Query Cardano UTxOs

16min

Get UTxO details on Cardano
In this guide, you will learn to query Cardano and extract UTxO information by leveraging the UTxOs at an Address endpoint.
Prerequisites
Before submitting an API request, ensure you have completed the following:
﻿Create an Account﻿ 
﻿Create a Project﻿ 
Project Name: <Your Project Name>
Blockchain: Cardano
Network: Preprod
﻿
Steps to Submit an API Request 
The API allows applications to retrieve detailed information on UTxOs controlled by a specific address.
In this example, we will use the Cardano Preprod as the selected network for our project.
﻿
1. Select the Network
Ensure your project is configured to use Cardano Preprod.
﻿
2. Retrieve Transaction Output 
Use the following endpoint to get a list of all UTxOs that reside at the specified Cardano address or script pubkey:
/addresses/:address/utxos
﻿
3. Specify Path Parameters
Include the required path parameters in your request:
Parameter
Data Type
Description
Required
address
String
The address in Bech32 format to query UTxOs.
yes
﻿
4. Specify Query Parameters (Optional)
Include optional query parameters as needed:
Parameter
Data Type
Description
Required
asset
String
Returns only UTxOs containing a specific asset (formatted as concatenation of hex-encoded policy and asset name).
no
resolve_datums
Boolean
If true, include corresponding datums for datum hashes in the response.
no
with_cbor
Boolean
If true, includes CBOR encodings of transaction outputs in the response.
no
count
Integer
Maximum number of results to return per page.
no
order
String
Sort order for results (asc for ascending or desc for descending).
no
from
int64
Returns only UTxOs created on or after a specific slot number.
no
to
int64
Returns only UTxOs created on or before a specific slot number.
no
cursor
String
Pagination cursor string to fetch the next page of results.
﻿
﻿
5. Send the API Request
Use cURL or your preferred tool to send the API request:
For this example, we will use:
address: addr_test1wzdtu0djc76qyqak9cj239udezj2544nyk3ksmfqvaksv7c9xanpg
order: asc
Curl
curl -L -X GET \
-H "Accept: application/json" \
-H "api-key: <API_KEY_VALUE>" \
'https://preprod.gomaestro-api.org/v1/addresses/addr_test1wzdtu0djc76qyqak9cj239udezj2544nyk3ksmfqvaksv7c9xanpg/utxos?order=asc'
curl -L -X GET \
-H "Accept: application/json" \
-H "api-key: <API_KEY_VALUE>" \
'https://preprod.gomaestro-api.org/v1/addresses/addr_test1wzdtu0djc76qyqak9cj239udezj2544nyk3ksmfqvaksv7c9xanpg/utxos?order=asc'
﻿
﻿
6. Review the Response
The API will return a response like the following:
JSON
{
    "data": [
        {
            "tx_hash": "6c1bbfff3b22f189b325fee3f51eceacf13090aae895e912c56ec615efacb3e0",
            "index": 0,
            "slot": 57115432,
            "assets": [
                {
                    "unit": "lovelace",
                    "amount": 1224040
                },
                {
                    "unit": "0c64d6d0371d11185aae649cf3a169040e94214137137b531ebb16c2446a65644f7261636c654e4654",
                    "amount": 1
                }
            ],
            "address": "addr_test1wzdtu0djc76qyqak9cj239udezj2544nyk3ksmfqvaksv7c9xanpg",
            "datum": {
                "type": "hash",
                "hash": "065191b95752a6ecca365cfd19a68f8968215596fbfc94f1fbc8ab0053d9110f",
                "bytes": null,
                "json": null
            },
            "reference_script": null,
            "txout_cbor": null
        }
    ],
    "last_updated": {
        "timestamp": "2024-09-11 23:22:19",
        "block_hash": "053a9d8a812db204a32ddbb90834128ec8f94a3de2c990caa413dd55ae30d5c1",
        "block_slot": 70413739
    },
    "next_cursor": null
}
{
    "data": [
        {
            "tx_hash": "6c1bbfff3b22f189b325fee3f51eceacf13090aae895e912c56ec615efacb3e0",
            "index": 0,
            "slot": 57115432,
            "assets": [
                {
                    "unit": "lovelace",
                    "amount": 1224040
                },
                {
                    "unit": "0c64d6d0371d11185aae649cf3a169040e94214137137b531ebb16c2446a65644f7261636c654e4654",
                    "amount": 1
                }
            ],
            "address": "addr_test1wzdtu0djc76qyqak9cj239udezj2544nyk3ksmfqvaksv7c9xanpg",
            "datum": {
                "type": "hash",
                "hash": "065191b95752a6ecca365cfd19a68f8968215596fbfc94f1fbc8ab0053d9110f",
                "bytes": null,
                "json": null
            },
            "reference_script": null,
            "txout_cbor": null
        }
    ],
    "last_updated": {
        "timestamp": "2024-09-11 23:22:19",
        "block_hash": "053a9d8a812db204a32ddbb90834128ec8f94a3de2c990caa413dd55ae30d5c1",
        "block_slot": 70413739
    },
    "next_cursor": null
}
﻿
﻿
7. Understanding the Response
Term
Definition
tx_hash
The unique identifier of the transaction that created this UTXO.
index
The output index of this UTXO within the transaction.
slot
The slot number at which this UTXO was created.
assets
A list of assets contained in this UTXO, including their unit (type) and amount.
address
The address associated with this UTXO.
datum.type
The type of datum associated with this UTXO (e.g., "hash").
datum.hash
The hash of the datum associated with this UTXO.
datum.bytes
The byte representation of the datum (if available), otherwise null.
datum.json
The JSON representation of the datum (if available), otherwise null.
reference_script
A reference to a script associated with this UTXO, if any, otherwise null.
txout_cbor
The CBOR encoding of the transaction output, if available, otherwise null.
last_updated.timestamp
The timestamp indicating when the data was last updated.
last_updated.block_hash
The hash of the block where the UTXO data was last updated.
last_updated.block_slot
The slot number of the block where the UTXO data was last updated.
next_cursor
A pointer to the next set of data if there are more results; otherwise null.
Next Steps
Congrats! Now that you've made your API request, let's Submit Your First Transaction﻿.
﻿

