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feat: integrate Sei (eip155:1329) as second-class citizen via Relay #11928

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f16cfca
feat: integrate sei (eip155:1329) as second-class citizen via relay
NeOMakinG Feb 17, 2026
7a58c87
feat: sei assets
NeOMakinG Feb 18, 2026
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2 changes: 2 additions & 0 deletions .env
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Expand Up @@ -157,6 +157,7 @@ VITE_MONAD_NODE_URL=https://rpc.monad.xyz
VITE_PLASMA_NODE_URL=https://rpc.plasma.to
VITE_MEGAETH_NODE_URL=https://mainnet.megaeth.com/rpc
VITE_KATANA_NODE_URL=https://rpc.katana.network
VITE_SEI_NODE_URL=https://evm-rpc.sei-apis.com/
VITE_THORCHAIN_NODE_URL=https://api.thorchain.shapeshift.com/lcd
VITE_MAYACHAIN_NODE_URL=https://api.mayachain.shapeshift.com/lcd
VITE_SOLANA_NODE_URL=https://api.solana.shapeshift.com/api/v1/jsonrpc
Expand Down Expand Up @@ -304,6 +305,7 @@ VITE_FEATURE_HYPEREVM=true
VITE_FEATURE_MEGAETH=false
VITE_FEATURE_NEAR=true
VITE_FEATURE_KATANA=true
VITE_FEATURE_SEI=false

# Yield.xyz Feature Flag
VITE_FEATURE_YIELD_XYZ=true
Expand Down
1 change: 1 addition & 0 deletions .env.development
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Expand Up @@ -96,6 +96,7 @@ VITE_FEATURE_WC_DIRECT_CONNECTION=true
VITE_FEATURE_CETUS_SWAP=true
VITE_FEATURE_MEGAETH=true
VITE_FEATURE_KATANA=true
VITE_FEATURE_SEI=true
VITE_FEATURE_TON=true
VITE_FEATURE_STONFI_SWAP=true
VITE_FEATURE_ACROSS_SWAP=true
Expand Down
10 changes: 10 additions & 0 deletions headers/csps/chains/sei.ts
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@@ -0,0 +1,10 @@
import { loadEnv } from 'vite'

import type { Csp } from '../../types'

const mode = process.env.MODE ?? process.env.NODE_ENV ?? 'development'
const env = loadEnv(mode, process.cwd(), '')

