SEI

GetBlock provides fast and reliable access to Sei nodes via JSON-RPC API. Connect to the Sei network without running your own infrastructure.

Sei is a high-performance Layer 1 blockchain and the first parallelized EVM, designed to deliver Web2-like experiences for decentralized applications. Built on the Cosmos SDK with Twin Turbo Consensus, Sei achieves sub-400 millisecond finality and can process up to 200,000 transactions per second. The network features optimistic parallelization that allows transactions to execute simultaneously, SeiDB for optimized storage, and full EVM compatibility enabling seamless deployment of Ethereum smart contracts. Sei also supports cross-VM interoperability between EVM and CosmWasm environments.

Key Features

• First Parallelized EVM: Optimistic parallelization enables concurrent transaction execution without developer-defined dependencies

• Ultra-Fast Finality: Twin Turbo Consensus achieves ~400ms block times with instant finality

• High Throughput: Capable of processing up to 200,000 TPS with 100 megagas per second

• Full EVM Compatibility: Deploy Ethereum smart contracts without modification using familiar tools

• Cross-VM Interoperability: Seamless composability between EVM and CosmWasm environments

• SeiDB Storage: Optimized database architecture for faster reads/writes and reduced state bloat

• Sub-Cent Fees: Extremely low transaction costs for users

• SEI Native Token: Used for gas fees, staking, and governance (18 decimals)

• Cosmos Ecosystem: Built on Cosmos SDK with IBC support for cross-chain communication

TECHNICAL DISCLAIMER: AUTHORITATIVE JSON-RPC API SPECIFICATION

GetBlock's RPC API reference documentation is provided exclusively for informational purposes and streamlined developer experience optimization. The canonical and normative specification for Ethereum Virtual Machine (EVM) JSON-RPC methods is solely maintained and published through the official Ethereum Foundation documentation portal at ethereum.org. This resource constitutes the sole authoritative reference implementation of the JSON-RPC 2.0 protocol interface across EVM-compatible execution clients.

Network Information

Property	Value
Network Name	Sei Mainnet
Chain ID	1329
Native Currency	SEI
Decimals	18
Network Type	Layer 1 (Parallelized EVM)
Block Time	~400 milliseconds
Finality	Instant (~400ms)

Base URL

Frankfurt, Germany

https://go.getblock.io

Singapore, Singapore

New York, USA

Supported Networks

Network	Chain ID	JSON RPC	WSS
Mainnet	1329	✅	✅

Quickstart

In this section, you will learn how to make your first call with either:

• Axios

• Python

Before you begin, you must have already installed npm or yarn on your local machine (for the Axios example) or Python and pip (for the Python example).

Javascript(Axios)

1

Setup project

Create and initialize a new project:

mkdir sei-api-quickstart
cd sei-api-quickstart
npm init --yes

2

Install Axios

npm install axios

3

Create file

Create a new file named index.js. This is where you will make your first call.

4

Set ES module type

Set the ES module "type": "module" in your package.json.

5

Add code

Add the following code to index.js:

index.js

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "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)))
    .catch(error => console.log(error));

Replace <ACCESS-TOKEN> with your actual access token from GetBlock.

6

Run the script

node index.js

Expected output (example):

{
    "jsonrpc": "2.0",
    "id": "getblock.io",
    "result": "0xb6fd83a"
}

Python(Request)

Available API Methods

GetBlock provides access to standard Ethereum JSON-RPC methods and Sei-specific extensions for the Sei network.

Transaction Methods

Method	Description
eth_getTransactionByHash	Returns transaction by hash
eth_getTransactionByBlockHashAndIndex	Returns transaction by block hash and index
eth_getTransactionByBlockNumberAndIndex	Returns transaction by block number and index
eth_getTransactionCount	Returns the transaction count (nonce)
eth_getTransactionReceipt	Returns the receipt of a transaction
eth_sendRawTransaction	Submits a signed transaction

Block Methods

Method	Description
eth_blockNumber	Returns the current block number
eth_getBlockByHash	Returns block by hash
eth_getBlockByNumber	Returns block by number
eth_getBlockReceipts	Returns all receipts for a block
eth_getBlockTransactionCountByHash	Returns transaction count by block hash
eth_getBlockTransactionCountByNumber	Returns transaction count by block number

Account/State Methods

Method	Description
eth_getBalance	Returns the SEI balance of an address
eth_getStorageAt	Returns the value at a storage position
eth_getCode	Returns the code at an address
eth_call	Executes a call without creating a transaction
eth_getProof	Returns account and storage proof
eth_accounts	Returns a list of addresses owned by client

Gas and Fee Methods

Method	Description
eth_gasPrice	Returns the current gas price
eth_estimateGas	Estimates gas for a transaction
eth_feeHistory	Returns historical gas information

Filter Methods

Method	Description
eth_getLogs	Returns logs matching filter criteria
eth_newFilter	Creates a log filter
eth_newBlockFilter	Creates a block filter
eth_getFilterChanges	Returns filter changes since last poll
eth_getFilterLogs	Returns all logs matching filter
eth_uninstallFilter	Removes a filter

Network/Chain Methods

Method	Description
eth_chainId	Returns the chain ID (1329)
eth_coinbase	Returns the fee-collector address
eth_syncing	Returns sync status
net_version	Returns the network ID
web3_clientVersion	Returns client version

Debug Methods

Method	Description
debug_traceBlockByHash	Traces all transactions in a block by hash
debug_traceBlockByNumber	Traces block by number
debug_traceTransaction	Traces a specific transaction

Sei-Specific Methods

Method	Description
sei_associate	Associates Sei address with EVM address
sei_getBlockReceipts	Returns block receipts including synthetic transactions
sei_getLogs	Returns logs including synthetic logs from Cosmos events
sei_getFilterLogs	Returns filter logs including synthetic logs
sei_traceBlockByNumberExcludeTraceFail	Traces block excluding failed traces
sei_getTransactionReceiptExcludeTraceFail	Returns receipt excluding failed traces

Support

For technical support and questions:

• Support: [email protected]

See Also

• Sei Developer Docs

• Sei Explorer (Seiscan)

• Sei Explorer (SeiTrace)

• Sei Bridge

• Ethereum JSON RPC API

• Sei Website