> ## Documentation Index > Fetch the complete documentation index at: https://docs.kalshi.com/llms.txt > Use this file to discover all available pages before exploring further. # Market Ticker > Market price, volume, and open interest updates. **Requirements:** - No additional channel-level authentication beyond the authenticated WebSocket connection - Market specification optional (omit to receive all markets) - Supports `market_ticker`/`market_tickers` and `market_id`/`market_ids` - Updates sent whenever any ticker field changes **Use case:** Displaying current market prices and statistics ## AsyncAPI ````yaml asyncapi.yaml ticker id: ticker title: Market Ticker description: > Market price, volume, and open interest updates. **Requirements:** - No additional channel-level authentication beyond the authenticated WebSocket connection - Market specification optional (omit to receive all markets) - Supports `market_ticker`/`market_tickers` and `market_id`/`market_ids` - Updates sent whenever any ticker field changes **Use case:** Displaying current market prices and statistics servers: - id: production protocol: wss host: external-api-ws.kalshi.com bindings: [] variables: [] address: ticker parameters: [] bindings: [] operations: - &ref_1 id: receiveTicker title: Ticker Update description: Receive market ticker updates type: send messages: - &ref_2 id: ticker contentType: application/json payload: - name: Ticker Update description: Market price ticker information type: object properties: - name: type type: string description: ticker required: true - name: sid type: integer description: >- Server-generated subscription identifier (sid) used to identify the channel required: true - name: msg type: object required: true properties: - name: market_id type: string description: Unique market UUID required: true - name: market_ticker type: string description: Unique market identifier examples: &ref_0 - FED-23DEC-T3.00 - HIGHNY-22DEC23-B53.5 required: true - name: price_dollars type: string description: Last traded price in dollars required: true - name: yes_bid_dollars type: string description: Best bid price for yes side in dollars required: true - name: yes_ask_dollars type: string description: Best ask price for yes side in dollars required: true - name: volume_fp type: string description: Fixed-point total contracts traded (2 decimals) required: true - name: open_interest_fp type: string description: Fixed-point open interest (2 decimals) required: true - name: dollar_volume type: integer description: Signed whole-dollar cumulative traded notional required: true - name: dollar_open_interest type: integer description: Signed whole-dollar open-interest notional required: true - name: yes_bid_size_fp type: string description: Fixed-point contracts at best bid (2 decimals) required: true - name: yes_ask_size_fp type: string description: Fixed-point contracts at best ask (2 decimals) required: true - name: last_trade_size_fp type: string description: Fixed-point contracts in last trade (2 decimals) required: true - name: ts type: integer description: >- Deprecated - Unix timestamp for when the update happened (in seconds). Use ts_ms instead. deprecated: true required: true - name: ts_ms type: integer description: >- Unix timestamp for when the update happened (in milliseconds) required: true - name: time type: string description: >- Deprecated - Timestamp for when the update happened (RFC3339, truncated to milliseconds). Use ts_ms instead. deprecated: true required: true - name: sending_ts_ms type: integer description: >- Unix timestamp in milliseconds when Kalshi queued this message at the network layer. required: false headers: [] jsonPayloadSchema: type: object required: - type - sid - msg properties: type: type: string const: ticker x-parser-schema-id: sid: type: integer description: >- Server-generated subscription identifier (sid) used to identify the channel minimum: 1 x-parser-schema-id: subscriptionId msg: type: object required: - market_id - market_ticker - price_dollars - yes_bid_dollars - yes_ask_dollars - volume_fp - open_interest_fp - dollar_volume - dollar_open_interest - yes_bid_size_fp - yes_ask_size_fp - last_trade_size_fp - ts - ts_ms - time properties: market_id: type: string description: Unique market UUID format: uuid x-parser-schema-id: marketId market_ticker: type: string description: Unique market identifier examples: *ref_0 x-parser-schema-id: marketTicker price_dollars: type: string description: Last traded price in dollars x-rust-type: common::types::Price x-rust-serialize-with: ws::dto::serde_money::serialize_price_dollars x-parser-schema-id: yes_bid_dollars: type: string description: Best bid price for yes side in dollars x-rust-type: common::types::Price x-rust-serialize-with: ws::dto::serde_money::serialize_price_dollars x-parser-schema-id: yes_ask_dollars: type: string description: Best ask price for yes side in dollars x-rust-type: common::types::Price x-rust-serialize-with: ws::dto::serde_money::serialize_price_dollars x-parser-schema-id: volume_fp: type: string description: Fixed-point total contracts traded (2 decimals) x-rust-type: i64 x-rust-serialize-with: ws::dto::serde_money::serialize_centicount_fixed_point_count x-parser-schema-id: open_interest_fp: type: string description: Fixed-point open interest (2 decimals) x-rust-type: i64 x-rust-serialize-with: ws::dto::serde_money::serialize_centicount_fixed_point_count x-parser-schema-id: dollar_volume: type: integer description: Signed whole-dollar cumulative traded notional x-parser-schema-id: dollar_open_interest: type: integer description: Signed whole-dollar open-interest notional x-parser-schema-id: yes_bid_size_fp: type: string description: Fixed-point contracts at best bid (2 decimals) x-rust-type: i64 x-rust-serialize-with: ws::dto::serde_money::serialize_centicount_fixed_point_count x-parser-schema-id: yes_ask_size_fp: type: string description: Fixed-point contracts at best ask (2 decimals) x-rust-type: i64 x-rust-serialize-with: ws::dto::serde_money::serialize_centicount_fixed_point_count x-parser-schema-id: last_trade_size_fp: type: string description: Fixed-point contracts in last trade (2 decimals) x-rust-type: common::types::Amount x-rust-serialize-with: ws::dto::serde_money::serialize_amount_fixed_point_count x-parser-schema-id: ts: type: integer deprecated: true description: >- Deprecated - Unix timestamp for when the update happened (in seconds). Use ts_ms instead. format: int64 x-parser-schema-id: ts_ms: type: integer description: >- Unix timestamp for when the update happened (in milliseconds) format: int64 x-parser-schema-id: time: type: string deprecated: true description: >- Deprecated - Timestamp for when the update happened (RFC3339, truncated to milliseconds). Use ts_ms instead. format: date-time x-parser-schema-id: x-parser-schema-id: sending_ts_ms: type: integer format: int64 description: >- Unix timestamp in milliseconds when Kalshi queued this message at the network layer. x-parser-schema-id: sendingTimestampMs x-parser-schema-id: tickerPayload title: Ticker Update description: Market price ticker information example: |- { "type": "ticker", "sending_ts_ms": 1669149841123, "sid": 11, "msg": { "market_id": "9b0f6b43-5b68-4f9f-9f02-9a2d1b8ac1a1", "market_ticker": "FED-23DEC-T3.00", "price_dollars": "0.4800", "yes_bid_dollars": "0.4500", "yes_ask_dollars": "0.5300", "volume_fp": "33896.00", "open_interest_fp": "20422.00", "dollar_volume": 16948, "dollar_open_interest": 10211, "yes_bid_size_fp": "300.00", "yes_ask_size_fp": "150.00", "last_trade_size_fp": "25.00", "ts": 1669149841, "ts_ms": 1669149841000, "time": "2022-11-22T20:44:01Z" } } bindings: [] extensions: - id: x-parser-unique-object-id value: ticker bindings: [] extensions: - id: x-parser-unique-object-id value: ticker sendOperations: [] receiveOperations: - *ref_1 sendMessages: [] receiveMessages: - *ref_2 extensions: - id: x-parser-unique-object-id value: ticker securitySchemes: - id: apiKey name: apiKey type: apiKey description: | API key authentication required for WebSocket connections. The API key should be provided during the WebSocket handshake. in: user extensions: [] ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.