Add Binary Markets(Head-to-Head Binary Market)

Issue #61 | State: CLOSED | Created: 2026-01-16T04:35:44Z

Assignees: Abdulkarim4u

Updated: 2026-01-30T07:22:09Z | Closed: 2026-01-30T07:22:09Z

Context

We currently support Yes/No (proposition) binary markets, where users trade on whether an event will occur.

Example:

• "Will Bitcoin exceed $100k by Dec 2025?" → Yes / No

However, many real-world prediction markets are head-to-head (A vs B), where users choose between two mutually exclusive outcomes.

Example:

• "Who will win the football match?" → England vs Ghana

Proposal

Introduce a new binary market type that supports two named outcomes (A vs B) instead of Yes/No.

Key Differences from Yes/No Binary

• Outcomes are labeled entities (e.g. Team A vs Team B)
• No implicit "No" outcome
• Pricing still sums to 1.0 (or 100%)
• Resolution selects exactly one winning outcome

Expected Scope

• Market schema update to support labeled binary outcomes
• Market creation flow for A vs B markets
• Pricing & trade logic reuse from existing binary implementation
• Frontend UI updates to display A vs B options clearly
• Resolution logic for head-to-head markets

Example Market

• Title: Who will win the match?
• Outcomes: England, Ghana
• Market Type: Binary (Head-to-Head)