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Gemini Trust Company Combos API

Public endpoints for discovering and inspecting combo contracts, plus an authenticated endpoint to create or retrieve a canonical combo. Combos are multi-leg contracts; order entry uses the same place/cancel endpoints as single contracts.

Gemini Trust Company Combos 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 Combos. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, and an API reference.

This API exposes 3 operations across 2 paths, and defines 13 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.

3 operations 2 paths 13 schemas 2 GET1 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0.0
Base URL
https://api.gemini.com
Authentication
API Key, API Key, API Key
Contact
Gemini API Support
Resource Areas
1

Authentication & Security 3

Gemini Trust Company Combos 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 permissions
  • payloadAuth — Base64-encoded private REST payload. See Gemini private REST authentication.
  • signatureAuth — Hex HMAC-SHA384 signature of the payload using the API secret.

Paths & Operations 3

Across 2 paths, the API surfaces 3 operations — 2 GET, 1 POST. Each is listed below with its method, path, parameters, and response codes.

Combos 3

Public endpoints for discovering and inspecting combo contracts, plus an authenticated endpoint to create or retrieve a canonical combo. Combos are multi-leg contracts; order entr…

GET
/v1/prediction-markets/combos
List combo contracts
listCombos 5 params → 200400500503
POST
/v1/prediction-markets/combos
Create or retrieve a canonical combo
createCombo body → 200201400401403404500
GET
/v1/prediction-markets/combos/{instrumentSymbol}
Get combo by instrument symbol
getComboByInstrumentSymbol 1 param → 200404500503

Schemas 13

The contract defines 13 schemas that model the data the API accepts and returns. The most detailed are ContractMetadata (13 properties), ComboSummary (12 properties), ComboLeg (7 properties), ComboSummaryLeg (7 properties). Each schema is shown below with its type and property counts.

ComboLeg
object
7 properties 4 required
Error
object
2 properties
CreateComboLeg
object
2 properties 2 required
ComboSummary
object
12 properties 5 required
ComboWriteError
object
3 properties 2 required
ComboResponse
object
2 properties 2 required
AuthErrorResponse
object
3 properties 3 required
Pagination
object
3 properties
CreateComboResponse
object
2 properties 2 required
CreateComboRequest
object
A canonical combo definition. The authenticated account is derived from the signed request and is not a request field.
1 property 1 required
ListCombosResponse
object
2 properties 2 required
ContractMetadata
object
13 properties
ComboSummaryLeg
object
7 properties 4 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

gemini-trust-combos-api-openapi.yml Raw ↑

Other APIs Gemini Trust Company publishes across the network.

Gemini WebSocket API
Gemini MCP Server
Gemini Trust Company Account Administration API
Gemini Trust Company Clearing API
Gemini Trust Company Derivatives API
Gemini Trust Company Fund Management API
Gemini Trust Company Instant API
Gemini Trust Company Margin Trading API
Gemini Trust Company Market Data API
Gemini Trust Company Markets API
Gemini Trust Company OAuth API
Gemini Trust Company Orders API
Where this information came from

This is an independent, third-party profile of Gemini Trust Company Combos API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

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