> ## Documentation Index > Fetch the complete documentation index at: https://docs.delphimarkets.com/llms.txt > Use this file to discover all available pages before exploring further. # Semantic Market Search > Search markets by meaning using AI-powered semantic search. Unlike keyword search, this understands natural language queries like "will interest rates go down" and finds relevant markets even if they use different wording. Uses hybrid scoring that combines: - **Semantic similarity** — matches meaning using embeddings across both market titles and rules - **Keyword boost** — exact keyword matches in titles get a relevance boost Searches across all supported exchanges: Kalshi, Polymarket, Limitless, Predict.fun, Opinion Labs, Gemini, Manifold, ForecastEx, and PredictIt. Requires Max, Admin, or Enterprise plan. ## Use cases - Find markets using natural language descriptions - Discover markets you wouldn't find with keyword search - Search by concept rather than exact market titles - Cross-exchange market discovery by topic ## Example - Request: `POST /api/v1/search/semantic` - Header: `X-API-Key: YOUR_API_KEY` - Body: `{"query": "fed rate cuts by summer", "active_only": true, "limit": 10}` ## OpenAPI ````yaml /openapi.json post /api/v1/search/semantic openapi: 3.0.3 info: title: Delphi Markets API description: >- Welcome to Delphi Markets API The Delphi Markets API provides unified access to prediction market data from **Kalshi (KLSI)** and **Polymarket (POLY)** exchanges. Quick Start: 1. **Get a test API key** - Click on `POST /api/v1/test-key` below and hit 'Try it' 2. **Copy your key** - Save the `api_key` from the response 3. **Authorize** - Click 'Authorize' in the sidebar and paste your key 4. **Start exploring** - Try any endpoint! What You Can Build: - **Trading Bots**: Access real-time orderbook data and trade history - **Market Analytics**: Analyze market movements, spreads, and liquidity - **Research Tools**: Search and filter across thousands of prediction markets - **Price Feeds**: Get live pricing data for any market --- Authentication: All API requests require an API key passed in the `X-API-Key` header: Example request: GET `/api/v1/klsi/markets` Header: X-API-Key: dphi_live_your_key_here Getting an API Key: | Type | Duration | Rate Limit | How to Get | |------|----------|------------|------------| | Test Key | 10 minutes | 60 req/min | `POST /api/v1/test-key` | | Production Key | Permanent | 300 req/min | Contact us | --- Rate Limits: Requests are rate-limited per API key: - **Test keys**: 60 requests per minute - **Production keys**: 300 requests per minute When you exceed the limit, you'll receive a `429 Too Many Requests` response. Wait and retry. --- Error Codes: | Code | Meaning | |------|---------------| | 400 | Bad Request - Invalid parameters | | 401 | Unauthorized - Missing or invalid API key | | 404 | Not Found - Resource doesn't exist | | 429 | Too Many Requests - Rate limit exceeded | | 500 | Server Error - Something went wrong | All errors return JSON with an `error` field: {"error": "invalid api key format"} --- Support: For production API keys or support, visit [delphimarkets.com](delphimarkets.com). version: 1.0.0 contact: name: Delphi Markets url: https://delphimarkets.com x-logo: url: https://delphimarkets.com/logo.png servers: - url: https://api.delphiterminal.co description: Delphi Markets API security: - ApiKeyAuth: [] tags: - name: Getting Started description: >- Start here to get a test API key and begin experimenting with the API. Test keys are valid for 10 minutes. - name: Health description: Health check endpoint to verify the API is operational. - name: Auth description: >- User authentication endpoints for creating accounts and managing sessions. Note: These are separate from API key authentication. - name: Search description: >- Search across all markets and events. Includes autocomplete suggestions for building search interfaces. - name: Delphi description: >- Cross-exchange market matching via Delphi IDs. Look up cluster metadata and find equivalent markets across all supported exchanges. - name: Clusters description: >- Cross-exchange market matching. Markets asking the same question across Kalshi, Polymarket, Limitless, and PFun are grouped into clusters. Use these endpoints to discover equivalent markets for arbitrage, hedging, and cross-exchange analytics. - name: KLSI description: >- Access Kalshi (KLSI) prediction market data including market details, orderbooks, trade history, and analytics. Kalshi is a US-regulated prediction market exchange. - name: Polymarket description: >- Access Polymarket (POLY) prediction market data including market details, orderbooks, and trade history. Polymarket is a decentralized prediction market platform. - name: Limitless description: >- Access Limitless exchange prediction market data including orderbooks. Limitless is a prediction market platform. - name: Predict.fun description: >- Access Predict.fun exchange prediction market data including price history. - name: Opinion Labs description: >- Access Opinion Labs prediction market data including market details, orderbooks, price history, and trade history. - name: Gemini description: >- Access Gemini prediction market data including market details, orderbooks, price history, and trade