Orderbook

Live orderbook data normalized by Prediction.com across supported platforms. Returns the full bid/ask ladder for a given market. Kalshi, Polymarket, Polymarket US, Opinion, and Predict.fun are supported. On Polymarket US and Predict.fun only the long (YES) side is quoted - the short side is priced as its complement, so no levels come back empty. Returns 404 when no orderbook data is available for the market.

GET/v2/orderbook

Plans All plansPlan rate limits apply

Parameters

platformstringrequired

market_idstringrequired

Platform-native market ID (required).

Response

market_idstring

Platform-native market ID.

platformstring

Platform name.

timestampstring

Timestamp of the orderbook snapshot (ISO 8601).

yesobject

YES outcome orderbook.

Show 2 fields

bidsobject[]

Bid levels.

Show 2 fields

pricenumber

Price level in cents (0-100) - the canonical unit across all v2 price endpoints.

sizenumber

Size/quantity at this level.

asksobject[]

Ask levels.

Show 2 fields

pricenumber

Price level in cents (0-100) - the canonical unit across all v2 price endpoints.

sizenumber

Size/quantity at this level.

noobject

NO outcome orderbook.

Show 2 fields

bidsobject[]

Bid levels.

Show 2 fields

pricenumber

Price level in cents (0-100) - the canonical unit across all v2 price endpoints.

sizenumber

Size/quantity at this level.

asksobject[]

Ask levels.

Show 2 fields

pricenumber

Price level in cents (0-100) - the canonical unit across all v2 price endpoints.

sizenumber

Size/quantity at this level.

Try it

Sample data

Platform*

Market ID*

Sample mode returns a fixed recorded example; input changes apply to live requests. Switch it off to query live data with these parameters.

