getMaxShredInsertSlot - Solana

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

This method returns the highest slot for which the node has written shreds into its blockstore. It advances after the retransmit stage completes for a slot.

Parameters

This method does not accept any parameters.

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": "getMaxShredInsertSlot",
    "params": [],
    "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>/', 'confirmed');

const { result } = await connection._rpcRequest('getMaxShredInsertSlot', []);

console.log(result);

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': 'getMaxShredInsertSlot',
        'params': [],
        '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": "getMaxShredInsertSlot",
            "params": [],
            "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 with shreds inserted into the node's blockstore

Use Cases

• Write Path Health: Detect blockstore write stalls separately from network ingestion

• Disk Diagnostics: Correlate insert lag with storage throughput problems

• Indexer Readiness: Confirm a slot is durably stored before requesting getBlock

• Node Comparison: Benchmark ingestion pipelines across hardware configurations

Error Handling

Error Code	Message	Description
-32603	Internal error	Node failed to read the requested cluster state
-32005	Node is unhealthy	The node has fallen behind the cluster tip