> For the complete documentation index, see [llms.txt](https://docs.solanavibestation.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.solanavibestation.com/api-reference/solana-rpc/websocket-methods/slotsubscribe.md).

# slotSubscribe

## slotSubscribe — Subscribe to slot updates

> Subscribe to receive notification anytime a slot is processed by the validator. This method establishes a persistent WebSocket connection that will send real-time notifications whenever the validator processes a new slot. Each notification includes information about the current slot, its parent slot, and the current root slot. This subscription provides high-frequency updates about blockchain progression and is useful for monitoring network activity, tracking slot timing, and understanding the relationship between processed slots and finalized roots.

```json
{"openapi":"3.0.3","info":{"title":"WebSocket RPC: slotSubscribe","version":"1.0.0"},"tags":[{"name":"Slot Subscriptions","description":"WebSocket RPC slot subscriptions method."}],"servers":[{"url":"wss://public.rpc.solanavibestation.com","description":"Public WebSocket endpoint (rate-limited)"},{"url":"wss://lite.rpc.solanavibestation.com","description":"Lite tier WebSocket"},{"url":"wss://basic.rpc.solanavibestation.com","description":"Basic tier WebSocket"},{"url":"wss://ultra.rpc.solanavibestation.com","description":"Ultra tier WebSocket"},{"url":"wss://elite.rpc.solanavibestation.com","description":"Elite tier WebSocket"},{"url":"wss://epic.rpc.solanavibestation.com","description":"Epic tier WebSocket"}],"security":[{},{"AuthHeader":[]},{"URLParameter":[]}],"components":{"securitySchemes":{"AuthHeader":{"type":"apiKey","in":"header","name":"Authorization","description":"Pass `Authorization: <api-key>` on each request."},"URLParameter":{"type":"apiKey","in":"query","name":"api_key","description":"Pass `?api_key=<api-key>` on the URL."}},"schemas":{"JsonRpcEnvelope":{"type":"object","required":["jsonrpc","id"],"description":"Base envelope of every JSON-RPC 2.0 response.","properties":{"jsonrpc":{"type":"string","enum":["2.0"]},"id":{"oneOf":[{"type":"string"},{"type":"integer"}],"description":"Echoed request id."}}},"JsonRpcErrorResponse":{"type":"object","required":["jsonrpc","id","error"],"description":"JSON-RPC 2.0 error response.","properties":{"jsonrpc":{"type":"string","enum":["2.0"]},"id":{"oneOf":[{"type":"string"},{"type":"integer"}]},"error":{"$ref":"#/components/schemas/JsonRpcError"}}},"JsonRpcError":{"type":"object","required":["code","message"],"description":"Structured JSON-RPC error.","properties":{"code":{"type":"integer","description":"Numeric error code per JSON-RPC 2.0 spec. Common values:\n- `-32700` Parse error\n- `-32600` Invalid Request\n- `-32601` Method not found\n- `-32602` Invalid params\n- `-32603` Internal error\n- `-32003` Unauthorized\n- `-32005` Too Many Requests\n- `-32015` Transaction version not supported\n"},"message":{"type":"string"},"data":{"type":"object","additionalProperties":true}}}},"responses":{"UnauthorizedError":{"description":"Authentication required or invalid.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/JsonRpcErrorResponse"}}}},"ForbiddenError":{"description":"Insufficient permissions for the request.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/JsonRpcErrorResponse"}}}},"TooManyRequestsError":{"description":"Rate limit exceeded for this tier.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/JsonRpcErrorResponse"}}}},"InternalServerError":{"description":"Unexpected server error.","content":{"application/json":{"schema":{"$ref":"#/components/schemas/JsonRpcErrorResponse"}}}}}},"paths":{"/":{"post":{"operationId":"slotSubscribe","summary":"slotSubscribe — Subscribe to slot updates","tags":["Slot Subscriptions"],"description":"Subscribe to receive notification anytime a slot is processed by the validator. This method establishes a persistent WebSocket connection that will send real-time notifications whenever the validator processes a new slot. Each notification includes information about the current slot, its parent slot, and the current root slot. This subscription provides high-frequency updates about blockchain progression and is useful for monitoring network activity, tracking slot timing, and understanding the relationship between processed slots and finalized roots.","requestBody":{"required":true,"content":{"application/json":{"schema":{"type":"object","required":["jsonrpc","id","method","params"],"properties":{"jsonrpc":{"type":"string","enum":["2.0"],"description":"JSON-RPC protocol version."},"id":{"oneOf":[{"type":"string"},{"type":"integer"}],"description":"Request identifier echoed back in the response."},"method":{"type":"string","enum":["slotSubscribe"],"description":"Must be `slotSubscribe`."},"params":{"type":"array","description":"No parameters.","maxItems":0}}}}}},"responses":{"200":{"description":"Successful `slotSubscribe` response.","content":{"application/json":{"schema":{"allOf":[{"$ref":"#/components/schemas/JsonRpcEnvelope"},{"type":"object","required":["result"],"properties":{"result":{"type":"integer","format":"int64","description":"Subscription id. Save this value to call the matching unsubscribe method later."}}}]}}}},"401":{"$ref":"#/components/responses/UnauthorizedError"},"403":{"$ref":"#/components/responses/ForbiddenError"},"429":{"$ref":"#/components/responses/TooManyRequestsError"},"500":{"$ref":"#/components/responses/InternalServerError"}}}}}}
```