> ## Documentation Index > Fetch the complete documentation index at: https://docs.solanatracker.io/llms.txt > Use this file to discover all available pages before exploring further. # Event volume > Live cumulative USD volume for an event (crypto 5m windows use the event slug). ## AsyncAPI ````yaml datastream/pm-volume.json eventVolume id: eventVolume title: Event volume description: >- Live cumulative USD volume for an event (crypto 5m windows use the event slug). servers: - id: production protocol: wss host: datastream.solanatracker.io bindings: [] variables: - id: apiKey description: Your unique API key from Data API subscription defaultValue: YOUR_DATASTREAM_KEY allowedValues: [] examples: [] address: / parameters: [] bindings: [] operations: - &ref_1 id: subscribeEventVolume title: Subscribe event volume description: Subscribe to cumulative event USD volume type: receive messages: - &ref_4 id: joinEventVolume payload: - name: joinEventVolume description: Subscribe to cumulative event USD volume type: object properties: - name: type type: string description: join required: true - name: room type: string description: 'Room pattern: `pm:event:{exchange}:{eventId}:volume`' required: true headers: [] jsonPayloadSchema: type: object required: - type - room properties: type: type: string const: join default: join x-parser-schema-id: room: type: string description: 'Room pattern: `pm:event:{exchange}:{eventId}:volume`' default: pm:event:polymarket:btc-updown-5m-1785347100:volume x-parser-schema-id: examples: - type: join room: pm:event:polymarket:btc-updown-5m-1785347100:volume x-parser-schema-id: title: Join event volume description: Subscribe to cumulative event USD volume example: |- { "type": "join", "room": "pm:event:polymarket:btc-updown-5m-1785347100:volume" } bindings: [] extensions: - id: x-parser-unique-object-id value: joinEventVolume - id: x-parser-message-name value: joinEventVolume bindings: [] extensions: &ref_0 - id: x-displayName value: Event Volume - id: x-parser-unique-object-id value: eventVolume - &ref_3 id: receiveEventVolumeMessage title: Receive event volume message description: Receive Event Volume updates type: send messages: - &ref_6 id: eventVolumeMessage payload: - name: eventVolumeMessage description: Event Volume update type: object properties: - name: type type: string description: message required: false - name: room type: string required: false - name: data type: object description: >- Flat room data. Envelope fields plus event-specific fields (trade/price/orderbook/…) at the top level. required: false properties: - name: type type: string description: >- Event kind (trade, price, orderbook_snapshot, quote, crypto_price, …) required: true - name: channel type: string enumValues: - prices - trades - orderbook - quotes - volume - market_lifecycle - resolution required: true - name: exchange type: string enumValues: - kalshi - polymarket required: true - name: marketId type: string required: true - name: eventId type: string required: false - name: seriesId type: string required: false - name: category type: string required: false - name: sport type: string required: false - name: sourceId type: string description: Exchange/source idempotency key (omit when empty) required: false - name: timestamp type: integer description: Unix epoch milliseconds required: true headers: [] jsonPayloadSchema: type: object properties: type: type: string const: message x-parser-schema-id: room: type: string x-parser-schema-id: data: type: object description: >- Flat room data. Envelope fields plus event-specific fields (trade/price/orderbook/…) at the top level. additionalProperties: true required: - type - channel - exchange - marketId - timestamp properties: type: type: string description: >- Event kind (trade, price, orderbook_snapshot, quote, crypto_price, …) x-parser-schema-id: channel: type: string enum: - prices - trades - orderbook - quotes - volume - market_lifecycle - resolution x-parser-schema-id: exchange: type: string enum: - kalshi - polymarket x-parser-schema-id: marketId: type: string x-parser-schema-id: eventId: type: string x-parser-schema-id: seriesId: type: string x-parser-schema-id: category: type: string x-parser-schema-id: sport: type: string x-parser-schema-id: sourceId: type: string description: Exchange/source idempotency key (omit when empty) x-parser-schema-id: timestamp: type: integer description: Unix epoch milliseconds x-parser-schema-id: x-parser-schema-id: RealtimeData examples: - type: message room: pm:event:polymarket:btc-updown-5m-1785347100:volume data: type: volume channel: volume exchange: polymarket marketId: '1234567890' timestamp: 1785347120123 eventId: btc-updown-5m-1785347100 volume: 48210.55 marketVolume: 24105.27 delta: 42.5 x-parser-schema-id: title: Event volume message description: Event Volume update example: |- { "type": "message", "room": "pm:event:polymarket:btc-updown-5m-1785347100:volume", "data": { "type": "volume", "channel": "volume", "exchange": "polymarket", "marketId": "1234567890", "timestamp": 1785347120123, "eventId": "btc-updown-5m-1785347100", "volume": 48210.55, "marketVolume": 24105.27, "delta": 42.5 } } bindings: [] extensions: - id: x-parser-unique-object-id value: eventVolumeMessage - id: x-parser-message-name value: eventVolumeMessage bindings: [] extensions: *ref_0 - &ref_2 id: unsubscribeEventVolume title: Unsubscribe event volume description: Unsubscribe from Event Volume type: receive messages: - &ref_5 id: leaveEventVolume payload: - name: leaveEventVolume description: Unsubscribe from Event Volume type: object properties: - name: type type: string description: leave required: true - name: room type: string required: true headers: [] jsonPayloadSchema: type: object required: - type - room properties: type: type: string const: leave default: leave x-parser-schema-id: room: type: string default: pm:event:polymarket:btc-updown-5m-1785347100:volume x-parser-schema-id: examples: - type: leave room: pm:event:polymarket:btc-updown-5m-1785347100:volume x-parser-schema-id: title: Leave event volume description: Unsubscribe from Event Volume example: |- { "type": "leave", "room": "pm:event:polymarket:btc-updown-5m-1785347100:volume" } bindings: [] extensions: - id: x-parser-unique-object-id value: leaveEventVolume - id: x-parser-message-name value: leaveEventVolume bindings: [] extensions: *ref_0 sendOperations: - *ref_1 - *ref_2 receiveOperations: - *ref_3 sendMessages: - *ref_4 - *ref_5 receiveMessages: - *ref_6 extensions: - id: x-displayName value: Event Volume - id: x-parser-unique-object-id value: eventVolume securitySchemes: - id: apiKeyAuth name: apiKey type: httpApiKey description: >- API key for authentication. Include your Datastream key in the connection URL: wss://datastream.solanatracker.io/{DATASTREAM_KEY} in: header extensions: [] ````