getmempoolancestors - Litecoin

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

If the txid is in the mempool, this returns all in-mempool ancestors.

Parameters

Parameter	Type	Description
txid	string	The transaction id (must be in mempool).
verbose	boolean	Optional. True for JSON object. Default=false.

Request examples

cURL

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": "getmempoolancestors",
    "params": ["txid123...", false],
    "id": "getblock.io"
}'

Axios (JavaScript)

axios.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "getmempoolancestors",
    "params": ["txid123...", false],
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data)))
    .catch(error => console.log(error));

Python (requests)

request.py

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "getmempoolancestors",
    "params": ["txid123...", false],
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (reqwest)

main.rs

use reqwest::header;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = reqwest::Client::new();
    
    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header(header::CONTENT_TYPE, "application/json")
        .body(r#"{
            "jsonrpc": "2.0",
            "method": "getmempoolancestors",
            "params": ["txid123...", false],
            "id": "getblock.io"
        }"#)
        .send()
        .await?;
    
    println!("{}", response.text().await?);
    Ok(())
}

Response

response.json

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": ["ancestor_txid1", "ancestor_txid2"]
}

Response Parameters

Field	Type	Description
result	array	Array of ancestor transaction IDs.

Use Case

The getmempoolancestors method is essential for:

• Dependency tracking

• CPFP analysis

• Transaction chains

• Fee bumping

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid ACCESS-TOKEN.

Integration Notes

The getmempoolancestors method helps developers build robust applications that interact with the Litecoin blockchain.