> For the complete documentation index, see [llms.txt](https://docs.getblock.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.getblock.io/api-reference/monero-xmr/get_output_histogram-monero.md).

# get\_output\_histogram -Monero

This method returns a histogram of RingCT outputs by amount. Wallets use this data to construct ring signatures with appropriate decoys.

## Parameters

| Parameter      | Type                  | Required | Description                                                             |
| -------------- | --------------------- | -------- | ----------------------------------------------------------------------- |
| amounts        | array of unsigned int | No       | Specific amounts to bucket. Defaults to all                             |
| min\_count     | unsigned int          | No       | Minimum count per bucket                                                |
| max\_count     | unsigned int          | No       | Maximum count per bucket                                                |
| unlocked       | boolean               | No       | If `true`, only count unlocked outputs                                  |
| recent\_cutoff | unsigned int          | No       | If non-zero, also report buckets with outputs since this Unix timestamp |

## Request Example

{% tabs %}
{% tab title="cURL" %}

```bash
curl --location --request POST 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "get_output_histogram",
    "params": {
        "amounts": [
            20000000000
        ],
        "min_count": 0,
        "max_count": 0,
        "unlocked": true,
        "recent_cutoff": 0
    },
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (Axios)" %}

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "get_output_histogram",
    "params": {
        "amounts": [
            20000000000
        ],
        "min_count": 0,
        "max_count": 0,
        "unlocked": true,
        "recent_cutoff": 0
    },
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://go.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));
```

{% endtab %}

{% tab title="Python (Requests)" %}

```python
import requests
import json

url = "https://go.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "get_output_histogram",
    "params": {
        "amounts": [
            20000000000
        ],
        "min_count": 0,
        "max_count": 0,
        "unlocked": true,
        "recent_cutoff": 0
    },
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)
```

{% endtab %}

{% tab title="Rust (Reqwest)" %}

```rust
use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "get_output_histogram",
        "params": {
                "amounts": [
                        20000000000
                ],
                "min_count": 0,
                "max_count": 0,
                "unlocked": true,
                "recent_cutoff": 0
        },
        "id": "getblock.io"
});

    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}
```

{% endtab %}
{% endtabs %}

## Response Example

{% code overflow="wrap" %}

```json
{
    "id": "getblock.io",
    "jsonrpc": "2.0",
    "result": {
        "histogram": [
            {
                "amount": 20000000000,
                "recent_instances": 0,
                "total_instances": 381458,
                "unlocked_instances": 381458
            }
        ],
        "status": "OK",
        "untrusted": false
    }
}
```

{% endcode %}

## Response Parameters

| Field                                   | Type         | Description                                       |
| --------------------------------------- | ------------ | ------------------------------------------------- |
| result.histogram                        | array        | Array of histogram buckets                        |
| result.histogram\[].amount              | unsigned int | Output amount in atomic units                     |
| result.histogram\[].total\_instances    | unsigned int | Total outputs of this amount on chain             |
| result.histogram\[].unlocked\_instances | unsigned int | Of the above, how many are unlocked and spendable |
| result.histogram\[].recent\_instances   | unsigned int | Recent outputs (if `recent_cutoff` was supplied)  |

## Use Cases

* Wallet decoy selection for ring signatures
* Anonymity-set research and analytics
* Auditing chain composition over time

## Error Handling

| Status Code | Error Message     | Cause                                       |
| ----------- | ----------------- | ------------------------------------------- |
| 404         | Not Found         | Missing or invalid `<ACCESS-TOKEN>`         |
| -32602      | Invalid params    | Request parameters are missing or malformed |
| 429         | Too Many Requests | Rate limit exceeded for your plan           |

## SDK Integration

{% tabs %}
{% tab title="monero-javascript" %}
{% code overflow="wrap" %}

```javascript
import monerojs from 'monero-javascript';

const daemon = await monerojs.connectToDaemonRpc('https://go.getblock.io/<ACCESS-TOKEN>/');

// Most methods are exposed directly on the daemon client. For raw access:
const result = await daemon.getDaemonConnection().sendJsonRequest('get_output_histogram', {"amounts": [20000000000], "min_count": 0, "max_count": 0, "unlocked": true, "recent_cutoff": 0});
console.log(result);
```

{% endcode %}
{% endtab %}

{% tab title="monero-python" %}
{% code overflow="wrap" %}

```python
from monero.backends.jsonrpc import JSONRPCDaemon
from monero.daemon import Daemon

backend = JSONRPCDaemon(host='go.getblock.io', port=443, path='/<ACCESS-TOKEN>/', protocol='https')
daemon = Daemon(backend)

# For methods covered by the typed API, use the daemon attribute directly.
# For raw RPC access:
result = backend.raw_request('get_output_histogram', {"amounts": [20000000000], "min_count": 0, "max_count": 0, "unlocked": true, "recent_cutoff": 0})
print(result)
```

{% endcode %}
{% endtab %}
{% endtabs %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.getblock.io/api-reference/monero-xmr/get_output_histogram-monero.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.