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getSlotLeaders

Returns the slot leaders for a given slot range. Each entry in the returned array corresponds to the validator identity scheduled to be the leader for that slot. This method is useful for predicting upcoming leaders, optimizing transaction submission timing, and building leader schedule visualizations. The range is limited to a maximum of 5,000 slots.

Parameters

#TypeRequiredDescription
1u64YesStart slot
2u64YesNumber of slots to return leaders for (1-5000)

Response

Returns an array:

FieldTypeDescription
resultarray[string]Array of base-58 encoded validator identity public keys, one per slot

Code Examples

cURL

Terminal
curl http://88.216.36.108:7999 -X POST -H "Content-Type: application/json" -d '{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "getSlotLeaders",
  "params": [
    166974442, 10
  ]
}'

TypeScript

TypeScript
const response = await fetch("http://88.216.36.108:7999", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    jsonrpc: "2.0",
    id: 1,
    method: "getSlotLeaders",
    params: [
      166974442, 10
    ]
  }),
});
const { result } = await response.json();
console.log("Leaders:", result.length, "slots");

Python

Python
import requests

response = requests.post("http://88.216.36.108:7999", json={
    "jsonrpc": "2.0",
    "id": 1,
    "method": "getSlotLeaders",
    "params": [
        166974442, 10
    ]
})
result = response.json()["result"]
print(f"Leaders: {len(result)} slots")

Rust

Rust
use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    let res = client.post("http://88.216.36.108:7999")
        .json(&json!({
            "jsonrpc": "2.0",
            "id": 1,
            "method": "getSlotLeaders",
            "params": [
                166974442_u64, 10_u64
            ]
        }))
        .send().await?
        .text().await?;
    println!("{}", res);
    Ok(())
}

Example Response

JSON
{
  "jsonrpc": "2.0",
  "result": [
    "ChorusmmC7UypFMn6WKLH2jxEpPhRFY7XhrmYYMRxuPA",
    "ChorusmmC7UypFMn6WKLH2jxEpPhRFY7XhrmYYMRxuPA",
    "ChorusmmC7UypFMn6WKLH2jxEpPhRFY7XhrmYYMRxuPA",
    "Certusm1sa411sMpV9FPqU5dXAYhmmhygvxJ23S6hJ24",
    "Certusm1sa411sMpV9FPqU5dXAYhmmhygvxJ23S6hJ24"
  ],
  "id": 1
}