Tickers

Crypto Ticker Format

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Overview

Crypto prediction market tickers follow a standard Gemini format for price threshold contracts:

Code
 
GEMI-{Event}-{Contract}

Ticker Structure

Component	Description	Example
GEMI	Gemini prediction market prefix	GEMI
Event	Underlying asset + optional duration + expiry datetime	BTC2603230800 or BTC05M2602251745
Contract	Price threshold condition	HI105000 or UP

Full Ticker Examples:

• GEMI-BTC2603230800-HI105000 (daily contract)
• GEMI-BTC05M2602251745-UP (5-minute contract)
• GEMI-BTC15M2602251745-UP (15-minute contract)

Event Format

The event identifies the underlying crypto asset and its expiry.

Structure

Code
 
{UNDERLYING}[{DURATION}]{EXPIRY}

Components

Component	Format	Description
UNDERLYING	[A-Z]+	Crypto asset symbol (e.g., BTC, ETH, SOL, XRP)
DURATION	05M or 15M	Optional. Duration marker for 5-minute or 15-minute interval contracts. Omitted for all other durations.
EXPIRY	YYMMDDHHmm	Expiry date and time in UTC

Expiry Format

Code
 
YYMMDDHHmm

Position	Part	Description
1-2	YY	Year (e.g., 26 for 2026)
3-4	MM	Month (01-12)
5-6	DD	Day (01-31)
7-8	HH	Hour in 24hr UTC (00-23)
9-10	mm	Minute (00-59)

Examples:

• BTC2603230800 = BTC expiring March 23, 2026 08:00 UTC
• BTC05M2602251745 = BTC 5-minute contract expiring February 25, 2026 17:45 UTC
• BTC15M2602251745 = BTC 15-minute contract expiring February 25, 2026 17:45 UTC

Duration Markers

For 5-minute and 15-minute interval contracts only, a duration marker is inserted after the underlying asset symbol:

Duration	Marker	Format	Example Event
5 minutes	05M	{UNDERLYING}05M{EXPIRY}	BTC05M2602251745
15 minutes	15M	{UNDERLYING}15M{EXPIRY}	BTC15M2602251745
All others	(none)	{UNDERLYING}{EXPIRY}	BTC2603230800

Supported Underlyings

Asset	Symbol	Description
Bitcoin	BTC	Bitcoin price in USD
Ethereum	ETH	Ethereum price in USD
Solana	SOL	Solana price in USD
XRP	XRP	XRP price in USD

Contract Format

Gemini crypto prediction contracts use one of two contract types depending on the duration:

Contract Type	Format	Used For	Strike Price Source
UP	UP	Short-duration contracts (5-minute, 15-minute)	API response
HI{PRICE}	HI + encoded price	Daily and longer contracts	Embedded in ticker

UP Contract (Short-Duration)

For 5-minute and 15-minute contracts, the contract segment is UP. An UP contract resolves YES if the underlying asset's price is at or above the strike price at expiry. The strike price is the asset's price at the start of the contract window and is not encoded in the ticker.

Code
 
UP

HI{PRICE} Contract (Daily and Longer)

For daily and longer-duration contracts, the strike price is encoded directly in the ticker.

Code
 
HI{PRICE}

Component	Description
HI	Greater than or equal to (>=) indicator
PRICE	Strike price as integer, with D as decimal delimiter

Price Encoding (HI contracts only)

• Whole numbers are entered as-is: 105000 = $105,000
• Decimals use D as delimiter: 2D20 = $2.20

Price	Encoded
$105,000	HI105000
$2.20	HI2D20
$0.50	HI0D50
$3,500.25	HI3500D25

Complete Examples

BTC Contract (Daily)

BTC $105,000 or above, expiring March 23, 2026 08:00 UTC

Component	Value
Prefix	GEMI
Underlying	BTC
Expiry	2603230800
Contract	HI105000
Full Ticker	GEMI-BTC2603230800-HI105000

BTC Contract (5-Minute)

BTC UP, expiring February 25, 2026 17:45 UTC (5-minute interval)

Component	Value
Prefix	GEMI
Underlying	BTC
Duration	05M
Expiry	2602251745
Contract	UP
Full Ticker	GEMI-BTC05M2602251745-UP

BTC Contract (15-Minute)

BTC UP, expiring February 25, 2026 17:45 UTC (15-minute interval)

Component	Value
Prefix	GEMI
Underlying	BTC
Duration	15M
Expiry	2602251745
Contract	UP
Full Ticker	GEMI-BTC15M2602251745-UP

XRP Contract

XRP $2.20 or above, expiring March 23, 2026 15:00 UTC

Component	Value
Prefix	GEMI
Underlying	XRP
Expiry	2603231500
Contract	HI2D20
Full Ticker	GEMI-XRP2603231500-HI2D20

ETH Contract

ETH $4,500 or above, expiring April 1, 2026 12:00 UTC

Component	Value
Prefix	GEMI
Underlying	ETH
Expiry	2604011200
Contract	HI4500
Full Ticker	GEMI-ETH2604011200-HI4500

SOL Contract

SOL $250.50 or above, expiring February 28, 2026 16:00 UTC

Component	Value
Prefix	GEMI
Underlying	SOL
Expiry	2602281600
Contract	HI250D50
Full Ticker	GEMI-SOL2602281600-HI250D50

Regex Patterns

Full Ticker

Code
 
^GEMI-([A-Z]+)(?:(05M|15M))?(\d{10})-(UP|HI(\d+(?:D\d+)?))$

Capture Groups:

1. Underlying asset
2. Duration marker (optional: 05M or 15M)
3. Expiry (YYMMDDHHmm)
4. Contract (UP or full HI{PRICE})
5. Price (with optional decimal, only present for HI contracts)

This pattern validates ticker structure only. To validate that the contract type matches the duration (e.g., UP for short-duration, HI for daily and longer), apply additional logic after parsing.

Event Only

Code
 
^([A-Z]+)(?:(05M|15M))?(\d{10})$

Capture Groups:

1. Underlying asset
2. Duration marker (optional: 05M or 15M)
3. Expiry (YYMMDDHHmm)

Contract Only

Code
 
^(UP|HI(\d+(?:D\d+)?))$

Validation Rules

1. Ticker must start with GEMI-
2. Underlying must be a valid crypto asset symbol
3. Duration marker, if present, must be exactly 05M or 15M
4. Expiry must be a valid future UTC datetime
5. For new contracts, UP is used for short-duration and HI{PRICE} for daily and longer. Legacy short-duration contracts may still use HI{PRICE}.
6. Price decimal delimiter must be D (not .) for HI contracts

Changelog

Version	Effective Date	Changes
1.2	2026-04-08	Short-duration contracts (5-min, 15-min) use UP contract type; strike price moved to API response. Legacy HI{PRICE} format deprecated for these durations.
1.1	2026-02-25	Added duration markers for 5-minute (05M) and 15-minute (15M) interval contracts
1.0	2026-02-13	Initial specification