getmempoolinfo - Zcash

Example code for the getmempoolinfo JSON-RPC method. Сomplete guide on how to use the getmempoolinfo JSON-RPC method in GetBlock.io Web3 documentation.

This method returns aggregate mempool statistics: transaction count, memory usage, and minimum fee thresholds. Introduced in Zebra 3.0.0 (January 2026) to match the Bitcoin Core interface and enable Kubernetes-friendly health monitoring of mempool state.

Parameters

This method takes no parameters.

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "getmempoolinfo",
    "params": [],
    "id": "getblock.io"
}'

Axios

example.js

const axios = require('axios');

const response = await axios.post('https://go.getblock.io/<ACCESS-TOKEN>/', {
    jsonrpc: '2.0',
    method: 'getmempoolinfo',
    params: [],
    id: 'getblock.io'
}, {
    headers: { 'Content-Type': 'application/json' }
});

console.log(response.data.result);

Request

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers={'Content-Type': 'application/json'},
    json={
        'jsonrpc': '2.0',
        'method': 'getmempoolinfo',
        'params': [],
        'id': 'getblock.io'
    }
)

print(response.json())

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://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "getmempoolinfo",
            "params": [],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;
    
    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": {
        "size": 0,
        "bytes": 0,
        "usage": 0
    }
}

Response Parameters

Parameter	Type	Description
size	integer	Number of transactions in the mempool
bytes	integer	Total serialized size of mempool transactions in bytes
usage	integer	Total memory usage of the mempool in bytes
maxmempool	integer	Maximum configured mempool size in bytes
mempoolminfee	number	Current dynamic mempool minimum fee in ZEC/kB
minrelaytxfee	number	Configured minimum relay fee in ZEC/kB

Use Cases

• Mempool Health Monitoring: Alert when size or bytes approach configured limits

• Fee Estimation Baselines: Use mempoolminfee as a floor for constructing new transactions during congestion

• Capacity Planning: Track mempool memory usage on self-hosted nodes for resource sizing

• Congestion Signals: Compare bytes to maxmempool to detect capacity pressure

Error Handling

Error Code	Message	Description
-32603	Internal error	Node failed to compile the mempool stats