Parameter	Data Type	Description	Required
address	String	The address in Bech32 format to query UTxOs.	yes

Parameter	Data Type	Description	Required
asset	String	Returns only UTxOs containing a specific asset (formatted as concatenation of hex-encoded policy and asset name).	no
resolve_datums	Boolean	If true, include corresponding datums for datum hashes in the response.	no
with_cbor	Boolean	If true, includes CBOR encodings of transaction outputs in the response.	no
count	Integer	Maximum number of results to return per page.	no
order	String	Sort order for results (asc for ascending or desc for descending).	no
from	int64	Returns only UTxOs created on or after a specific slot number.	no
to	int64	Returns only UTxOs created on or before a specific slot number.	no
cursor	String	Pagination cursor string to fetch the next page of results.

Term	Definition
tx_hash	The unique identifier of the transaction that created this UTXO.
index	The output index of this UTXO within the transaction.
slot	The slot number at which this UTXO was created.
assets	A list of assets contained in this UTXO, including their unit (type) and amount.
address	The address associated with this UTXO.
datum.type	The type of datum associated with this UTXO (e.g., "hash").
datum.hash	The hash of the datum associated with this UTXO.
datum.bytes	The byte representation of the datum (if available), otherwise null.
datum.json	The JSON representation of the datum (if available), otherwise null.
reference_script	A reference to a script associated with this UTXO, if any, otherwise null.
txout_cbor	The CBOR encoding of the transaction output, if available, otherwise null.
last_updated.timestamp	The timestamp indicating when the data was last updated.
last_updated.block_hash	The hash of the block where the UTXO data was last updated.
last_updated.block_slot	The slot number of the block where the UTXO data was last updated.
next_cursor	A pointer to the next set of data if there are more results; otherwise null.

Updated 11 Oct 2024

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