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GET
/
v2
/
polymarket
/
markets
/
{condition_id}
/
open_interest
Get Market Open Interest Time Series
curl --request GET \
  --url https://api.predexon.com/v2/polymarket/markets/{condition_id}/open_interest \
  --header 'x-api-key: <api-key>'
{
  "condition_id": "<string>",
  "start_time": 123,
  "end_time": 123,
  "open_interest_over_time": [
    {
      "timestamp": 123,
      "open_interest_usd": 123
    }
  ],
  "market_id": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://docs.predexon.com/llms.txt

Use this file to discover all available pages before exploring further.

Fetch historical open interest for a market. Open interest represents total outstanding positions (can increase or decrease, unlike cumulative volume).
Free & Unlimited. This endpoint does not count toward your monthly usage limits on any plan.

Authorizations

​
x-api-key
string
header
required

Path Parameters

​
condition_id
string
required

Condition ID for the market

Query Parameters

​
granularity
enum<string>
default:day

Time granularity

Available options:
day,
week,
month,
year,
all
​
start_time
integer | null

Unix timestamp (seconds) for start

Required range: x >= 0
​
end_time
integer | null

Unix timestamp (seconds) for end

Required range: x >= 0

Response

Successful Response

Market open interest time series endpoint response.

​
condition_id
string
required
​
granularity
enum<string>
required

PnL granularity enum.

Available options:
day,
week,
month,
year,
all
​
start_time
integer
required
​
end_time
integer
required
​
open_interest_over_time
OpenInterestDataPoint · object[]
required
​
market_id
string | null

Market ID