Tutorials

GET Transaction Output by Reference

16min

Prerequisites
Before submitting an API request, ensure you have completed the following:
Created an Account
Created a Project
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Steps to Submit an API Request 
The Blockchain Indexer﻿ API allows applications to retrieve on-chain data and submit transactions. 
In this example, we will use the Pre-Production Cardano network as the selected network for our project.
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1. Select the Network
Ensure your project is configured to use the Pre-Production Cardano network.
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2. Retrieve Transaction Output 
Use the following endpoint to get detailed information about a transaction and its output UTxO:
Text
/transactions/{tx_hash}/outputs/{index}/txo
/transactions/{tx_hash}/outputs/{index}/txo
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3. Specify Path Parameters
Include the required path parameters in your request:
Parameter
Data Type
Description
Required
tx_hash
String
The unique identifier of the transaction.
yes
index
Integer
The output index is specifying which UTxO to retrieve.
yes
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4. Specify Query Parameters (Optional)
Include optional query parameters as needed:
Parameter
Data Type
Description
Required
with_cbor
Boolean
Set to true to include the CBOR encoding of the transaction output in the response.
no
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5. Send the API Request
Use cURL or your preferred tool to send the API request:
For this example, we will use:
tx_hash: 9907c1bcab96889368d975ec1964e2fedfef22ce4a0e367bf9cb621b9f0dcb4a
index: 0
with_cbor: true
Bash
curl -X GET \
  -H "api-key: <your_project_api_key>" \
  -H 'Accept: application/json' \
 https://preprod.gomaestro-api.org/v1/transactions/9907c1bcab96889368d975ec1964e2fedfef22ce4a0e367bf9cb621b9f0dcb4a/outputs/0/txo?resolve_datums=true&with_cbor=true

curl -X GET \
  -H "api-key: <your_project_api_key>" \
  -H 'Accept: application/json' \
 https://preprod.gomaestro-api.org/v1/transactions/9907c1bcab96889368d975ec1964e2fedfef22ce4a0e367bf9cb621b9f0dcb4a/outputs/0/txo?resolve_datums=true&with_cbor=true
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6. Review the Response
The API will return a response like the following:
JSON
"data": {
    "tx_hash": "9907c1bcab96889368d975ec1964e2fedfef22ce4a0e367bf9cb621b9f0dcb4a",
    "index": 0,
    "assets": [
        {
            "unit": "lovelace",
            "amount": 7280082022
        },
        {
            "unit": "34250edd1e9836f5378702fbf9416b709bc140e04f668cc3552085184154414441636f696e",
            "amount": 10824
        }
    ],
    "address": "addr_test1vpfwv0ezc5g8a4mkku8hhy3y3vp92t7s3ul8g778g5yegsgalc6gc",
    "datum": null,
    "reference_script": null,
    "txout_cbor": "a200581d6052e63f22c5107ed776b70f7b92248b02552fd08f3e747bc74509944101821b00000001b1ed3c66a1581c34250edd1e9836f5378702fbf9416b709bc140e04f668cc355208518a1494154414441636f696e192a48"
},
"last_updated": {
    "timestamp": "2024-09-06 13:56:56",
    "block_hash": "ca6cf1b408ee8eb02019bce77995c5ed5983c2b553b1b6b2fcecfaaf72d1fc59",
    "block_slot": 69947816
}
"data": {
    "tx_hash": "9907c1bcab96889368d975ec1964e2fedfef22ce4a0e367bf9cb621b9f0dcb4a",
    "index": 0,
    "assets": [
        {
            "unit": "lovelace",
            "amount": 7280082022
        },
        {
            "unit": "34250edd1e9836f5378702fbf9416b709bc140e04f668cc3552085184154414441636f696e",
            "amount": 10824
        }
    ],
    "address": "addr_test1vpfwv0ezc5g8a4mkku8hhy3y3vp92t7s3ul8g778g5yegsgalc6gc",
    "datum": null,
    "reference_script": null,
    "txout_cbor": "a200581d6052e63f22c5107ed776b70f7b92248b02552fd08f3e747bc74509944101821b00000001b1ed3c66a1581c34250edd1e9836f5378702fbf9416b709bc140e04f668cc355208518a1494154414441636f696e192a48"
},
"last_updated": {
    "timestamp": "2024-09-06 13:56:56",
    "block_hash": "ca6cf1b408ee8eb02019bce77995c5ed5983c2b553b1b6b2fcecfaaf72d1fc59",
    "block_slot": 69947816
}
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7. Understanding the Response
Term
Definition
tx_hash
The unique hash identifier of a transaction.
index
The index position of the transaction output (UTxO).
assets unit
The reference for native assets, either hex(policy_id)#hex(asset_name) or lovelace.
assets quantity
The quantity of the native asset.
address
The address controlling the UTxO.
datum type
Type of datum: either inline or hash.
datum hash
The hash of the datum.
datum bytes
Hex-encoded CBOR bytes of the datum (null if datum type is hash and corresponding datum bytes have not been seen on-chain).
datum json
JSON format of the datum value.
reference_script type
The type of reference script: native, plutusv1, or plutusv2.
reference_script hash
The hash of the reference script.
reference_script bytes
The script bytes (null if the script is native).
reference_script json
JSON format of the script.
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Parameter	Data Type	Description	Required
tx_hash	String	The unique identifier of the transaction.	yes
index	Integer	The output index is specifying which UTxO to retrieve.	yes

Parameter	Data Type	Description	Required
with_cbor	Boolean	Set to true to include the CBOR encoding of the transaction output in the response.	no

tx_hash	The unique hash identifier of a transaction.
index	The index position of the transaction output (UTxO).
assets unit	The reference for native assets, either hex(policy_id)#hex(asset_name) or lovelace.
assets quantity	The quantity of the native asset.
address	The address controlling the UTxO.
datum type	Type of datum: either inline or hash.
datum hash	The hash of the datum.
datum bytes	Hex-encoded CBOR bytes of the datum (null if datum type is hash and corresponding datum bytes have not been seen on-chain).
datum json	JSON format of the datum value.
reference_script type	The type of reference script: native, plutusv1, or plutusv2.
reference_script hash	The hash of the reference script.
reference_script bytes	The script bytes (null if the script is native).
reference_script json	JSON format of the script.

Updated 22 Nov 2024

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