Gemini Trust Company Volume API
Public, unauthenticated prediction-market trade volume by category and UTC period.
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OpenAPI Specification
openapi: 3.2.0
info:
title: Gemini Prediction Markets Volume API
description: 'API for trading prediction market contracts on Gemini.
**Note:** Only fields documented in this specification are considered stable. Undocumented fields in API responses may change or be removed without notice.'
version: 1.0.0
contact:
name: Gemini API Support
servers:
- url: https://api.gemini.com
description: Production
- url: https://api.sandbox.gemini.com
description: Sandbox
tags:
- name: Volume
description: Public, unauthenticated prediction-market trade volume by category and UTC period.
paths:
/v1/prediction-markets/volume/{date}:
get:
tags:
- Volume
summary: Get daily prediction market trade volume
description: 'Returns prediction-market trade volume by category for one completed UTC day. This is a public, unauthenticated endpoint.
`date` must use the `YYYY-MM-DD` UTC calendar-date format. Requests may select one day in the rolling one-year UTC window ending before the current UTC day; the current UTC day is not available. The exact earliest supported date is evaluated for each request.
Prediction-market volume begins at `2025-12-15`. A pre-launch date, or a post-launch date with any missing source hour, returns `404 NOT_FOUND`. The endpoint never synthesizes zero-volume rows for time before launch.
All volume values are non-negative decimal strings. Category rows are flat and ordered with each parent before its descendants. Each category row''s `volume` includes trades assigned directly to that category and to all descendant categories.'
operationId: getPredictionMarketDailyVolume
parameters:
- name: date
in: path
required: true
description: Completed UTC calendar date in `YYYY-MM-DD` format.
schema:
type: string
format: date
responses:
'200':
description: Category volume for the requested UTC day
content:
application/json:
schema:
type: array
items:
$ref: '#/components/schemas/PredictionMarketVolumeCategory'
examples:
dailyVolume:
summary: Daily category volume
value:
- categoryPath:
- Sports
volume: '200097'
- categoryPath:
- Sports
- Soccer
volume: '3952'
'400':
description: Invalid or unsupported date. The message includes the current one-year UTC date bounds.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
examples:
invalidDate:
summary: Date must use the required UTC calendar-date format
value:
error: BAD_REQUEST
message: 'date must use YYYY-MM-DD. Supported one-year UTC date range: <earliest UTC date> <= date < <current UTC date>'
'404':
description: No complete volume data is available for the requested date. This includes dates before prediction markets launched and post-launch dates with a missing source hour.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error: NOT_FOUND
message: Prediction market volume data is not available for the requested date
'503':
description: The canonical source is invalid or temporarily unavailable. The endpoint does not return a partial result.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error: SERVICE_UNAVAILABLE
message: Prediction market volume data is temporarily unavailable
/v1/prediction-markets/volume/{date}/hourly:
get:
tags:
- Volume
summary: Get hourly prediction market trade volume
description: 'Returns prediction-market trade volume by category and UTC hour for one completed UTC day. This is a public, unauthenticated endpoint.
`date` must use the `YYYY-MM-DD` UTC calendar-date format. Requests may select one day in the rolling one-year UTC window ending before the current UTC day; the current UTC day is not available. The exact earliest supported date is evaluated for each request.
Prediction-market volume begins at `2025-12-15`. A pre-launch date, or a post-launch date with any missing source hour, returns `404 NOT_FOUND`. The endpoint never synthesizes zero-volume rows for time before launch or completed zero-volume hours.
All volume values are non-negative decimal strings. Rows are ordered by UTC hour, then with each category parent before its descendants. Each category row''s `volume` includes trades assigned directly to that category and to all descendant categories.'
operationId: getPredictionMarketHourlyVolume
parameters:
- name: date
in: path
required: true
description: Completed UTC calendar date in `YYYY-MM-DD` format.
schema:
type: string
format: date
responses:
'200':
description: Hourly category volume for the requested UTC day
content:
application/json:
schema:
type: array
items:
$ref: '#/components/schemas/PredictionMarketHourlyVolumeCategory'
examples:
hourlyVolume:
summary: Hourly category volume
value:
- periodStart: '2026-07-20T00:00:00Z'
categoryPath:
- Sports
volume: '200097'
- periodStart: '2026-07-20T00:00:00Z'
categoryPath:
- Sports
- Soccer
volume: '3952'
'400':
description: Invalid or unsupported date. The message includes the current one-year UTC date bounds.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
examples:
invalidDate:
summary: Date must use the required UTC calendar-date format
value:
error: BAD_REQUEST
message: 'date must use YYYY-MM-DD. Supported one-year UTC date range: <earliest UTC date> <= date < <current UTC date>'
'404':
description: No complete volume data is available for the requested date. This includes dates before prediction markets launched and post-launch dates with a missing source hour.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error: NOT_FOUND
message: Prediction market volume data is not available for the requested date
'503':
description: The canonical source is invalid or temporarily unavailable. The endpoint does not return a partial result.
content:
application/json:
schema:
$ref: '#/components/schemas/Error'
example:
error: SERVICE_UNAVAILABLE
message: Prediction market volume data is temporarily unavailable
components:
schemas:
PredictionMarketVolumeCategory:
type: object
required:
- categoryPath
- volume
properties:
categoryPath:
type: array
description: Display-name path from the top-level category to this category. It replaces recursive child nodes.
items:
type: string
example:
- Sports
- Football
- Pro Football
volume:
allOf:
- $ref: '#/components/schemas/PredictionMarketVolumeDecimal'
description: Total volume for this category, including all descendant categories.
Error:
type: object
properties:
error:
type: string
description: Error code
example: InvalidInput
message:
type: string
description: Human-readable error message
example: orderId is required
PredictionMarketHourlyVolumeCategory:
type: object
required:
- periodStart
- categoryPath
- volume
properties:
periodStart:
type: string
format: date-time
description: Inclusive UTC start of this hourly period.
example: '2026-07-20T00:00:00Z'
categoryPath:
type: array
description: Display-name path from the top-level category to this category. It replaces recursive child nodes.
items:
type: string
example:
- Sports
- Football
- Pro Football
volume:
allOf:
- $ref: '#/components/schemas/PredictionMarketVolumeDecimal'
description: Total volume for this category in this hour, including all descendant categories.
PredictionMarketVolumeDecimal:
type: string
pattern: ^(?:0|[1-9][0-9]*)(?:\.[0-9]+)?$
description: Non-negative decimal string. Preserve it as a string to avoid floating-point precision loss.
example: '143567.25'
securitySchemes:
apiKey:
type: apiKey
in: header
name: X-GEMINI-APIKEY
description: Gemini API key with appropriate permissions
payloadAuth:
type: apiKey
in: header
name: X-GEMINI-PAYLOAD
description: Base64-encoded private REST payload. See Gemini private REST authentication.
signatureAuth:
type: apiKey
in: header
name: X-GEMINI-SIGNATURE
description: Hex HMAC-SHA384 signature of the payload using the API secret.