export const csp: Csp = {
'connect-src': [env.VITE_SEI_NODE_URL],
}
2 changes: 2 additions & 0 deletions headers/csps/index.ts
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Expand Up @@ -24,6 +24,7 @@ import { csp as near } from './chains/near'
import { csp as optimism } from './chains/optimism'
import { csp as plasma } from './chains/plasma'
import { csp as polygon } from './chains/polygon'
import { csp as sei } from './chains/sei'
import { csp as solana } from './chains/solana'
import { csp as starknet } from './chains/starknet'
import { csp as sui } from './chains/sui'
Expand Down Expand Up @@ -131,6 +132,7 @@ export const csps = [
monad,
near,
plasma,
sei,
trustwallet,
coincap,
coingecko,
Expand Down
1 change: 1 addition & 0 deletions packages/caip/src/adapters/coingecko/generated/eip155_1329/adapter.json
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@@ -0,0 +1 @@
{"eip155:1329/slip44:60":"sei-network"}
2 changes: 2 additions & 0 deletions packages/caip/src/adapters/coingecko/generated/index.ts
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Expand Up @@ -14,6 +14,7 @@ import monad from "./eip155_143/adapter.json";
import hyperevm from "./eip155_999/adapter.json";
import plasma from "./eip155_9745/adapter.json";
import katana from "./eip155_747474/adapter.json";
import sei from "./eip155_1329/adapter.json";
import megaeth from "./eip155_4326/adapter.json";
import cosmos from "./cosmos_cosmoshub-4/adapter.json";
import thorchain from "./cosmos_thorchain-1/adapter.json";
Expand Down Expand Up @@ -43,6 +44,7 @@ export {
hyperevm,
plasma,
katana,
sei,
megaeth,
cosmos,
thorchain,
Expand Down
6 changes: 6 additions & 0 deletions packages/caip/src/adapters/coingecko/index.ts
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Expand Up @@ -23,6 +23,7 @@ import {
optimismChainId,
plasmaChainId,
polygonChainId,
seiChainId,
solanaChainId,
starknetChainId,
suiChainId,
Expand Down Expand Up @@ -51,6 +52,7 @@ export enum CoingeckoAssetPlatform {
HyperEvm = 'hyperevm',
Plasma = 'plasma',
Katana = 'katana',
Sei = 'sei-v2',
MegaEth = 'megaeth',
Solana = 'solana',
Starknet = 'starknet',
Expand Down Expand Up @@ -112,6 +114,8 @@ export const chainIdToCoingeckoAssetPlatform = (chainId: ChainId): string => {
return CoingeckoAssetPlatform.Plasma
case CHAIN_REFERENCE.KatanaMainnet:
return CoingeckoAssetPlatform.Katana
case CHAIN_REFERENCE.SeiMainnet:
return CoingeckoAssetPlatform.Sei
case CHAIN_REFERENCE.MegaEthMainnet:
return CoingeckoAssetPlatform.MegaEth
default:
Expand Down Expand Up @@ -221,6 +225,8 @@ export const coingeckoAssetPlatformToChainId = (
return plasmaChainId
case CoingeckoAssetPlatform.Katana:
return katanaChainId
case CoingeckoAssetPlatform.Sei:
return seiChainId
case CoingeckoAssetPlatform.MegaEth:
return megaethChainId
case CoingeckoAssetPlatform.Cosmos:
Expand Down
3 changes: 3 additions & 0 deletions packages/caip/src/adapters/coingecko/utils.test.ts
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Expand Up @@ -182,6 +182,9 @@ describe('adapters:coingecko:utils', () => {
'eip155:747474': {
'eip155:747474/slip44:60': 'katana',
},
'eip155:1329': {
'eip155:1329/slip44:60': 'sei-network',
},
'near:mainnet': {
'near:mainnet/slip44:397': 'near',
},
Expand Down
17 changes: 17 additions & 0 deletions packages/caip/src/adapters/coingecko/utils.ts
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Expand Up @@ -42,6 +42,8 @@ import {
plasmaChainId,
polygonAssetId,
polygonChainId,
seiAssetId,
seiChainId,
solanaChainId,
solAssetId,
starknetAssetId,
Expand Down Expand Up @@ -303,6 +305,20 @@ export const parseData = (coins: CoingeckoCoin[]): AssetMap => {
}
}

if (Object.keys(platforms).includes(CoingeckoAssetPlatform.Sei)) {
try {
const assetId = toAssetId({
chainNamespace: CHAIN_NAMESPACE.Evm,
chainReference: CHAIN_REFERENCE.SeiMainnet,
assetNamespace: 'erc20',
assetReference: platforms[CoingeckoAssetPlatform.Sei],
})
prev[seiChainId][assetId] = id
} catch {
// unable to create assetId, skip token
}
}

if (Object.keys(platforms).includes(CoingeckoAssetPlatform.Starknet)) {
try {
const assetId = toAssetId({
Expand Down Expand Up @@ -361,6 +377,7 @@ export const parseData = (coins: CoingeckoCoin[]): AssetMap => {
[plasmaChainId]: { [plasmaAssetId]: 'plasma' },
[megaethChainId]: { [megaethAssetId]: 'ethereum' },
[katanaChainId]: { [katanaAssetId]: 'katana' },
[seiChainId]: { [seiAssetId]: 'sei-network' },
[solanaChainId]: { [solAssetId]: 'solana' },
[starknetChainId]: { [starknetAssetId]: 'starknet' },
[tronChainId]: { [tronAssetId]: 'tron' },
Expand Down
5 changes: 5 additions & 0 deletions packages/caip/src/constants.ts
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Expand Up @@ -20,6 +20,7 @@ export const hyperEvmAssetId: AssetId = 'eip155:999/slip44:60'
export const plasmaAssetId: AssetId = 'eip155:9745/slip44:60'
export const megaethAssetId: AssetId = 'eip155:4326/slip44:60'
export const katanaAssetId: AssetId = 'eip155:747474/slip44:60'
export const seiAssetId: AssetId = 'eip155:1329/slip44:60'
export const solAssetId: AssetId = 'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp/slip44:501'
export const wrappedSolAssetId: AssetId =
'solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp/token:So11111111111111111111111111111111111111112'
Expand Down Expand Up @@ -81,6 +82,7 @@ export const hyperEvmChainId: ChainId = 'eip155:999'
export const plasmaChainId: ChainId = 'eip155:9745'
export const megaethChainId: ChainId = 'eip155:4326'
export const katanaChainId: ChainId = 'eip155:747474'
export const seiChainId: ChainId = 'eip155:1329'

