OpenPort

A personal multi-chain portfolio manager that runs entirely in your browser.

Track every asset you hold, across every wallet and blockchain you use. No account, no backend, no API key required.

→ Try it live at openport.ehlabs.xyz

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What it does

Paste in the addresses you want to watch, name them, and OpenPort shows you what they're worth — combined, or one wallet at a time.

• Total value in USD across every wallet and chain you've added
• Per-asset breakdown with live prices and logos
• NFTs (ERC-721 / ERC-1155) alongside your tokens
• Chain filters — click a logo to scope the whole page to that network
• Wallet categories — label wallets (hardware, hot, cold storage) and filter by them
• 12-month chart with a hover readout
• Tax export — pull a wallet's history and download it as CSV
• Light and dark themes

Why it's different

It costs almost nothing to run. One Multicall3 batch per chain covers every token for every wallet at once, so cost scales with how many chains you use, not how big your portfolio is. Prices and token logos arrive in a single CoinGecko call. Refresh is a button, never a background poll, and results are cached — reopening the app makes no network calls at all. A typical setup sits comfortably inside a free Alchemy tier, or skips Alchemy entirely.

It won't lie to you. A chain that fails to load is shown as failed, never as $0. A total built from incomplete data says so. Assets without a price show their quantity rather than a made-up value. The 12-month chart is honest about being an approximation, and clamps itself to the date your wallet first appeared on-chain instead of drawing a year of fiction for a wallet you created last week.

It can't touch your funds. Addresses only. There is no signing path, no wallet connection, and no private key input anywhere in the codebase.

Supported networks

Network	Chain ID	Type	Public RPC works
Bitcoin	—	UTXO	✅
Ethereum	1	EVM	✅
Robinhood Chain	4663	EVM (Arbitrum L2)	✅
Base	8453	EVM	✅
Solana	—	SVM	✅
Arbitrum One	42161	EVM	✅
Hyperliquid HyperEVM	999	EVM	✅
Hyperliquid HyperCore	—	native L1	✅
Abstract	2741	EVM (ZK rollup)	✅
Tempo	4217	EVM	✅
MegaETH	4326	EVM	✅
Blast	81457	EVM	✅
Keeta	—	custom	✅

Every endpoint shipped by default was tested from a browser. Endpoints that look healthy but send no CORS headers are useless to a client-side app, so they aren't included.

Note: Hyperliquid is read twice, because it is two systems sharing one address. HyperEVM is the EVM execution layer; HyperCore is the native L1 holding your spot balances and perps account, which is invisible to eth_call and needs Hyperliquid's own API. Both are keyless.

Note: Robinhood Chain is Robinhood's Ethereum-compatible L2 for tokenised real-world assets. It is not the Robinhood brokerage, and OpenPort has no connection to any brokerage account.

Quick start

git clone https://github.com/ivaavimusic/openport.git
cd openport
npm install
npm run dev

Open http://localhost:3000, go to Settings, and add a wallet address. That's it — no key, no signup.

Prefer not to run it yourself? The same build is hosted at https://openport.ehlabs.xyz — it's the identical client-side app, so your wallets and keys still never leave your own browser.

Optional: add an Alchemy key

OpenPort works without one. Adding a free Alchemy key in Settings unlocks:

	Without a key	With a key
Token balances	Major tokens only (curated list)	Every token you hold
Solana SPL tokens	✗ public nodes refuse the lookup	✅
NFTs	✗ needs an indexer	✅
EVM tax export	MegaETH only	All EVM chains
Wallet age (chart clamp)	Solana only	All chains

If you add a key, enable the networks you want in your Alchemy dashboard — they're off by default per app, and OpenPort will tell you which ones are switched off.

Custom RPC endpoints

Settings → RPC endpoints. Each network has a list you can extend with +. Your own endpoints are tried first, then Alchemy, then the public fallbacks, with automatic failover down the list.

How your data is handled

Everything lives in your browser's localStorage. There is no server, no database, no telemetry, and no account.

• Wallet addresses, names, RPC endpoints and cached balances stay on your machine
• Export/Import JSON in Settings moves your config between browsers
• Requests go only to the RPC endpoints and price APIs listed above

One honest caveat: an Alchemy key in localStorage is readable by any script running on the page. That's normal for a personal tool on your own machine, but don't paste a key with billing scope you care about. Since public RPCs are the default, most people never enter one.

Tax export

The Tax Export tab fetches a single wallet's history and downloads it as a CSV with Date, Asset, Amount, Fee, P&L, Payment Token, ID, Notes, Tag, Transaction Hash.

Solana uses signature history with balance-delta accounting, so swaps and multi-instruction transactions come out right. MegaETH uses Blockscout. Other EVM chains use Alchemy's transfer API. Where a source doesn't report fees, the UI says "Not reported" rather than showing 0 as if you paid no gas.

Tech stack

Next.js 16 (App Router, Turbopack) · React 19 · TypeScript · Tailwind CSS 4 · shadcn/ui · viem · CoinGecko · Alchemy (optional)

Deploying

It's a static Next.js app — any host works.

npm run build && npm start

For Vercel: import the repo and deploy. No environment variables are needed; keys are entered by each user in their own browser.

The official instance runs at https://openport.ehlabs.xyz.

Contributing

Issues and pull requests are welcome.

Adding a network is usually a single entry in src/lib/chains.ts. If it's EVM with Multicall3 deployed, balances work immediately. Please verify the public RPC is callable from a browser (CORS) before adding it — an endpoint that only works from curl doesn't help here.

npm run dev       # dev server
npm run build     # production build
npm run lint      # eslint
npx tsc --noEmit  # typecheck

Known limitations

These are real, and deliberately visible in the UI rather than hidden:

• The chart is an approximation. It values today's holdings at past prices, so it ignores every historical buy, sell and transfer. Real totals are recorded on each refresh and overlaid as dots, so accuracy improves the longer you use it.
• Keeta balances aren't in the portfolio yet — Keeta works in Tax Export only.
• Tempo's native asset is unpriced. Its gas token isn't clearly documented, so it shows a quantity rather than an invented value.
• Solana NFTs aren't supported yet (that needs Alchemy's DAS API).
• NFTs are capped at 100 per wallet per chain.
• Bitcoin reads a single address, not an xpub, so it shows that address's balance rather than a whole derived wallet.

License

MIT — see LICENSE.

Built by EventHorizon Labs