feat!: limit Sei chain support to mainnet and testnet (#328)

* feat(precompiles): export Sei chain definitions

Expose canonical Viem mainnet and testnet chains plus a stable devnet definition through the package's public entrypoints.

Co-authored-by: Cursor <cursoragent@cursor.com>

* feat!: remove Sei devnet support

Limit public chain configuration to mainnet and testnet, and update Viem to the supported baseline.

Co-authored-by: Cursor <cursoragent@cursor.com>

* fix: harden supported network configuration

Mark the Viem peer-floor change as major and derive registry filtering from the shared chain ID map.

Co-authored-by: Cursor <cursoragent@cursor.com>

---------

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: alexander-sei

.changeset/migrate-monorepo-to-bun.md

@@ -10,4 +10,4 @@ Migrate the monorepo to Bun and publish ESM-only packages.
 
 **Breaking:** all packages drop CommonJS (`require`) entry points and flatten `dist/`. Consumers must use ESM `import`. `@sei-js/precompiles` now ships an `exports` map with working `./ethers`, `./viem`, and `./precompiles` subpaths. `@sei-js/sei-global-wallet` keeps the `./solana` entrypoint.
 
-Install, build, and test with Bun (`bun install`, `bun run build`, `bun run test`). `@sei-js/mcp-server` now requires Node.js 20 or newer. The MCP server and precompiles development toolchain pin Viem to `2.37.2`, the last compatible release that includes `seiDevnet`. Generated apps target the new `@sei-js/precompiles` major. Packages continue to publish to npm via Changesets.
+Install, build, and test with Bun (`bun install`, `bun run build`, `bun run test`). `@sei-js/mcp-server` now requires Node.js 20 or newer. The MCP server and precompiles development toolchain use Viem 2.55.16. Generated apps target the new `@sei-js/precompiles` major. Packages continue to publish to npm via Changesets.

.changeset/restore-sei-chain-exports.md

@@ -0,0 +1,5 @@
+---
+'@sei-js/precompiles': major
+---
+
+Export Viem's canonical Sei mainnet and testnet definitions from the package root and `viem` entrypoint. Viem 2.55.16 or newer is now required.

.changeset/retire-arctic-network.md

@@ -0,0 +1,6 @@
+---
+'@sei-js/mcp-server': major
+'@sei-js/registry': major
+---
+
+Remove Sei devnet support. The MCP server no longer accepts `sei-devnet`, chain ID `713715`, or `DEVNET_RPC_URL`. Registry exports now contain only `pacific-1` and `atlantic-2`, and `CHAIN_IDS.devnet` has been removed.

REVIEW.md

@@ -32,8 +32,8 @@ invariants are load-bearing and are enforced in code rather than by convention:
 Beyond those, scrutinise anything that widens what a caller controls: contract
 ABIs reach `JSON.parse` from tool arguments in `src/core/tools.ts`, addresses
 and call arguments arrive unvalidated from the model, and RPC endpoints are
-overridable through `MAINNET_RPC_URL` / `TESTNET_RPC_URL` / `DEVNET_RPC_URL` in
-`src/core/chains.ts`. Private keys are read from the environment in
+overridable through `MAINNET_RPC_URL` / `TESTNET_RPC_URL` in `src/core/chains.ts`.
+Private keys are read from the environment in
 `src/core/config.ts` and must never reach a log line, an error message, or a
 tool response.
 

bun.lock

@@ -1,5 +1,5 @@
 # Chain configuration
-# Options: mainnet, testnet, devnet
+# Options: mainnet, testnet
 # Defaults to mainnet if not set; this example overrides it to testnet
 NEXT_PUBLIC_CHAIN=testnet
 

packages/create-sei/templates/next-template/.env.example

@@ -34,9 +34,9 @@ In addition, this app uses [RainbowKit](https://www.rainbowkit.com/docs/wallet-b
 To change the list of supported wallets, as well as connection configurations you can modify the `src/app/components/Web3Provider.tsx` component.
 
 ### Changing the Chain
-This application connects to the arctic-1 devnet by default, using chain configurations uploaded to viem.
+This application connects to Sei mainnet by default.
 
-To change the chain the app connects to, edit the `selectedChain` variable in the `chain.ts` file in `src/app/constants`
+Set `NEXT_PUBLIC_CHAIN=testnet` in `.env.local` to use Sei testnet. The chain selection logic is in `src/components/providers/providers.tsx`.
 
 ## Learn More
 

packages/create-sei/templates/next-template/README.md

@@ -109,8 +109,7 @@ export default function DevelopmentPage() {
 								<Code block>
 									{`# .env.local
 NEXT_PUBLIC_CHAIN=mainnet    # Default: Sei Pacific-1
-# NEXT_PUBLIC_CHAIN=testnet  # Sei Atlantic-2  
-# NEXT_PUBLIC_CHAIN=devnet   # Sei Devnet`}
+# NEXT_PUBLIC_CHAIN=testnet  # Sei Atlantic-2`}
 								</Code>
 							</Paper>
 							<Text size="sm" c="gray.6">

packages/create-sei/templates/next-template/src/app/development/page.tsx

@@ -9,27 +9,8 @@ import { type ReactNode, useMemo } from "react";
 import { createConfig, http, WagmiProvider } from "wagmi";
 
 import "@rainbow-me/rainbowkit/styles.css";
-import { defineChain } from "viem";
 import { sei, seiTestnet } from "viem/chains";
 
-const seiDevnet = defineChain({
-	id: 713715,
-	name: "Sei Devnet",
-	nativeCurrency: { name: "Sei", symbol: "SEI", decimals: 18 },
-	rpcUrls: {
-		default: {
-			http: ["https://evm-rpc-arctic-1.sei-apis.com"],
-		},
-	},
-	blockExplorers: {
-		default: {
-			name: "Seitrace",
-			url: "https://seitrace.com",
-		},
-	},
-	testnet: true,
-});
-
 const queryClient = new QueryClient();
 
 const connectors = connectorsForWallets(
@@ -56,8 +37,6 @@ export default function Providers({ children }: ProvidersProps) {
 		switch (chainName.toLowerCase()) {
 			case "testnet":
 				return seiTestnet;
-			case "devnet":
-				return seiDevnet;
 			default:
 				return sei;
 		}
@@ -73,7 +52,6 @@ export default function Providers({ children }: ProvidersProps) {
 				transports: {
 					[sei.id]: http(),
 					[seiTestnet.id]: http(),
-					[seiDevnet.id]: http(),
 				},
 				ssr: true,
 			}),

packages/create-sei/templates/next-template/src/components/providers/providers.tsx

@@ -21,4 +21,3 @@ SERVER_PATH=/mcp
 # Optional, only needed if you want to use a custom RPC URL
 MAINNET_RPC_URL=your_mainnet_rpc_url_here
 TESTNET_RPC_URL=your_testnet_rpc_url_here
-DEVNET_RPC_URL=your_devnet_rpc_url_here