{
  "market_id": "KXPRESPERSON-28-GNEWS",
  "no": {
    "asks": [],
    "bids": [
      {
        "price": 0.1,
        "size": 5010000
      },
      {
        "price": 1,
        "size": 6390810
      },
      {
        "price": 2,
        "size": 1890559
      },
      {
        "price": 3,
        "size": 1737
      },
      {
        "price": 4,
        "size": 1590000
      },
      {
        "price": 4.1,
        "size": 100000
      },
      {
        "price": 5,
        "size": 25
      },
      {
        "price": 7,
        "size": 1290000
      },
      {
        "price": 11,
        "size": 990000
      },
      {
        "price": 13,
        "size": 400
      },
      {
        "price": 16,
        "size": 690000
      },
      {
        "price": 21,
        "size": 499000
      },
      {
        "price": 23,
        "size": 226
      },
      {
        "price": 26,
        "size": 299000
      },
      {
        "price": 29,
        "size": 10000
      },
      {
        "price": 31,
        "size": 189002
      },
      {
        "price": 33,
        "size": 157
      },
      {
        "price": 36,
        "size": 89000
      },
      {
        "price": 37,
        "size": 50000
      },
      {
        "price": 40,
        "size": 50
      },
      {
        "price": 43,
        "size": 39121
      },
      {
        "price": 44,
        "size": 118
      },
      {
        "price": 45,
        "size": 140
      },
      {
        "price": 45.1,
        "size": 1029
      },
      {
        "price": 46,
        "size": 113
      },
      {
        "price": 47,
        "size": 860
      },
      {
        "price": 48,
        "size": 358
      },
      {
        "price": 49,
        "size": 106
      },
      {
        "price": 50,
        "size": 172
      },
      {
        "price": 51,
        "size": 19102
      },
      {
        "price": 52,
        "size": 100
      },
      {
        "price": 53,
        "size": 98
      },
      {
        "price": 54,
        "size": 96
      },
      {
        "price": 55,
        "size": 114
      },
      {
        "price": 55.1,
        "size": 5000
      },
      {
        "price": 56,
        "size": 492
      },
      {
        "price": 57,
        "size": 91
      },
      {
        "price": 58,
        "size": 89
      },
      {
        "price": 59,
        "size": 88
      },
      {
        "price": 60,
        "size": 54198
      },
      {
        "price": 60.1,
        "size": 5000
      },
      {
        "price": 61,
        "size": 135
      },
      {
        "price": 62,
        "size": 84
      },
      {
        "price": 63,
        "size": 82
      },
      {
        "price": 64,
        "size": 112
      },
      {
        "price": 65,
        "size": 606
      },
      {
        "price": 65.1,
        "size": 5000
      },
      {
        "price": 66,
        "size": 78
      },
      {
        "price": 67,
        "size": 3077
      },
      {
        "price": 68,
        "size": 121
      },
      {
        "price": 69,
        "size": 10075
      },
      {
        "price": 70,
        "size": 10909
      },
      {
        "price": 70.1,
        "size": 5000
      },
      {
        "price": 71,
        "size": 493
      },
      {
        "price": 72,
        "size": 592
      },
      {
        "price": 73,
        "size": 271
      },
      {
        "price": 74,
        "size": 71
      },
      {
        "price": 75,
        "size": 5021
      },
      {
        "price": 76,
        "size": 5594
      },
      {
        "price": 77,
        "size": 11083
      },
      {
        "price": 77.9,
        "size": 10000
      },
      {
        "price": 78,
        "size": 31038
      },
      {
        "price": 78.1,
        "size": 3333
      },
      {
        "price": 78.5,
        "size": 200
      },
      {
        "price": 78.9,
        "size": 382
      },
      {
        "price": 79,
        "size": 41607
      },
      {
        "price": 79.1,
        "size": 3333
      },
      {
        "price": 79.9,
        "size": 39
      },
      {
        "price": 80,
        "size": 6790
      },
      {
        "price": 80.1,
        "size": 2222
      },
      {
        "price": 80.4,
        "size": 70
      },
      {
        "price": 81,
        "size": 20112
      },
      {
        "price": 81.4,
        "size": 24
      },
      {
        "price": 81.6,
        "size": 324
      },
      {
        "price": 81.8,
        "size": 14458
      }
    ]
  },
  "platform": "kalshi",
  "timestamp": "2026-04-03T18:09:13.709541+00:00",
  "yes": {
    "asks": [],
    "bids": [
      {
        "price": 0.1,
        "size": 11020000
      },
      {
        "price": 1,
        "size": 181610
      },
      {
        "price": 1.1,
        "size": 80000
      },
      {
        "price": 1.2,
        "size": 1672
      },
      {
        "price": 2,
        "size": 11049
      },
      {
        "price": 3,
        "size": 6666
      },
      {
        "price": 4,
        "size": 1
      },
      {
        "price": 5,
        "size": 4222
      },
      {
        "price": 6,
        "size": 2000
      },
      {
        "price": 8,
        "size": 1497
      },
      {
        "price": 9,
        "size": 2248
      },
      {
        "price": 10,
        "size": 93
      },
      {
        "price": 11,
        "size": 12
      },
      {
        "price": 12,
        "size": 2149
      },
      {
        "price": 13,
        "size": 227
      },
      {
        "price": 14,
        "size": 29
      },
      {
        "price": 14.6,
        "size": 250
      },
      {
        "price": 15,
        "size": 8085
      },
      {
        "price": 15.1,
        "size": 10000
      },
      {
        "price": 16,
        "size": 6646
      },
      {
        "price": 16.1,
        "size": 5000
      },
      {
        "price": 16.2,
        "size": 52
      },
      {
        "price": 17,
        "size": 4514
      },
      {
        "price": 17.1,
        "size": 15001
      },
      {
        "price": 17.2,
        "size": 3058
      },
      {
        "price": 17.6,
        "size": 251
      },
      {
        "price": 18,
        "size": 3414
      },
      {
        "price": 18.1,
        "size": 1456
      }
    ]
  }
}