitration_model": "uma_oracle",
        "proposer": "managed_whitelist",
        "source": "Associated Press",
        "source_status": "platform_named",
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        "sources": null,
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        "source_commitment": "named",
        "source_commitment_subtype": "named",
        "source_hedge_text": null
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      "rcg": {
        "grade": "A",
        "score": 82,
        "caps": [],
        "applied_factors": 7
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      "last_price": 0.031,
      "implied_probability": 0.031,
      "volume_24h_usd": 0,
      "volume_total_usd": 4665.227977,
      "settlement_style": "occurrence",
      "direction": "occurrence",
      "threshold": null,
      "question_id": null,
      "also_on": null,
      "tags": [
        "ma-senate-2026",
        "party",
        "republican party"
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      "eligibility_screens": null
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  "resolution_log": [],
  "_provenance": {
    "source": "clearmarket.fyi",
    "ref": "CM-EVT-D0T3BF05P9",
    "terms": "Attribution required. clearmarket.fyi"
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}