Gemini Trust Company Markets API
Public endpoints for browsing prediction markets.**Market Data:** Use these REST endpoints to discover active events and each contract's `instrumentSymbol` (e.g., `GEMI-FEDJAN26-DN25`). For active trading and market making, prefer [Prediction Markets WebSocket streams](/prediction-markets/websocket/streams) with that `instrumentSymbol`.- [List Events](/rest-api/prediction-markets/events/list-events) - Discover active events and instrument symbols- [Prediction Markets WebSocket Streams](/prediction-markets/websocket/streams) - Stream prices, depth, order events, and positions
Gemini Trust Company Markets API is one of 20 APIs that Gemini Trust Company publishes on the APIs.io network, described by a machine-readable OpenAPI specification.
Tagged areas include Markets. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.
This API exposes 7 operations across 7 paths, and defines 26 schemas. It is described by OpenAPI 3.2.0, at version 1.0.0.
Requests are made against 2 base URLs: https://api.gemini.com, https://api.sandbox.gemini.com.
Metadata
The identity and technical contract details declared by the specification.
Authentication & Security 3
Gemini Trust Company Markets API declares
3 security schemes
for authenticating requests.
An API key is passed in the header as X-GEMINI-APIKEY (apiKey).
An API key is passed in the header as X-GEMINI-PAYLOAD (payloadAuth).
An API key is passed in the header as X-GEMINI-SIGNATURE (signatureAuth).
apiKey— Gemini API key with appropriate permissionspayloadAuth— Base64-encoded private REST payload. See Gemini private REST authentication.signatureAuth— Hex HMAC-SHA384 signature of the payload using the API secret.
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.
Public endpoints for browsing prediction markets. Market Data: Use these REST endpoints to discover active events and each contract's instrumentSymbol (e.g., GEMI-FEDJAN26-DN25).…
Schemas 26
The contract defines 26 schemas that model the data the API accepts and returns. The most detailed are Contract (27 properties), Event (25 properties), NestedEvent (24 properties), ContractPrices (5 properties). Each schema is shown below with its type and property counts.
Specification
The full machine-readable OpenAPI contract behind this narrative.
Source
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Other APIs Gemini Trust Company publishes across the network.
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