> ## 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. # Pyth Value Feed > Real-time Pyth price updates for configured underlying tickers ## AsyncAPI ````yaml asyncapi.yaml pyth_value id: pyth_value title: Pyth Value Feed description: > Real-time Pyth price updates for configured underlying tickers. Requires authentication. **Requirements:** - Authentication required - Seed `underlying_tickers` in the initial subscribe, or add them later - Use `underlying_tickers: ["all"]` to receive every available underlying - Supports `update_subscription` with `subscribe_underlyings`, `unsubscribe_underlyings`, and `underlying_list` actions - Duplicate and out-of-order source timestamps are ignored independently per underlying ticker Subscribe without `underlying_tickers` to create an empty subscription, then use `underlying_list` to discover recently streamed underlyings and `subscribe_underlyings` to receive prices. servers: - id: production protocol: wss host: external-api-ws.kalshi.com bindings: [] variables: [] address: pyth_value parameters: [] bindings: [] operations: - &ref_3 id: receivePythValue title: Pyth Value Update description: Receive deduplicated real-time Pyth prices type: send messages: - &ref_5 id: pythValue contentType: application/json payload: - name: Pyth Value Update description: Deduplicated real-time Pyth price for an underlying ticker type: object properties: - name: type type: string description: pyth_value required: true - name: sid type: integer description: >- Server-generated subscription identifier (sid) used to identify the channel required: true - name: seq type: integer description: >- Sequential number that should be checked if you want to guarantee you received all the messages. Used for snapshot/delta consistency required: true - name: msg type: object required: true properties: - name: underlying_ticker type: string description: Qualified Pyth underlying ticker required: true - name: value_usd type: string description: USD value formatted to 8 decimal places required: true - name: source_ts_ms type: integer description: Pyth source timestamp (unix ms) required: true - name: received_at type: integer description: When Kalshi received the Pyth update (unix ms) required: true headers: [] jsonPayloadSchema: type: object required: - type - sid - seq - msg properties: type: type: string const: pyth_value x-parser-schema-id: sid: &ref_0 type: integer description: >- Server-generated subscription identifier (sid) used to identify the channel minimum: 1 x-parser-schema-id: subscriptionId seq: &ref_1 type: integer description: >- Sequential number that should be checked if you want to guarantee you received all the messages. Used for snapshot/delta consistency minimum: 1 x-parser-schema-id: sequenceNumber msg: type: object required: - underlying_ticker - value_usd - source_ts_ms - received_at properties: underlying_ticker: type: string description: Qualified Pyth underlying ticker x-parser-schema-id: value_usd: type: string description: USD value formatted to 8 decimal places x-parser-schema-id: source_ts_ms: type: integer description: Pyth source timestamp (unix ms) x-parser-schema-id: received_at: type: integer description: When Kalshi received the Pyth update (unix ms) x-parser-schema-id: x-parser-schema-id: x-parser-schema-id: pythValuePayload title: Pyth Value Update description: Deduplicated real-time Pyth price for an underlying ticker example: |- { "type": "pyth_value", "sid": 1, "seq": 42, "msg": { "underlying_ticker": "Metal.XAU/USD", "value_usd": "2365.12345000", "source_ts_ms": 1710000000100, "received_at": 1710000000123 } } bindings: [] extensions: - id: x-parser-unique-object-id value: pythValue bindings: [] extensions: &ref_2 - id: x-parser-unique-object-id value: pyth_value - &ref_4 id: receivePythUnderlyingList title: Pyth Underlying List description: Receive recently streamed Pyth underlying tickers type: send messages: - &ref_6 id: pythUnderlyingList contentType: application/json payload: - name: Pyth Underlying List description: Recently streamed Pyth underlying tickers type: object properties: - name: type type: string description: pyth_value_underlying_list required: true - name: id type: integer description: > Unique ID of the command request. Generated by the client and should be unique within a WS session. The simplest way to use it would be to start from 1 and then increment the value for every new command sent to the server. If the id is set to 0, the server treats it the same way as if there was no id. required: false - name: sid type: integer description: >- Server-generated subscription identifier (sid) used to identify the channel required: true - name: seq type: integer description: >- Sequential number that should be checked if you want to guarantee you received all the messages. Used for snapshot/delta consistency required: true - name: msg type: object required: true properties: - name: underlying_tickers type: array description: >- Underlying tickers observed on the Pyth stream in the last two hours required: true properties: - name: item type: string required: false headers: [] jsonPayloadSchema: type: object required: - type - sid - seq - msg properties: type: type: string const: pyth_value_underlying_list x-parser-schema-id: id: type: integer description: > Unique ID of the command request. Generated by the client and should be unique within a WS session. The simplest way to use it would be to start from 1 and then increment the value for every new command sent to the server. If the id is set to 0, the server treats it the same way as if there was no id. minimum: 0 x-parser-schema-id: commandId sid: *ref_0 seq: *ref_1 msg: type: object required: - underlying_tickers properties: underlying_tickers: type: array description: >- Underlying tickers observed on the Pyth stream in the last two hours items: type: string x-parser-schema-id: x-parser-schema-id: x-parser-schema-id: x-parser-schema-id: pythUnderlyingListPayload title: Pyth Underlying List description: Recently streamed Pyth underlying tickers example: |- { "type": "pyth_value_underlying_list", "id": 2, "sid": 1, "seq": 1, "msg": { "underlying_tickers": [ "Metal.XAG/USD", "Metal.XAU/USD" ] } } bindings: [] extensions: - id: x-parser-unique-object-id value: pythUnderlyingList bindings: [] extensions: *ref_2 sendOperations: [] receiveOperations: - *ref_3 - *ref_4 sendMessages: [] receiveMessages: - *ref_5 - *ref_6 extensions: - id: x-parser-unique-object-id value: pyth_value 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: [] ````