{
  "_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."
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  "event_id": "CM-EVT-46WBCJDHS5",
  "slug": "massachusetts-democratic-senate-primary-winner",
  "question": "Will the Massachusetts Democratic Senate Primary winner be determined by September 1, 2026?",
  "category": "politics",
  "event_type": "BINARY",
  "ladder_distribution": null,
  "tags": [
    "politics",
    "elections",
    "massachusetts",
    "democratic-primary",
    "2026",
    "senate"
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  "catalyst_types": [],
  "catalyst_dates": [],
  "editorial_notes": "These markets track the outcome of the 2026 Massachusetts Democratic Senate primary. Each Polymarket contract prices one candidate's nomination probability as a binary outcome. Together, the contracts function as a mutually exclusive, collectively exhaustive probability distribution across the field. All contracts resolve via Polymarket's UMA Optimistic Oracle against the Massachusetts Democratic Party's first official primary announcement.",
  "venues_covered": [
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  "primary_market_id": "CM-MKT-KZH3KSQBT3",
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    "implied_probability": 0.3
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  "created_at": "2026-07-23T21:11:14.426158+00:00",
  "updated_at": "2026-07-23T21:11:14.426158+00:00",
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      "question": "Will Ayanna Pressley be the Democratic nominee for Senate in Massachusetts?",
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      "contract_type": "binary",
      "settlement_currency": "USDC",
      "underlying_reference": "Ayanna Pressley: The Massachusetts Democratic Party's first official announcement of the 2026 Democratic Senate Primary results, or overwhelming credible reporting consensus if no primary occurs, by September 1, 2026.",
      "close_at": "2026-09-01T00:00:00Z",
      "resolve_at": "2026-09-01T00:00:00Z",
      "status": "open",
      "resolution": {
        "rules_raw": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
        "arbitration_model": "uma_oracle",
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        "sources": [
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            "name": "Massachusetts Democratic party",
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            "provenance": "clearmarket_editorial"
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            "provenance": "clearmarket_editorial"
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      "question": "Will Ed Markey be the Democratic nominee for Senate in Massachusetts?",
      "description": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
      "contract_type": "binary",
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      "resolve_at": "2026-09-01T00:00:00Z",
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      "question": "Will Seth Moulton be the Democratic nominee for Senate in Massachusetts?",
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      "question": "Will Alexander Rikleen be the Democratic nominee for Senate in Massachusetts?",
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      "question": "Will Candidate A be the Democratic nominee for Senate in Massachusetts?",
      "description": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
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      "resolve_at": "2026-09-01T00:00:00Z",
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      "resolution": {
        "rules_raw": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
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      "question": "Will Candidate B be the Democratic nominee for Senate in Massachusetts?",
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        "rules_raw": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
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      "question": "Will Candidate C be the Democratic nominee for Senate in Massachusetts?",
      "description": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
      "contract_type": "binary",
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      "underlying_reference": "Candidate C: The Massachusetts Democratic Party's first official announcement of the 2026 Democratic Senate Primary results, or overwhelming credible reporting consensus if no primary occurs, by September 1, 2026.",
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      "resolve_at": "2026-09-01T00:00:00Z",
      "status": "closed",
      "resolution": {
        "rules_raw": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
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      "question": "Will Candidate D be the Democratic nominee for Senate in Massachusetts?",
      "description": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
      "contract_type": "binary",
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        "rules_raw": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
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      "event_id": "CM-EVT-46WBCJDHS5",
      "platform": "polymarket",
      "platform_market_id": "0xb5331ff074c6da3b5860fac13ff04ae36457816ad9bb8054cc9d843d2bc67da1",
      "question": "Will Candidate E be the Democratic nominee for Senate in Massachusetts?",
      "description": "This market will resolve according to the winner of the Democratic Primary for United States Senator from Massachusetts.\n\nIf no 2026 Massachusetts Democratic Senate Primary takes place, this market will resolve to \"Other\".\n\nThe resolution source for this market will be the first announcement of the results from the Massachusetts Democratic party, however an overwhelming consensus of credible reporting may suffice.",
      "contract_type": "binary",
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