# sei\_associate - SEI

Sends a transaction to establish an association between the signer's Sei address and EVM address on-chain. This enables cross-VM interactions between Cosmos and EVM environments on Sei.

## Parameters

| Parameter       | Type   | Description                                                                          |
| --------------- | ------ | ------------------------------------------------------------------------------------ |
| associationData | object | Object containing 'custom\_message', 'r', 's', 'v' fields for the signed association |

## Request

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

```bash
curl --location 'https://go.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data '{
    "jsonrpc": "2.0",
    "method": "sei_associate",
    "params": [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}],
    "id": "getblock.io"
}'
```

{% endtab %}

{% tab title="JavaScript (axios)" %}
{% code title="example.js" %}

```javascript
import axios from 'axios';

const url = 'https://go.getblock.io/<ACCESS-TOKEN>/';

const payload = {
    jsonrpc: '2.0',
    method: 'sei_associate',
    params: [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}],
    id: 'getblock.io'
};

axios.post(url, payload, {
    headers: { 'Content-Type': 'application/json' }
})
.then(response => console.log(response.data))
.catch(error => console.error(error));
```

{% endcode %}
{% endtab %}

{% tab title="Python (requests)" %}
{% code title="example.py" %}

```python
import requests
import json

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

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "sei_associate",
    "params": [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}],
    "id": "getblock.io"
})

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

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

{% endcode %}
{% endtab %}

{% tab title="Rust (reqwest)" %}
{% code title="main.rs" %}

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

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();
    
    let response = client
        .post("https://go.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&json!({
            "jsonrpc": "2.0",
            "method": "sei_associate",
            "params": [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}],
            "id": "getblock.io"
        }))
        .send()
        .await?;
    
    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);
    
    Ok(())
}
```

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

## Response

```json
{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"
}
```

## Response Parameters

| Field  | Type   | Description                                         |
| ------ | ------ | --------------------------------------------------- |
| result | string | The transaction hash of the association transaction |

## Use Case

The `sei_associate` method is essential for:

* Blockchain developers building applications on Sei
* Wallet applications requiring network data
* Analytics platforms tracking Sei network activity
* DeFi protocols integrating with Sei's parallelized EVM

## Error Handling

| Error Code | Message          | Description                                |
| ---------- | ---------------- | ------------------------------------------ |
| -32700     | Parse error      | Invalid JSON                               |
| -32600     | Invalid Request  | JSON is not a valid request object         |
| -32601     | Method not found | Method does not exist                      |
| -32602     | Invalid params   | Invalid method parameters                  |
| -32603     | Internal error   | Internal JSON-RPC error                    |
| -32000     | Invalid input    | Generic input error                        |
| -32500     | Cross-VM error   | Error in cross-VM operation (Sei-specific) |

## Web3 Integration

{% tabs %}
{% tab title="Ethers.js" %}

```javascript
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://go.getblock.io/<ACCESS-TOKEN>/');

// Using ethers provider methods
const result = await provider.send('sei_associate', [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}]);
console.log(result);
```

{% endtab %}

{% tab title="Viem" %}

```javascript
import { createPublicClient, http } from 'viem';
import { sei } from 'viem/chains';

const client = createPublicClient({
    chain: sei,
    transport: http('https://go.getblock.io/<ACCESS-TOKEN>/')
});

// Using viem's request method
const result = await client.request({
    method: 'sei_associate',
    params: [{"custom_message": "Associate my addresses", "r": "0x...", "s": "0x...", "v": "0x1b"}]
});
console.log(result);
```

{% endtab %}
{% endtabs %}


---

# Agent Instructions: 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/sei/sei_associate-sei.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.