> ## Documentation Index > Fetch the complete documentation index at: https://rekko.ai/docs/llms.txt > Use this file to discover all available pages before exploring further. # Arbitrage Feed > Get cached arbitrage opportunities with composite scoring. ## OpenAPI ````yaml GET /v1/arbitrage openapi: 3.1.0 info: title: Rekko AI — Prediction Market Intelligence description: >- The brain for prediction market trading. Deep AI research, Bayesian causal decomposition, portfolio-aware strategy signals, cross-platform arbitrage, and execution guidance — all in one API. Covers Kalshi, Polymarket, Robinhood, and Coinbase. Clean flat JSON designed for developers and autonomous trading agents. contact: name: Rekko AI url: https://rekko.ai/ license: name: Proprietary version: 1.0.0 servers: - url: https://api.rekko.ai security: [] tags: - name: Markets description: Prediction market listings, history, resolution, and execution guidance - name: Insights description: AI-powered research insights with causal decomposition - name: Strategy description: >- Actionable trading signals with Kelly-derived position sizing and causal decomposition - name: Portfolio description: Portfolio-aware strategy, correlation analysis, and hedge recommendations - name: Arbitrage description: Cross-platform arbitrage detection (Kalshi vs Polymarket vs Robinhood) - name: Analytics description: Calibration metrics, sentiment, and performance tracking - name: Streaming description: Real-time SSE event stream and webhooks - name: Consensus description: Agent trade aggregation and crowd probability paths: /v1/arbitrage: get: tags: - Arbitrage summary: Get arbitrage opportunities description: Get cached arbitrage opportunities with composite scoring. operationId: /v1/arbitrage parameters: - name: min_spread in: query required: false schema: type: number maximum: 0.5 minimum: 0 description: Minimum spread filter default: 0.02 title: Min Spread description: Minimum spread filter - name: expand in: query required: false schema: type: string description: Comma-separated expansions default: '' title: Expand description: Comma-separated expansions responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/ArbitrageResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' components: schemas: ArbitrageResponse: properties: scanned_at: type: string format: date-time title: Scanned At description: Exact scan timestamp count: type: integer title: Count description: Number of opportunities default: 0 opportunities: items: $ref: '#/components/schemas/ArbitrageOpportunity' type: array title: Opportunities description: Opportunities ranked by score (highest first) type: object required: - scanned_at title: ArbitrageResponse description: Cross-platform arbitrage scan results. example: count: 1 opportunities: - cheaper_on: kalshi event: Fed rate cut March 2026 kalshi: market_id: KXFED-26MAR19 url: https://kalshi.com/markets/kxfed/kxfed-26mar19 yes_price: 0.62 match_confidence: 0.92 polymarket: market_id: '0x1234abcd' url: https://polymarket.com/event/fed-rate-cut-march-2026 yes_price: 0.68 scanned_at: '2026-03-21T14:30:00Z' score: 78 spread: 0.06 spread_pct: 6 scanned_at: '2026-03-21T14:30:00Z' HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError ArbitrageOpportunity: properties: event: type: string title: Event description: Matched event title kalshi: $ref: '#/components/schemas/ArbitragePlatformSide' description: Kalshi side polymarket: $ref: '#/components/schemas/ArbitragePlatformSide' description: Polymarket side spread: type: number minimum: 0 title: Spread description: Absolute price spread spread_pct: type: number minimum: 0 title: Spread Pct description: Spread as percentage (e.g. 5.0 = 5%) cheaper_on: type: string title: Cheaper On description: Platform with lower YES price score: type: number maximum: 100 minimum: 0 title: Score description: Composite quality score (0-100) match_confidence: type: number maximum: 1 minimum: 0 title: Match Confidence description: Fuzzy title match confidence spread_score: anyOf: - type: number maximum: 100 minimum: 0 - type: 'null' title: Spread Score description: Score from spread magnitude (40% weight) liquidity_score: anyOf: - type: number maximum: 100 minimum: 0 - type: 'null' title: Liquidity Score description: Score from combined platform liquidity (20% weight) match_confidence_score: anyOf: - type: number maximum: 100 minimum: 0 - type: 'null' title: Match Confidence Score description: Score from title match quality (20% weight) execution_score: anyOf: - type: number maximum: 100 minimum: 0 - type: 'null' title: Execution Score description: Score from execution feasibility (20% weight) scanned_at: type: string format: date-time title: Scanned At description: When this opportunity was detected type: object required: - event - kalshi - polymarket - spread - spread_pct - cheaper_on - score - match_confidence - scanned_at title: ArbitrageOpportunity description: Cross-platform arbitrage opportunity with composite scoring. example: cheaper_on: kalshi event: Fed rate cut March 2026 kalshi: market_id: KXFED-26MAR19 url: https://kalshi.com/markets/kxfed/kxfed-26mar19 yes_price: 0.62 match_confidence: 0.92 polymarket: market_id: '0x1234abcd' url: https://polymarket.com/event/fed-rate-cut-march-2026 yes_price: 0.68 scanned_at: '2026-03-21T14:30:00Z' score: 78 spread: 0.06 spread_pct: 6 ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type input: title: Input ctx: type: object title: Context type: object required: - loc - msg - type title: ValidationError ArbitragePlatformSide: properties: market_id: type: string title: Market Id description: Platform-specific market identifier yes_price: type: number maximum: 1 minimum: 0 title: Yes Price description: YES probability url: type: string title: Url description: Market URL default: '' type: object required: - market_id - yes_price title: ArbitragePlatformSide description: One side of an arbitrage opportunity. example: market_id: KXFED-26MAR19 url: https://kalshi.com/markets/kxfed/kxfed-26mar19 yes_price: 0.62 ````