Review open-interest history for one Kalshi market. Returns timestamped open-interest observations for a specified Kalshi market. Use one Toolmu account and a shared prepaid balance across available Tools. Pay per use; no separate supplier subscription is required. The current execution ceiling for this Tool is 0.0288 Toolmu credits per call. This is a maximum, not the settled charge. Before execution, get the current Tool contract and check availability, the latest maximumCredits, your balance and budget. Supplier response credits_used, when present, describes supplier API credits and is not the Toolmu customer charge.
Up to 0.0288 credits / call
The final charge is based on confirmed usage. Unused reserved credits return to your available balance.
Surf
Kalshi Open Interest History by Ticker | Surf
Review open-interest history for one Kalshi market. Returns timestamped open-interest observations for a specified Kalshi market. Use one Toolmu account and a shared prepaid balance across available Tools. Pay per use; no separate supplier subscription is required. The current execution ceiling for this Tool is 0.0288 Toolmu credits per call. This is a maximum, not the settled charge. Before execution, get the current Tool contract and check availability, the latest maximumCredits, your balance and budget. Supplier response credits_used, when present, describes supplier API credits and is not the Toolmu customer charge.
You receive
Returns timestamped open-interest observations for a specified Kalshi market. Kalshi open interest is a contract-count measure. It does not directly equal Polymarket USD open interest or a count of unique holders.
Start with your task
Show the number of Kalshi contracts still open for [a market link or full question] over [30 days]. Find the matching market from the link or question; if several match, ask me to choose. Explain the dated changes simply; this counts contracts, not people or dollars.
Inputs & outputs
Inspect the current inputs, availability, and maximum charge before starting.
Input schema
Input schema
Field / Path
Type
Requirement
Meaning
queryParamsqueryParams
object
Required
Required fields
ticker
tickerqueryParams.ticker
string
Required
Market ticker identifier. Use GET /v1/prediction-market/kalshi/markets or GET /v1/search/prediction-market?platform=kalshi&q={keyword} to discover valid tickers. Example: KXBTC2026250-27JAN01-250000.
Minimum length
1
time_rangequeryParams.time_range
string
Optional
Window of history to return: 7d, 30d, 90d, 180d, or 1y. This endpoint uses time_range only — it does NOT accept interval. Example: 30d. Defaults to "30d".
Default
30d
Options
7d, 30d, 90d, 180d, 1y
View raw JSON
{
"type": "object",
"required": [
"queryParams"
],
"properties": {
"queryParams": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"ticker"
],
"~standard": {
"vendor": "zod",
"version": 1,
"jsonSchema": {}
},
"properties": {
"ticker": {
"type": "string",
"minLength": 1,
"description": "Market ticker identifier. Use GET /v1/prediction-market/kalshi/markets or GET /v1/search/prediction-market?platform=kalshi&q={keyword} to discover valid tickers. Example: KXBTC2026250-27JAN01-250000."
},
"time_range": {
"enum": [
"7d",
"30d",
"90d",
"180d",
"1y"
],
"type": "string",
"default": "30d",
"description": "Window of history to return: 7d, 30d, 90d, 180d, or 1y. This endpoint uses time_range only — it does NOT accept interval. Example: 30d. Defaults to \"30d\"."
}
},
"additionalProperties": false
}
},
"additionalProperties": false
}
Result schema
Output fields have not been documented yet.
Additional notes
Review open-interest history for one Kalshi market
How to use this Tool
Use the deployed input fields below. Required fields must be supplied; optional filters narrow the result.
queryParams.ticker (Required): Market ticker identifier. Use GET /v1/prediction-market/kalshi/markets or GET /v1/search/prediction-market?platform=kalshi&q={keyword} to discover valid tickers. Example: KXBTC2026250-27JAN01-250000.
queryParams.time_range (Optional): Window of history to return: 7d, 30d, 90d, 180d, or 1y. This endpoint uses time_range only — it does NOT accept interval. Example: 30d. Defaults to "30d".
What this Tool returns
Returns timestamped open-interest observations for a specified Kalshi market.
Response fields and how to read them
The table follows the official response contract, including nested fields and useful response metadata. [] denotes an array item. Required means required within its parent object, not that a conditional parent always exists. A nullable type permits null; an optional field can be absent. Use the documented conditions below to distinguish missing, empty and zero values. Units and reporting windows apply only where explicitly documented.
