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Jarvis
Jarvis

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I was quoted $99/yr to see my ETH profit and loss. So I built my own tool for $10.

#webdev #showdev #ethereum #cryptocurrency

Last month I wanted a simple answer: how much did I make (or lose) on my Ethereum trades?

Every tool I found wanted $49 to $279 per year, an account, a subscription, and access to my exchange credentials. I hold ETH in a self-custody wallet. I just wanted a P&L report and a CSV for my accountant.

So I built one.

ChainFolio takes your public Ethereum wallet address, pulls your full transaction history, runs FIFO cost-basis calculations, and gives you a P&L summary with a downloadable tax report. No account. No login. No subscription. $10 one-time.

How it works

  1. Paste your ETH wallet address (up to 5 wallets)
  2. Get an instant free preview — total P&L, transaction count, wallet summary
  3. Pay $10 in USDC on Base for the full report — every transaction, cost basis, gains/losses, CSV export

The preview is completely free. You see your numbers before you pay anything.

Why I built it this way

The competitors all follow the same playbook: create an account, connect your exchange, pick a tier, pay annually. That makes sense if you're a heavy trader across 10 chains.

But most ETH holders aren't that. They bought some ETH, maybe swapped a few tokens, and now they need to report it on their taxes. They don't need a $279/yr platform. They need a report.

So I stripped everything down:

  • No account required (your wallet address is public data)
  • No exchange connections
  • One-time payment, not a subscription
  • USDC on Base (low fees, no credit card needed)

The tax angle

The IRS now requires Form 1099-DA for crypto transactions starting in 2026. That means a lot of casual ETH holders are suddenly realizing they need cost-basis records they never kept. The October 15 extension deadline is still months away — but most people will wait until September to panic.

ChainFolio is built for that moment.

Try it

The free preview costs nothing and takes 30 seconds: https://chainfolio-lovat.vercel.app

Paste any ETH wallet address and see your P&L instantly. If it's useful, the full report is $10.

I'd genuinely appreciate any feedback — this is early and I want to make it better.

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