> ## Documentation Index > Fetch the complete documentation index at: https://docs.cdp.coinbase.com/llms.txt > Use this file to discover all available pages before exploring further. # perpetual.(instrument_name).(interval) > Provide current interest rate - but only for **perpetual** instruments. Other types won't generate any notification. ## AsyncAPI ````yaml api-reference/coinbase-deribit-app-api/adv-starbase-asyncapi.json perpetual.(instrument_name).(interval) id: perpetual.(instrument_name).(interval) title: 'perpetual.(instrument_name).(interval) ' description: >- Provide current interest rate - but only for **perpetual** instruments. Other types won't generate any notification. servers: - id: public protocol: wss host: streams.drb.coinbase.com/ws/api/v2 bindings: [] variables: [] address: perpetual.{instrument_name}.{interval} parameters: - id: instrument_name jsonSchema: type: string description: The name of the instrument description: The name of the instrument type: string required: true deprecated: false - id: interval jsonSchema: type: string description: >- Frequency of notifications. Events will be aggregated over this interval. The value `raw` selects the finest granularity - events are aggregated over a 1 millisecond interval **(Please note that `raw` interval is only available to authorized users)** **Allowed values:** `raw`, `100ms`, `agg2` enum: - 100ms - agg2 - raw description: >- Frequency of notifications. Events will be aggregated over this interval. The value `raw` selects the finest granularity - events are aggregated over a 1 millisecond interval **(Please note that `raw` interval is only available to authorized users)** **Allowed values:** `raw`, `100ms`, `agg2` type: string required: true deprecated: false bindings: [] operations: - &ref_1 id: receive_perpetual_instrument_name_interval_updates title: Receive perpetual updates description: Client receives perpetual update notifications type: receive messages: - &ref_3 id: subscribe_request contentType: application/json payload: - name: Subscription Request description: >- Client sends subscription request to subscribe to notification channel. Please refer to [Notification page](https://deribit.mintlify.app/articles/notifications) for more information. type: object properties: - name: id type: integer description: Client request id, echoed in the response. required: true - name: jsonrpc type: string description: JSON-RPC version. Always `2.0`. required: true - name: method type: string description: '`public/subscribe` on the public WebSocket.' enumValues: - public/subscribe required: true - name: params type: object required: true properties: - name: channels type: array description: >- Stream names to subscribe to, for example `quote.BTC-PERPETUAL`. required: true properties: - name: item type: string required: false headers: [] jsonPayloadSchema: additionalProperties: false properties: id: default: 42 description: Client request id, echoed in the response. type: integer x-parser-schema-id: jsonrpc: default: '2.0' description: JSON-RPC version. Always `2.0`. type: string x-parser-schema-id: method: default: public/subscribe description: '`public/subscribe` on the public WebSocket.' enum: - public/subscribe type: string x-parser-schema-id: params: additionalProperties: false properties: channels: default: - perpetual.BTC-PERPETUAL.100ms description: >- Stream names to subscribe to, for example `quote.BTC-PERPETUAL`. items: type: string x-parser-schema-id: type: array x-parser-schema-id: required: - channels type: object x-parser-schema-id: required: - id - jsonrpc - method - params type: object x-parser-schema-id: title: Subscription Request description: >- Client sends subscription request to subscribe to notification channel. Please refer to [Notification page](https://deribit.mintlify.app/articles/notifications) for more information. example: |- { "id": 42, "jsonrpc": "2.0", "method": "public/subscribe", "params": { "channels": [ "perpetual.BTC-PERPETUAL.100ms" ] } } bindings: [] extensions: - id: x-parser-unique-object-id value: subscribe_request bindings: [] extensions: &ref_0 - id: x-parser-unique-object-id value: perpetual.(instrument_name).(interval) - &ref_2 id: send_subscribe_perpetual_instrument_name_interval title: Send subscribe request for perpetual description: Client sends subscription request for perpetual updates type: send messages: - &ref_4 id: subscription_message contentType: application/json payload: - name: Subscription Notification Data description: Server sends subscription notification data type: object properties: - name: data type: object required: true properties: - name: index_price type: number description: Current index price required: true - name: interest type: number description: Current interest required: true - name: timestamp type: integer description: The timestamp (milliseconds since the Unix epoch) required: true headers: [] jsonPayloadSchema: additionalProperties: false description: Response containing notification data properties: data: additionalProperties: false properties: index_price: description: Current index price example: 8247.27 type: number x-parser-schema-id: interest: description: Current interest type: number x-parser-schema-id: timestamp: description: The timestamp (milliseconds since the Unix epoch) example: 1536569522277 type: integer x-parser-schema-id: required: - index_price - interest - timestamp type: object x-parser-schema-id: required: - data type: object x-parser-schema-id: title: Subscription Notification Data description: Server sends subscription notification data example: |- { "data": { "index_price": 7872.88, "interest": 0.004999511380756577, "timestamp": 1571386349530 } } bindings: [] extensions: - id: x-parser-unique-object-id value: subscription_message bindings: [] extensions: *ref_0 sendOperations: - *ref_1 receiveOperations: - *ref_2 sendMessages: - *ref_3 receiveMessages: - *ref_4 extensions: - id: x-parser-unique-object-id value: perpetual.(instrument_name).(interval) securitySchemes: [] ````