history. - name: Manifold description: >- Access Manifold prediction market data including market details, orderbooks, price history, and trade history. - name: ForecastEx description: >- Access ForecastEx prediction market data including market details and trade history. - name: PredictIt description: >- Access PredictIt prediction market data including market details and price history. - name: Events description: >- Events group related markets together. Use these endpoints to browse events by category or find all markets within an event. - name: Candles description: >- OHLCV (Open, High, Low, Close, Volume) candle data across exchanges. Supports multiple time intervals: 1s, 1m, 5m, 10m, 1h, 1d. Currently available for Kalshi (KLSI) with more exchanges coming soon. - name: Advanced Analytics description: >- Advanced orderbook analytics and price data. These endpoints provide deeper market insights including historical spreads, liquidity metrics, and best quote time series. - name: Trading description: >- Place, query, and cancel orders across all supported prediction-market exchanges (Polymarket, Kalshi, Opinion Labs, Gemini, Limitless, Predict.fun). **Important — client-side signing required for on-chain exchanges.** Polymarket, Opinion Labs, Limitless, and Predict.fun use EIP-712 signed orders. The signature must be produced on your machine using your private key — the Delphi server never has access to it. Use the `@delphimarkets/sdk` `build*Order()` helpers to construct a valid `signed_order` payload. Raw HTTP calls to `POST /orders` will be rejected by the exchange unless `signed_order` contains a valid signature. - name: Credentials description: >- Register and inspect your stored exchange credentials. Each user has at most one credential set per exchange. Credentials are encrypted at rest and used by the server when forwarding orders to centralized exchanges (Kalshi, Gemini) or for credential-derivation flows (Polymarket). - name: Polymarket Onboarding description: >- One-time helpers for Polymarket: derive CLOB HMAC credentials from an EOA private key, verify stored credentials are still valid, and look up the Gnosis Safe (proxy) address for an EOA. Use these once per user before placing your first Polymarket order. paths: /api/v1/search/semantic: post: tags: - Search summary: Semantic Market Search description: >- Search markets by meaning using AI-powered semantic search. Unlike keyword search, this understands natural language queries like "will interest rates go down" and finds relevant markets even if they use different wording. Uses hybrid scoring that combines: - **Semantic similarity** — matches meaning using embeddings across both market titles and rules - **Keyword boost** — exact keyword matches in titles get a relevance boost Searches across all supported exchanges: Kalshi, Polymarket, Limitless, Predict.fun, Opinion Labs, Gemini, Manifold, ForecastEx, and PredictIt. Requires Max, Admin, or Enterprise plan. ## Use cases - Find markets using natural language descriptions - Discover markets you wouldn't find with keyword search - Search by concept rather than exact market titles - Cross-exchange market discovery by topic ## Example - Request: `POST /api/v1/search/semantic` - Header: `X-API-Key: YOUR_API_KEY` - Body: `{"query": "fed rate cuts by summer", "active_only": true, "limit": 10}` requestBody: required: true content: application/json: schema: type: object required: - query properties: query: type: string description: Natural language search query. example: fed rate cuts by summer exchange: type: array items: type: string enum: - kalshi - polymarket - limitless - predictfun - opinion - gemini - manifold - forecastex - predictit description: >- Filter to specific exchanges. If omitted, searches all exchanges. active_only: type: boolean default: false description: If true, only returns markets that are not closed. category: type: string description: >- Filter to a specific category (e.g., Politics, Crypto, Sports). limit: type: integer default: 20 maximum: 100 description: Maximum number of results to return. responses: '200': description: Ranked search results with similarity scores content: application/json: schema: type: object properties: query: type: string description: The original search query. count: type: integer description: Number of results returned. results: type: array items: type: object properties: market_id: type: string description: Exchange-specific market identifier. exchange: type: string description: Exchange name. title: type: string description: Market title. category: type: string description: Market category. closed: type: boolean description: Whether the market is closed. score: type: number description: >- Similarity score (lower is more relevant). Combines semantic similarity and keyword match boost. delphi_id: type: string description: Delphi cross-exchange cluster ID, if available. '400': description: Invalid request (missing query) content: application/json: schema: type: object properties: error: type: string '403': description: Plan does not have access (requires Max or above) content: application/json: schema: type: object properties: error: type: string components: securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: Your API key (get one from the test-key endpoint above) ````