Field, type and presence
Meaning and conditions
data.[].open_interest
number; Required within parent; format: double
Open interest on this date (contracts)
data.[].timestamp
integer; Required within parent; format: int64
Unix timestamp in seconds (midnight UTC for the trading day)
meta.cached
boolean; Required within parent
Whether this response was served from cache
meta.credits_used
integer; Required within parent; format: int64
Credits deducted for this request
meta.empty_reason
string; Optional within parent
Hint explaining why the data array is empty, when applicable
meta.has_more
boolean; Optional within parent
Whether more items may exist beyond this response. For offset-paged endpoints, continue with a larger offset. For time-series endpoints without offset/cursor controls, true means the requested time range hit an upstream cap; narrow from/to to continue. Omitted when exhaustion cannot be proven.
meta.limit
integer; Required within parent; format: int64
Maximum number of items returned in this response
meta.offset
integer; Required within parent; format: int64
Number of items skipped (pagination offset)
meta.total
integer; Optional within parent; format: int64
Total number of matching items (before pagination). Omitted when total is unknown.
meta.watermark
integer; Optional within parent; format: int64
Warehouse watermark (Unix seconds) this response was computed at, on warehouse-backed endpoints (e.g. Hyperliquid /trades/aggregate) — rows up to this time come from the warehouse, newer rows from the live tail. Omitted elsewhere.
Coverage, units and freshness
Kalshi open interest is a contract-count measure. It does not directly equal Polymarket USD open interest or a count of unique holders.
Inspect any returned observation time, cache status, watermark, pagination and errors using their documented meanings. A successful request alone does not establish complete coverage. Where no freshness or completeness guarantee is documented, treat it as unknown. Saved Examples are historical and viewing them does not refresh data or execute a new call.
Data source and references
Surf supplies this endpoint through its Data API. Response contract and deployed Tool inputs reviewed on 2026-10-03 against official OpenAPI v0.2.102. This is a contract review date, not a data observation time. Coverage depends on the selected endpoint and request.
Use one Toolmu account and a shared prepaid balance across available Tools. Pay per use; no separate supplier subscription is required. The current execution ceiling for this Tool is 0.0288 Toolmu credits per call. This is a maximum, not the settled charge. Before execution, get the current Tool contract and check availability, the latest maximumCredits, your balance and budget. Supplier response credits_used, when present, describes supplier API credits and is not the Toolmu customer charge.
Example request: Show how the number of contracts still open changed for [a Kalshi market share link] over [the past 30 days], using the dates shown by the source.
Example request: Find the Kalshi market matching [Will the Fed cut interest rates in December?] and show how its contract count changed over [90 days]. If several match, ask me to choose.
Show the number of Kalshi contracts still open for [a market link or full question] over [30 days]. Find the matching market from the link or question; if several match, ask me to choose. Explain the dated changes simply; this counts contracts, not people or dollars.
See recent changes
Example request: Show how many contracts remain for [a Kalshi market link] over [the past 7 days], and explain the change in plain language.
Questions about this tool.
Inputs, results and details to know before running it.
queryParams.ticker (Required): Market ticker identifier. Use GET /v1/prediction-market/kalshi/markets or GET /v1/search/prediction-market?platform=kalshi&q={keyword} to discover valid tickers. Example: KXBTC2026250-27JAN01-250000. queryParams.time_range (Optional): Window of history to return: 7d, 30d, 90d, 180d, or 1y. This endpoint uses time_range only — it does NOT accept interval. Example: 30d. Defaults to "30d".
Returns timestamped open-interest observations for a specified Kalshi market.
Kalshi open interest is a contract-count measure. It does not directly equal Polymarket USD open interest or a count of unique holders.
Use one Toolmu account and a shared prepaid balance across available Tools. Pay per use; no separate supplier subscription is required. The current execution ceiling for this Tool is 0.0288 Toolmu credits per call. This is a maximum, not the settled charge. Before execution, get the current Tool contract and check availability, the latest maximumCredits, your balance and budget. Supplier response credits_used, when present, describes supplier API credits and is not the Toolmu customer charge.
Ask your agent to Review open-interest history for one Kalshi market. Provide the required inputs above. If Toolmu is already connected, reuse that connection; otherwise use the setup instructions on this page. Before a paid execution, the agent must read the current Tool contract and check availability, the credit ceiling, balance, budget and your authorization. It should then execute the Tool and explain the returned fields and limitations.
Inspect any returned observation time, cache status, watermark, pagination and errors using their documented meanings. A successful request alone does not establish complete coverage. Where no freshness or completeness guarantee is documented, treat it as unknown. Saved Examples are historical and viewing them does not refresh data or execute a new call.
