getSlot - Solana

Example code for the getSlot JSON-RPC method. Complete guide on how to use the getSlot JSON-RPC method in the GetBlock Web3 documentation.

This method returns the highest slot the node has reached at the requested commitment level. Slots increment on a fixed schedule whether or not a block is produced.

Parameters

Parameter	Type	Required	Description
config	object	No	Configuration object controlling commitment

Config Object

Field	Type	Required	Description
commitment	string	No	Commitment level: processed, confirmed, or finalized. Defaults to finalized
minContextSlot	number	No	Minimum slot the request can be evaluated at

Request

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "getSlot",
    "params": [{"commitment": "finalized"}],
    "id": "getblock.io"
}'

@solana/web3.js

example.js

const { Connection } = require('@solana/web3.js');

const connection = new Connection('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/', 'finalized');

const slot = await connection.getSlot();

console.log(slot);

Request

example.py

import requests

response = requests.post(
    'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'getSlot',
        'params': [{"commitment": "finalized"}],
        'id': 'getblock.io'
    }
)

print(response.json()['result'])

Rust

example.rs

use reqwest::Client;
use serde_json::{json, Value};

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "getSlot",
            "params": [{"commitment": "finalized"}],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;

    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": 397234561
}

Response Parameters

Parameter	Type	Description
jsonrpc	string	JSON-RPC protocol version ("2.0")
id	string	Request identifier matching the request
result	number	Highest slot reached at the requested commitment

Use Cases

• Sync Checks: Compare slots across providers to detect a lagging endpoint

• Polling Anchors: Use the current slot as a cursor for incremental ingestion

• Commitment Gaps: Measure the distance between processed and finalized slots

• Timing Estimates: Convert slot deltas to elapsed time at roughly 400 ms per slot

Error Handling

Error Code	Message	Description
-32602	Invalid params	Unrecognized commitment level in the config object
-32016	Minimum context slot has not been reached	The node has not yet processed minContextSlot
-32603	Internal error	Node failed to read the requested cluster state
-32005	Node is unhealthy	The node has fallen behind the cluster tip