mempool - Cardano

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

This endpoint returns the transaction identifiers currently in the node's mempool.

Parameters

The request body is a JSON object with the following fields.

Field	Type	Required	Description
network_identifier	object	Yes	The network to query
metadata	object	No	Optional metadata object

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/mempool' \
--header 'Content-Type: application/json' \
--data-raw '{
    "network_identifier": {
        "blockchain": "cardano",
        "network": "mainnet"
    },
    "metadata": {}
}'

JavaScript

example.js

const response = await fetch(
    'https://go.getblock.io/<ACCESS-TOKEN>/mempool',
    {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "metadata": {}})
    }
);
console.log(await response.json());

Python

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/mempool',
    headers={'Content-Type': 'application/json'},
    json={"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "metadata": {}}
)

print(response.json())

Response

{
    "transaction_identifiers": [
        {
            "hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"
        }
    ]
}

Response Parameters

Field	Type	Description
transaction_identifiers	array	Hashes of transactions currently in the mempool

Use Cases

• Pending Monitoring: List unconfirmed transactions

• Payment Detection: Detect an incoming transaction before confirmation

• Congestion Signals: Gauge mempool depth

• Status Tracking: Confirm a submitted transaction is pending

Error Handling

Error Code	Message	Description
1	Invalid request	The request body is malformed or missing required fields
4	Block not found	The requested block does not exist on this node
5	Internal error	The node failed to answer the request