> ## Documentation Index > Fetch the complete documentation index at: https://api.synthesis.trade/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get Similar Market Pairs > Fetch cross-venue market pairs surfaced by the similarity index. ## OpenAPI ````yaml /openapi.json get /api/v1/markets/similar-pairs openapi: 3.1.0 info: title: Synthesis API version: 1.0.0 description: Unified prediction market API for Polymarket and Kalshi. servers: - url: https://synthesis.trade security: [] tags: - name: Projects description: Create and manage project accounts, sessions, and account API keys. - name: Accounts description: >- Authenticate and manage account-level sessions, account API keys, and public account preferences. - name: Markets description: Unified market discovery and analytics across Polymarket and Kalshi. - name: Polymarket description: Polymarket market data, prices, orderbooks, trades, and holders endpoints. - name: Kalshi description: Kalshi market data, events, history, leaderboard, and profile endpoints. - name: Wallets description: Wallet management routes. Each wallet supports multiple chains. - name: Polygon description: >- Polygon wallet routes for balances, orders, minting, redemption, withdrawals, and swaps. - name: Polygon Copytrades description: Polymarket copytrade configuration and management for Polygon wallets. - name: Solana description: >- Solana wallet routes used for Kalshi balances, KYC, orders, redemption, and withdrawals. - name: News description: News endpoints with market and event matching. - name: WebSockets description: >- Real-time streaming endpoints for orderbooks, trades, balances, and live data feeds. paths: /api/v1/markets/similar-pairs: get: tags: - Markets summary: Get Similar Market Pairs description: Fetch cross-venue market pairs surfaced by the similarity index. operationId: get-similar-market-pairs parameters: - name: sort in: query required: false description: Sort field. schema: type: string default: arbitrage example: ends_at - name: order in: query required: false description: Sort direction. schema: type: string default: DESC example: ASC - name: limit in: query required: false description: Maximum pairs to return. schema: type: integer default: 25 example: 25 - name: offset in: query required: false description: Pagination offset. schema: type: integer default: 0 example: 0 responses: '200': description: Similar market pairs content: application/json: example: success: true response: - source: venue: polymarket event: event_id: 12345 title: Will Bitcoin reach $100k by end of 2025? slug: will-bitcoin-reach-100k-by-end-of-2025 description: >- This market resolves to Yes if spot Bitcoin trades at or above $100,000 before 2025 ends. image: https://example.com/bitcoin.png tags: - crypto - bitcoin labels: - crypto - macro neg_risk: false active: true liquidity: '1500000' volume: '5000000' volume24hr: '250000' volume1wk: '900000' volume1mo: '2200000' volume1yr: '5000000' live: live: false ended: false created_at: '2026-01-01T00:00:00' updated_at: '2026-01-01T00:00:00' ends_at: '2026-12-31T23:59:59' markets: - event_id: 12345 condition_id: >- 0xbd71b43bb47eb60dbcb41fa25df2a0ed4da612873d6e0447a2c730bd4cc25910 question: Will Bitcoin reach $100k? outcome: 'Yes' slug: will-bitcoin-reach-100k-yes description: >- Buy Yes if you think Bitcoin will trade at or above $100,000 before market expiry. image: https://example.com/bitcoin-market.png left_outcome: 'Yes' right_outcome: 'No' left_price: '0.65' right_price: '0.35' left_token_id: >- 21742633143463906290569050155826241533067272736897614950488156847949938836455 right_token_id: >- 48572956138472615938471625938471659384716593847165938471659384716593847165938 winner_token_id: '' active: true resolved: false fees: true decimals: 6 liquidity: '1500000' volume: '5000000' volume24hr: '250000' volume1wk: '900000' volume1mo: '2200000' volume1yr: '5000000' rewards: rewards: false created_at: '2026-01-01T00:00:00' updated_at: '2026-01-01T00:00:00' ends_at: '2026-12-31T23:59:59' market_id: >- 0xbd71b43bb47eb60dbcb41fa25df2a0ed4da612873d6e0447a2c730bd4cc25910 target: venue: kalshi event: series_id: KXBTC event_id: KXBTC-25 title: Bitcoin above $100,000 on Dec 31? sub_title: Expires at year end slug: bitcoin-above-100000-on-dec-31 image: https://example.com/kalshi-bitcoin.png tags: - crypto - bitcoin labels: - crypto - macro category: Crypto active: true liquidity: '800000' volume: '3000000' live: is_active: true created_at: '2026-01-01T00:00:00' updated_at: '2026-01-01T00:00:00' ends_at: '2026-12-31T23:59:59' markets: - series_id: KXBTC event_id: KXBTC-25 market_id: KXBTC-25-T100000 kalshi_id: T100000 title: Bitcoin above $100,000? outcome: 'Yes' description: >- Resolves Yes if Bitcoin settles above $100,000 on expiration. image: https://example.com/kalshi-bitcoin-market.png left_outcome: 'Yes' right_outcome: 'No' left_price: '0.58' right_price: '0.42' left_token_id: BRjpCHtyQLeSRWyE1yTdBQbhLkny5oEnveRijBjRoiA right_token_id: F4r2GpoNU8MBMdKqP6MCBzKEHe2Mt8s5qm4GrFcJQnbJ winner_token_id: '' active: true resolved: false claimable: false liquidity: '800000' open_interest: '1200000' volume: '3000000' volume24hr: '175000' dflow: enabled: true created_at: '2026-01-01T00:00:00' updated_at: '2026-01-01T00:00:00' ends_at: '2026-12-31T23:59:59' market_id: KXBTC-25-T100000 distance: 0.42 arbitrage: 0.02 volume: 3000000 liquidity: 800000 ends_at: '2026-12-31T23:59:59' created_at: '2026-01-01T00:00:00' security: [] ````