Kalshi historical API
The historical API from Kalshi — 7 operation(s) for historical.
Kalshi historical API is one of 21 APIs that Kalshi publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include historical. The published artifact set on APIs.io includes an OpenAPI specification and API documentation.
This API exposes 7 operations across 7 paths, and defines 23 schemas. It is described by OpenAPI 3.0.0, at version 3.19.0.
Requests are made against 4 base URLs: https://external-api.kalshi.com/trade-api/v2, https://api.elections.kalshi.com/trade-api/v2, https://external-api.demo.kalshi.co/trade-api/v2, https://demo-api.kalshi.co/trade-api/v2.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 3
Kalshi historical API declares
3 security schemes
for authenticating requests.
An API key is passed in the header as KALSHI-ACCESS-KEY (kalshiAccessKey).
An API key is passed in the header as KALSHI-ACCESS-SIGNATURE (kalshiAccessSignature).
An API key is passed in the header as KALSHI-ACCESS-TIMESTAMP (kalshiAccessTimestamp).
kalshiAccessKey— Your API key IDkalshiAccessSignature— RSA-PSS signature of the requestkalshiAccessTimestamp— Request timestamp in milliseconds
Paths & Operations 7
Across 7 paths, the API surfaces 7 operations — 7 GET. Each is listed below with its method, path, parameters, and response codes.
Schemas 23
The contract defines 23 schemas that model the data the API accepts and returns. The most detailed are Market (55 properties), Order (27 properties), Fill (17 properties), Trade (9 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
More from Kalshi 12
Other APIs Kalshi publishes across the network.