getrawmempool - Zcash

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

This method returns all transaction IDs currently in the node's mempool. Verbose mode returns full transaction metadata (fees, size, times) instead of just IDs. Post-Zebra 3.0.0, the mempool index bug that caused unnecessary per-transaction rebuilds during getrawmempool calls has been fixed, meaningfully improving performance under load.

Parameters

Parameter	Type	Required	Description
verbose	boolean	No	If true, return full metadata per transaction; if false, return only IDs. Default false

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "getrawmempool",
    "params": [
        false
    ],
    "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: 'getrawmempool',
    params: [
        false
    ],
    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': 'getrawmempool',
        'params': [
        false
    ],
        '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": "getrawmempool",
            "params": [
        false
    ],
            "id": "getblock.io"
        }))
        .send()
        .await?
        .json::<Value>()
        .await?;
    
    println!("Result: {}", response["result"]);
    Ok(())
}

Response

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": [
        "9c8f0e4f8d2e7c6b5a4f3e2d1c0b9a8e7f6d5c4b3a2b1c9d8e7f6a5b4c3d2e1f",
        "1cd7d1e5a67c7e4f1bb2d4c50a9c27c3b4a7f9e6b7a4919c2d5b0a6f3d9e1c4b"
    ]
}

Response Parameters

Parameter	Type	Description
result	array of string or object	Transaction IDs (verbose=false) or transaction detail objects (verbose=true) currently in the mempool

Use Cases

• Mempool Monitoring: Track transactions waiting for inclusion — feed data into MEV or activity dashboards

• Post-Submit Tracking: After sendrawtransaction, poll the mempool to confirm the transaction is queued

• Congestion Detection: Mempool size and composition indicate network congestion levels

• Fee Estimation Input: Analyze mempool fee distribution to estimate appropriate fees for new transactions

Error Handling

Error Code	Message	Description
-32603	Internal error	Node failed to read mempool state