sei_associate - SEI

Example code for the sei_associate JSON-RPC method. Complete guide on how to use sei_associate JSON-RPC in GetBlock Web3 documentation

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

cURL

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"
}'

JavaScript (axios)

Python (requests)

Rust (reqwest)

Response

{
    "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

Ethers.js

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);

Viem