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Chain IDs

The CHAIN_IDS constant maps human-readable network names to their official chain identifiers. The Network type represents the valid chain ID strings. 
import { CHAIN_IDS, type Network } from "@sei-js/registry";

console.log(CHAIN_IDS.mainnet);  // "pacific-1"
console.log(CHAIN_IDS.testnet);  // "atlantic-2"
console.log(CHAIN_IDS.devnet);   // "arctic-1"

// Use the Network type for type-safe chain references
function getExplorerUrl(network: Network): string {
  const explorers: Record<Network, string> = {
    "pacific-1": "https://seitrace.com",
    "atlantic-2": "https://seitrace.com/?chain=atlantic-2",
    "arctic-1": "https://seitrace.com/?chain=arctic-1",
  };
  return explorers[network];
}

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Chain Info

CHAIN_INFO contains core metadata about the Sei blockchain sourced from the official chain registry. 
import { CHAIN_INFO } from "@sei-js/registry";

console.log(CHAIN_INFO.chain_name);       // "Sei"
console.log(CHAIN_INFO.bech32_prefix);    // "sei"
console.log(CHAIN_INFO.slip44);           // 118
console.log(CHAIN_INFO.fee_token);        // "usei"
console.log(CHAIN_INFO.daemon_name);      // "seid"
console.log(CHAIN_INFO.supported_wallets); // ["compass", "keplr", ...]
Use CHAIN_INFO.bech32_prefix when configuring CosmJS clients instead of hardcoding "sei".

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Networks

NETWORKS provides endpoint configurations for each Sei network, including RPC, REST, gRPC, EVM RPC, EVM WebSocket, explorer, and faucet URLs. 
import { NETWORKS } from "@sei-js/registry";

// Access mainnet configuration
const mainnet = NETWORKS["pacific-1"];

// Get the first RPC endpoint
const rpcUrl = mainnet.rpc[0].url;
const restUrl = mainnet.rest[0].url;

// EVM endpoints (optional, may not exist on all networks)
const evmRpcUrl = mainnet.evm_rpc?.[0]?.url;
const evmWsUrl = mainnet.evm_ws?.[0]?.url;

// Testnet faucets
const testnet = NETWORKS["atlantic-2"];
const faucetUrl = testnet.faucets?.[0]?.url;

// Get all explorers for a network
const explorers = mainnet.explorers ?? [];
for (const explorer of explorers) {
  console.log(`${explorer.name}: ${explorer.url}`);
}

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Configuring a Viem client with registry endpoints

import { createPublicClient, http } from "viem";
import { sei } from "viem/chains";
import { NETWORKS } from "@sei-js/registry";

const evmRpc = NETWORKS["pacific-1"].evm_rpc?.[0]?.url;

const client = createPublicClient({
  chain: sei,
  transport: http(evmRpc),
});

const blockNumber = await client.getBlockNumber();
console.log("Current block:", blockNumber);

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Token List

TOKEN_LIST is a community-maintained mapping of tokens per network. Each token includes its name, symbol, denominations, and optional image URLs.
The token list is community-driven and subject to change. Always verify and filter tokens before use in production.
import { TOKEN_LIST } from "@sei-js/registry";

// Find a specific token on mainnet
const seiToken = TOKEN_LIST["pacific-1"].find((t) => t.symbol === "sei");
console.log(seiToken?.name);        // "Sei"
console.log(seiToken?.base);        // "usei"
console.log(seiToken?.display);     // "sei"
console.log(seiToken?.denom_units); // [{ denom: "usei", exponent: 0, aliases: [] }, ...]

// Get all token symbols on testnet
const testnetSymbols = TOKEN_LIST["atlantic-2"].map((t) => t.symbol);
console.log(testnetSymbols);

// Access token images
const tokenWithImage = TOKEN_LIST["pacific-1"].find((t) => t.images?.png);
console.log(tokenWithImage?.images.png);

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IBC Info

IBC_INFO provides IBC channel configurations for cross-chain communication on each Sei network. 
import { IBC_INFO } from "@sei-js/registry";

// Find the Cosmos Hub IBC channel on mainnet
const cosmosChannel = IBC_INFO["pacific-1"].find(
  (ch) => ch.counterparty_chain_name === "cosmoshub-4"
);

if (cosmosChannel) {
  console.log(cosmosChannel.src_channel);  // Sei-side channel
  console.log(cosmosChannel.dst_channel);  // Cosmos Hub-side channel
  console.log(cosmosChannel.port_id);      // "transfer"
}

// List all IBC connections for a network
for (const channel of IBC_INFO["pacific-1"]) {
  console.log(`${channel.counterparty_chain_name}: ${channel.src_channel} → ${channel.dst_channel}`);
}

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Gas Info

GAS_INFO contains gas denomination, minimum gas prices, and module-specific gas adjustments per network. 
import { GAS_INFO } from "@sei-js/registry";

const mainnetGas = GAS_INFO["pacific-1"];

console.log(mainnetGas.denom);         // "usei"
console.log(mainnetGas.min_gas_price); // minimum gas price

// Module-specific gas adjustments
const dexGas = mainnetGas.module_adjustments.dex;
console.log(dexGas.order_placement);    // gas price for DEX order placement
console.log(dexGas.order_cancellation); // gas price for DEX order cancellation
console.log(dexGas.sudo_gas_price);     // superuser gas price

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Setting gas in a CosmJS transaction

import { GAS_INFO } from "@sei-js/registry";
import type { StdFee } from "@cosmjs/stargate";

const gasInfo = GAS_INFO["pacific-1"];

const fee: StdFee = {
  amount: [{ denom: gasInfo.denom, amount: "20000" }],
  gas: "200000",
};