> 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/the-open-network-ton/trylocatetx-ton.md).

# trylocatetx - TON

Example code for the trylocatetx JSON-RPC method. Сomplete guide on how to use trylocatetx JSON-RPC in GetBlock.io Web3 documentation.

This method attempts to locate the outgoing transaction at the destination address, identified by the inbound message parameters (source, destination, and creation logical time). Use it to follow the result of a sent message.

## Parameters

| Parameter   | Type   | Required | Description                                                 |
| ----------- | ------ | -------- | ----------------------------------------------------------- |
| source      | string | Yes      | Source address of the message                               |
| destination | string | Yes      | Destination address of the message                          |
| created\_lt | string | Yes      | Creation logical time of the message (string-encoded int64) |

## Request Example

{% tabs %}
{% tab title="cURL" %}
**REST (GET):**

```bash
curl --location --request GET 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/tryLocateTx?source=EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2&destination=EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2&created_lt=47652103000000' \
--header 'Content-Type: application/json'
```

**JSON-RPC (POST):**

```bash
curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "tryLocateTx",
    "params": {
        "source": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "destination": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "created_lt": "47652103000000"
    },
    "id": "getblock.io"
}'
```

{% endtab %}

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

```javascript
import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "tryLocateTx",
    "params": {
        "source": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "destination": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "created_lt": "47652103000000"
    },
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.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://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "tryLocateTx",
    "params": {
        "source": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "destination": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
        "created_lt": "47652103000000"
    },
    "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": "tryLocateTx",
        "params": {
                "source": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
                "destination": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
                "created_lt": "47652103000000"
        },
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.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
{
    "ok": true,
    "result": {
        "@type": "raw.transaction",
        "utime": 1737869732,
        "transaction_id": {
            "lt": "47652103000003",
            "hash": "AbCdEf\u2026"
        },
        "fee": "5000000",
        "in_msg": {
            "source": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
            "destination": "EQDtFpEwcFAEcRe5mLVh2N6C0x-_hJEM7W61_JLnSF74p4q2",
            "value": "1000000000",
            "created_lt": "47652103000000"
        },
        "out_msgs": []
    },
    "id": "getblock.io",
    "jsonrpc": "2.0"
}
```

{% endcode %}

## Response Parameters

| Field                       | Type    | Description                                  |
| --------------------------- | ------- | -------------------------------------------- |
| result.transaction\_id.lt   | string  | Logical time of the located transaction      |
| result.transaction\_id.hash | string  | Hash of the located transaction              |
| result.utime                | integer | Unix timestamp of the transaction            |
| result.in\_msg              | object  | Inbound message details matching the request |

## Use Cases

* Confirming that a sent message produced a destination-side transaction
* Post-broadcast tracking after `sendBoc`
* Reconstructing message → transaction lineage for analytics

## Error Handling

| Status Code | Error Message       | Cause                                       |
| ----------- | ------------------- | ------------------------------------------- |
| 403         | Forbidden           | Missing or invalid `<ACCESS-TOKEN>`         |
| 422         | Validation Error    | Request parameters are missing or malformed |
| 429         | Too Many Requests   | Rate limit exceeded for your plan           |
| 504         | Lite Server Timeout | Upstream TON liteserver timed out           |

## SDK Integration

{% tabs %}
{% tab title="@ton/ton (JavaScript)" %}

```javascript
import { TonClient } from '@ton/ton';

const client = new TonClient({
    endpoint: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>'
});

// The @ton/ton client wraps the same JSON-RPC methods.
// For low-level access, use client.callGetMethod or client.provider.
```

{% endtab %}

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

```python
from pytoniq import LiteClient
# For HTTP API access, use ton-http-client or call the JSON-RPC
# endpoint directly with requests as shown in the Request Example.
```

{% endtab %}
{% endtabs %}