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Prediction Market data is currently in beta. It is actively being worked on and improved, but may be unreliable. Polymarket and Kalshi data are live.
This endpoint requires a Growth or Enterprise plan. Learn more.

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Returns

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OnPredictionEventBarsUpdatedResponse
OnPredictionEventBarsUpdatedResponse
See OnPredictionEventBarsUpdatedResponse

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Arguments

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eventId
String!
required
The ID of the prediction event.

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Subscription example

subscription {
  onPredictionEventBarsUpdated(eventId: "67284:Polymarket:0xc5d563a36ae78145c45a50134d48a1215220f80a:137") {
    bars {
      min1 {
        t
        volumeUsd
        buyVolumeUsd
        sellVolumeUsd
        totalVolumeUsd
        venueVolumeUsd
        volumeCollateralToken
        trades
        uniqueTraders
        lastEventTimestamp
        liquidityUsd {
          o
          h
          l
          c
        }
        openInterestUsd {
          o
          h
          l
          c
        }
      }
      min5 {
        t
        volumeUsd
        trades
        uniqueTraders
        liquidityUsd {
          o
          h
          l
          c
        }
      }
      min15 {
        t
        volumeUsd
        trades
      }
      hour1 {
        t
        volumeUsd
        totalVolumeUsd
        trades
      }
      hour4 {
        t
        volumeUsd
      }
      day1 {
        t
        volumeUsd
        totalVolumeUsd
      }
    }
  }
}
Example Response
{
  "data": {
    "onPredictionEventBarsUpdated": {
      "bars": {
        "min1": {
          "t": 1773357360,
          "volumeUsd": "1047.043738",
          "buyVolumeUsd": "1046.940304",
          "sellVolumeUsd": "0.103434",
          "totalVolumeUsd": "183698948.904681",
          "venueVolumeUsd": "350603420.708316",
          "volumeCollateralToken": "1047.10344",
          "trades": 5,
          "uniqueTraders": 2,
          "lastEventTimestamp": 1773357373,
          "liquidityUsd": {
            "o": "40568747.579197",
            "h": "40569107.283499",
            "l": "40568639.455529",
            "c": "40568771.326025"
          },
          "openInterestUsd": {
            "o": "34058066.149446",
            "h": "34058066.149446",
            "l": "34058066.149446",
            "c": "34058066.149446"
          }
        },
        "min5": {
          "t": 1773357300,
          "volumeUsd": "3347.885241",
          "trades": 10,
          "uniqueTraders": 3,
          "liquidityUsd": {
            "o": "40571553.036979",
            "h": "40571553.036979",
            "l": "40568639.455529",
            "c": "40568771.326025"
          }
        },
        "min15": {
          "t": 1773357300,
          "volumeUsd": "3347.885241",
          "trades": 10
        },
        "hour1": {
          "t": 1773356400,
          "volumeUsd": "29290.703467",
          "totalVolumeUsd": "183698948.904681",
          "trades": 72
        },
        "hour4": {
          "t": 1773345600,
          "volumeUsd": "129468.523663"
        },
        "day1": {
          "t": 1773273600,
          "volumeUsd": "8580175.57018",
          "totalVolumeUsd": "183698948.904681"
        }
      }
    }
  }
}

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Usage Guidelines

  • Event ID format varies by platform:
    • Polymarket: <eventSlug>:Polymarket:<exchangeAddress>:<networkId> (e.g., 67284:Polymarket:0xc5d563a36ae78145c45a50134d48a1215220f80a:137)
    • Kalshi: <eventSlug>:Kalshi (e.g., KXMVESPORTSMULTIGAMEEXTENDED-S2026350C4EF9BCE:Kalshi)
  • Subscribe using eventId to receive live bar chart data for a prediction event
  • Bars are provided across multiple resolutions simultaneously: min1, min5, min15, min30, hour1, hour4, hour12, day1, and week1
  • Updates stream whenever new trading activity occurs, recalculating affected bars

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Troubleshooting Tips

Choose based on your timeframe: min1 for tick-by-tick updates, min5 or min15 for short-term charts (1-hour view), hour1 or hour4 for medium-term (1-day to 1-week view), and day1 or week1 for long-term historical views. Request only the resolutions you need to reduce data volume.
The t field is the Unix timestamp marking the start of that bar’s time period. For example, a 5-minute bar with t: 1710345600 covers the period from that timestamp to 5 minutes later (1710345900). Bars are aligned to clean intervals (e.g., :00, :05, :10 for 5-minute bars).
OHLC (Open, High, Low, Close) shows the range and direction of liquidity or open interest during that bar. o is the value at the bar’s start, h is the maximum, l is the minimum, and c is the value at the bar’s end. This helps visualize how capital flow changed over time.
volumeUsd is the trading volume that occurred during that specific bar period, while totalVolumeUsd is the cumulative all-time volume for the event up to that bar. Use volumeUsd for bar charts and totalVolumeUsd to show total market size.
Bars update in real-time as trades occur. When a new trade happens, all affected bars (across all resolutions) are recalculated and pushed via the subscription. High-activity events may send updates multiple times per second during peak trading.
No. Bars only exist if there was activity during that time period. For events with sparse trading, you may receive null values for smaller resolutions (e.g., min1 or min5) while larger resolutions (e.g., hour1, day1) have data. Check for null before rendering.
Bars are considered “complete” once their time period has passed. For example, a 1-minute bar starting at 12:00:00 is complete after 12:01:00. You can update your chart in real-time for the current incomplete bar and treat completed bars as final. Use lastEventTimestamp to determine freshness.