export const cosmosChainId: ChainId = 'cosmos:cosmoshub-4'
export const thorchainChainId: ChainId = 'cosmos:thorchain-1'
Expand Down Expand Up @@ -133,6 +135,7 @@ export const CHAIN_REFERENCE = {
PlasmaMainnet: '9745', // https://chainlist.org/chain/9745
MegaEthMainnet: '4326',
KatanaMainnet: '747474', // https://docs.katana.network
SeiMainnet: '1329', // https://docs.sei.io
SolanaMainnet: '5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp', // https://namespaces.chainagnostic.org/solana/caip2
TronMainnet: '0x2b6653dc', // https://developers.tron.network/docs/networks
SuiMainnet: '35834a8a', // First 8 chars of SUI mainnet genesis hash
Expand Down Expand Up @@ -178,6 +181,7 @@ export const ASSET_REFERENCE = {
Plasma: '60', // evm chain which uses ethereum derivation path as common practice
MegaEth: '60', // evm chain which uses ethereum derivation path as common practice
Katana: '60', // evm chain which uses ethereum derivation path as common practice
Sei: '60', // evm chain which uses ethereum derivation path as common practice
Solana: '501',
Tron: '195',
Sui: '784',
Expand Down Expand Up @@ -208,6 +212,7 @@ export const VALID_CHAIN_IDS: ValidChainMap = Object.freeze({
CHAIN_REFERENCE.PlasmaMainnet,
CHAIN_REFERENCE.MegaEthMainnet,
CHAIN_REFERENCE.KatanaMainnet,
CHAIN_REFERENCE.SeiMainnet,
],
[CHAIN_NAMESPACE.CosmosSdk]: [
CHAIN_REFERENCE.CosmosHubMainnet,
Expand Down
9 changes: 9 additions & 0 deletions packages/chain-adapters/src/evm/EvmBaseAdapter.ts
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Expand Up @@ -21,6 +21,7 @@ import {
supportsOptimism,
supportsPlasma,
supportsPolygon,
supportsSei,
} from '@shapeshiftoss/hdwallet-core'
import type { Bip44Params, EvmChainId, RootBip44Params } from '@shapeshiftoss/types'
import { KnownChainIds } from '@shapeshiftoss/types'
Expand Down Expand Up @@ -88,6 +89,7 @@ export const evmChainIds = [
KnownChainIds.PlasmaMainnet,
KnownChainIds.MegaEthMainnet,
KnownChainIds.KatanaMainnet,
KnownChainIds.SeiMainnet,
] as const

export type EvmChainAdapter = EvmBaseAdapter<EvmChainId>
Expand Down Expand Up @@ -192,6 +194,8 @@ export abstract class EvmBaseAdapter<T extends EvmChainId> implements IChainAdap
return supportsMegaEth(wallet)
case Number(fromChainId(KnownChainIds.KatanaMainnet).chainReference):
return supportsKatana(wallet)
case Number(fromChainId(KnownChainIds.SeiMainnet).chainReference):
return supportsSei(wallet)
default:
return false
}
Expand Down Expand Up @@ -289,6 +293,11 @@ export abstract class EvmBaseAdapter<T extends EvmChainId> implements IChainAdap
symbol: 'ETH',
explorer: 'https://katanascan.com',
},
[KnownChainIds.SeiMainnet]: {
name: 'SEI',
symbol: 'SEI',
explorer: 'https://seitrace.com',
},
}[this.chainId]

try {
Expand Down
1 change: 1 addition & 0 deletions packages/chain-adapters/src/evm/index.ts
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Expand Up @@ -18,3 +18,4 @@ export * as hyperevm from './hyperevm'
export * as plasma from './plasma'
export * as megaeth from './megaeth'
export * as katana from './katana'
export * as sei from './sei'
57 changes: 57 additions & 0 deletions packages/chain-adapters/src/evm/sei/SeiChainAdapter.ts
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import type { AssetId } from '@shapeshiftoss/caip'
import { ASSET_REFERENCE, seiAssetId } from '@shapeshiftoss/caip'
import type { RootBip44Params } from '@shapeshiftoss/types'
import { KnownChainIds } from '@shapeshiftoss/types'

import { ChainAdapterDisplayName } from '../../types'
import type { TokenInfo } from '../SecondClassEvmAdapter'
import { SecondClassEvmAdapter } from '../SecondClassEvmAdapter'

const SUPPORTED_CHAIN_IDS = [KnownChainIds.SeiMainnet]
const DEFAULT_CHAIN_ID = KnownChainIds.SeiMainnet

export type ChainAdapterArgs = {
rpcUrl: string
getKnownTokens: () => TokenInfo[]
}

export const isSeiChainAdapter = (adapter: unknown): adapter is ChainAdapter => {
return (adapter as ChainAdapter).getType() === KnownChainIds.SeiMainnet
}
Comment on lines +18 to +20
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@coderabbitai coderabbitai bot Feb 18, 2026

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⚠️ Potential issue | 🟡 Minor

isSeiChainAdapter will throw on null/undefined input — the adapter: unknown type does not preclude null, and (adapter as ChainAdapter).getType() will produce a TypeError without a null guard.

