getMaxRetransmitSlot - Solana

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

This method returns the highest slot the node has observed through the retransmit stage of the turbine block propagation protocol.

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": "getMaxRetransmitSlot",
    "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('getMaxRetransmitSlot', []);

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': 'getMaxRetransmitSlot',
        '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": "getMaxRetransmitSlot",
            "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 seen by the node's retransmit stage

Use Cases

• Propagation Lag: Compare against getSlot to measure shred propagation delay

• Node Diagnostics: Detect turbine ingestion problems on a dedicated node

• Peering Checks: Confirm a node is receiving shreds from its upstream peers

• Latency Benchmarks: Compare retransmit progress across regional endpoints

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