mempool/transaction - Cardano

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

This endpoint returns a single unconfirmed transaction from the mempool, expressed in the Rosetta operation model.

Parameters

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

Field	Type	Required	Description
network_identifier	object	Yes	The network to query
transaction_identifier	object	Yes	The mempool transaction hash to fetch

Request

cURL

curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/mempool/transaction' \
--header 'Content-Type: application/json' \
--data-raw '{
    "network_identifier": {
        "blockchain": "cardano",
        "network": "mainnet"
    },
    "transaction_identifier": {
        "hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"
    }
}'

JavaScript

example.js

const response = await fetch(
    'https://go.getblock.io/<ACCESS-TOKEN>/mempool/transaction',
    {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "transaction_identifier": {"hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"}})
    }
);
console.log(await response.json());

Python

example.py

import requests

response = requests.post(
    'https://go.getblock.io/<ACCESS-TOKEN>/mempool/transaction',
    headers={'Content-Type': 'application/json'},
    json={"network_identifier": {"blockchain": "cardano", "network": "mainnet"}, "transaction_identifier": {"hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"}}
)

print(response.json())

Response

{
    "transaction": {
        "transaction_identifier": {
            "hash": "10b54fd708ab2e5703979b4ba27ca0339882abc2062e77fbe51e625203a49642"
        },
        "operations": [
            {
                "operation_identifier": {
                    "index": 0
                },
                "type": "output",
                "status": "success",
                "account": {
                    "address": "addr1qxy2lpan99fcnhhyzr8w8qk4dqz4mp7g6b8h3r2v5c9d0e1f2g3h4j5k6l7m8n9p0q"
                },
                "amount": {
                    "value": "9407625",
                    "currency": {
                        "symbol": "ADA",
                        "decimals": 6
                    }
                }
            }
        ]
    }
}

Response Parameters

Field	Type	Description
transaction.transaction_identifier	object	The transaction hash
transaction.operations	array	The pending transaction's operations

Use Cases

• Pending Detail: Inspect an unconfirmed transaction's operations

• Payment Preview: Show incoming amounts before confirmation

• Fee Analysis: Read a pending transaction's operations for fees

• Monitoring: Track a specific pending transaction

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