🛡️ Proposed fix 
 export const isSeiChainAdapter = (adapter: unknown): adapter is ChainAdapter => {
+  if (!adapter) return false
   return (adapter as ChainAdapter).getType() === KnownChainIds.SeiMainnet
 }
🤖 Prompt for AI Agents 
Verify each finding against the current code and only fix it if needed.

In `@packages/chain-adapters/src/evm/sei/SeiChainAdapter.ts` around lines 18 - 20,
The type-guard isSeiChainAdapter currently calls (adapter as
ChainAdapter).getType() without null/undefined protection and will throw for
nullish inputs; update isSeiChainAdapter to first check adapter is not
null/undefined and that (adapter as any).getType is a function before calling
it, then return whether getType() === KnownChainIds.SeiMainnet (referencing
isSeiChainAdapter, getType, and KnownChainIds.SeiMainnet in your change).


export class ChainAdapter extends SecondClassEvmAdapter<KnownChainIds.SeiMainnet> {
public static readonly rootBip44Params: RootBip44Params = {
purpose: 44,
coinType: Number(ASSET_REFERENCE.Sei),
accountNumber: 0,
}

constructor(args: ChainAdapterArgs) {
super({
assetId: seiAssetId,
chainId: DEFAULT_CHAIN_ID,
rootBip44Params: ChainAdapter.rootBip44Params,
supportedChainIds: SUPPORTED_CHAIN_IDS,
rpcUrl: args.rpcUrl,
getKnownTokens: args.getKnownTokens,
})
}

getDisplayName() {
return ChainAdapterDisplayName.Sei
}

getName() {
return 'Sei'
}

getType(): KnownChainIds.SeiMainnet {
return KnownChainIds.SeiMainnet
}

getFeeAssetId(): AssetId {
return this.assetId
}
}

export type { TokenInfo }
1 change: 1 addition & 0 deletions packages/chain-adapters/src/evm/sei/index.ts
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export * from './SeiChainAdapter'
6 changes: 6 additions & 0 deletions packages/chain-adapters/src/types.ts
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Expand Up @@ -49,6 +49,7 @@ type ChainSpecificAccount<T> = ChainSpecific<
[KnownChainIds.PlasmaMainnet]: evm.Account
[KnownChainIds.MegaEthMainnet]: evm.Account
[KnownChainIds.KatanaMainnet]: evm.Account
[KnownChainIds.SeiMainnet]: evm.Account
[KnownChainIds.BitcoinMainnet]: utxo.Account
[KnownChainIds.BitcoinCashMainnet]: utxo.Account
[KnownChainIds.DogecoinMainnet]: utxo.Account
Expand Down Expand Up @@ -101,6 +102,7 @@ type ChainSpecificFeeData<T> = ChainSpecific<
[KnownChainIds.PlasmaMainnet]: evm.FeeData
[KnownChainIds.MegaEthMainnet]: evm.FeeData
[KnownChainIds.KatanaMainnet]: evm.FeeData
[KnownChainIds.SeiMainnet]: evm.FeeData
[KnownChainIds.BitcoinMainnet]: utxo.FeeData
[KnownChainIds.BitcoinCashMainnet]: utxo.FeeData
[KnownChainIds.DogecoinMainnet]: utxo.FeeData
Expand Down Expand Up @@ -186,6 +188,7 @@ export type ChainSignTx = {
[KnownChainIds.PlasmaMainnet]: ETHSignTx
[KnownChainIds.MegaEthMainnet]: ETHSignTx
[KnownChainIds.KatanaMainnet]: ETHSignTx
[KnownChainIds.SeiMainnet]: ETHSignTx
[KnownChainIds.BitcoinMainnet]: BTCSignTx
[KnownChainIds.BitcoinCashMainnet]: BTCSignTx
[KnownChainIds.DogecoinMainnet]: BTCSignTx
Expand Down Expand Up @@ -243,6 +246,7 @@ export type ChainSpecificBuildTxData<T> = ChainSpecific<
[KnownChainIds.PlasmaMainnet]: evm.BuildTxInput
[KnownChainIds.MegaEthMainnet]: evm.BuildTxInput
[KnownChainIds.KatanaMainnet]: evm.BuildTxInput
[KnownChainIds.SeiMainnet]: evm.BuildTxInput
[KnownChainIds.BitcoinMainnet]: utxo.BuildTxInput
[KnownChainIds.BitcoinCashMainnet]: utxo.BuildTxInput
[KnownChainIds.DogecoinMainnet]: utxo.BuildTxInput
Expand Down Expand Up @@ -350,6 +354,7 @@ type ChainSpecificGetFeeDataInput<T> = ChainSpecific<
[KnownChainIds.PlasmaMainnet]: evm.GetFeeDataInput
[KnownChainIds.MegaEthMainnet]: evm.GetFeeDataInput
[KnownChainIds.KatanaMainnet]: evm.GetFeeDataInput
[KnownChainIds.SeiMainnet]: evm.GetFeeDataInput
[KnownChainIds.BitcoinMainnet]: utxo.GetFeeDataInput
[KnownChainIds.BitcoinCashMainnet]: utxo.GetFeeDataInput
[KnownChainIds.DogecoinMainnet]: utxo.GetFeeDataInput
Expand Down Expand Up @@ -422,6 +427,7 @@ export enum ChainAdapterDisplayName {
Plasma = 'Plasma',
MegaEth = 'MegaETH',
Katana = 'Katana',
Sei = 'Sei',
Cosmos = 'Cosmos',
Bitcoin = 'Bitcoin',
BitcoinCash = 'Bitcoin Cash',
Expand Down
2 changes: 2 additions & 0 deletions packages/contracts/src/ethersProviderSingleton.ts
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Expand Up @@ -34,6 +34,8 @@ export const rpcUrlByChainId = (chainId: EvmChainId): string => {
return process.env.VITE_MEGAETH_NODE_URL
case KnownChainIds.KatanaMainnet:
return process.env.VITE_KATANA_NODE_URL
case KnownChainIds.SeiMainnet:
return process.env.VITE_SEI_NODE_URL
default:
return assertUnreachable(chainId)
}
Expand Down
9 changes: 9 additions & 0 deletions packages/contracts/src/viemClient.ts
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Expand Up @@ -16,6 +16,7 @@ import {
optimism,
plasma,
polygon,
sei,
} from 'viem/chains'

const megaeth = defineChain({
Expand Down Expand Up @@ -117,6 +118,11 @@ export const viemKatanaClient = createPublicClient({
transport: fallback([process.env.VITE_KATANA_NODE_URL].filter(Boolean).map(url => http(url))),
}) as PublicClient

export const viemSeiClient = createPublicClient({
chain: sei,
transport: fallback([process.env.VITE_SEI_NODE_URL].filter(Boolean).map(url => http(url))),
}) as PublicClient

export const viemClientByChainId: Record<ChainId, PublicClient> = {
[KnownChainIds.EthereumMainnet]: viemEthMainnetClient,
[KnownChainIds.BnbSmartChainMainnet]: viemBscClient,
Expand All @@ -131,6 +137,7 @@ export const viemClientByChainId: Record<ChainId, PublicClient> = {
[KnownChainIds.PlasmaMainnet]: viemPlasmaClient,
[KnownChainIds.MegaEthMainnet]: viemMegaEthClient,
[KnownChainIds.KatanaMainnet]: viemKatanaClient,
[KnownChainIds.SeiMainnet]: viemSeiClient,
}

export const viemNetworkIdByChainId: Record<ChainId, number> = {
Expand All @@ -147,6 +154,7 @@ export const viemNetworkIdByChainId: Record<ChainId, number> = {
[KnownChainIds.PlasmaMainnet]: plasma.id,
[KnownChainIds.MegaEthMainnet]: megaeth.id,
[KnownChainIds.KatanaMainnet]: katana.id,
[KnownChainIds.SeiMainnet]: sei.id,
}

export const viemClientByNetworkId: Record<number, PublicClient> = {
Expand All @@ -163,6 +171,7 @@ export const viemClientByNetworkId: Record<number, PublicClient> = {
[plasma.id]: viemPlasmaClient,
[megaeth.id]: viemMegaEthClient,
[katana.id]: viemKatanaClient,
[sei.id]: viemSeiClient,
}

export const assertGetViemClient = (chainId: ChainId): PublicClient => {
Expand Down
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