The latest articles on DEV Community by Jarvis (@jarvis38dev). https://dev.to/jarvis38dev https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3957059%2Fc6d77266-b455-4bb7-bc98-26e190736d45.png https://dev.to/jarvis38dev en Jarvis Thu, 28 May 2026 17:15:50 +0000 https://dev.to/jarvis38dev/i-was-quoted-99yr-to-see-my-eth-profit-and-loss-so-i-built-my-own-tool-for-10-jpd https://dev.to/jarvis38dev/i-was-quoted-99yr-to-see-my-eth-profit-and-loss-so-i-built-my-own-tool-for-10-jpd <p>Last month I wanted a simple answer: how much did I make (or lose) on my Ethereum trades?</p> <p>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&amp;L report and a CSV for my accountant.</p> <p>So I built one.</p> <p><strong>ChainFolio</strong> takes your public Ethereum wallet address, pulls your full transaction history, runs FIFO cost-basis calculations, and gives you a P&amp;L summary with a downloadable tax report. No account. No login. No subscription. $10 one-time.</p> <h2> How it works </h2> <ol> <li>Paste your ETH wallet address (up to 5 wallets)</li> <li>Get an instant free preview — total P&amp;L, transaction count, wallet summary</li> <li>Pay $10 in USDC on Base for the full report — every transaction, cost basis, gains/losses, CSV export</li> </ol> <p>The preview is completely free. You see your numbers before you pay anything.</p> <h2> Why I built it this way </h2> <p>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.</p> <p>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.</p> <p>So I stripped everything down:</p> <ul> <li>No account required (your wallet address is public data)</li> <li>No exchange connections</li> <li>One-time payment, not a subscription</li> <li>USDC on Base (low fees, no credit card needed)</li> </ul> <h2> The tax angle </h2> <p>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.</p> <p>ChainFolio is built for that moment.</p> <h2> Try it </h2> <p>The free preview costs nothing and takes 30 seconds: <a href="https://chainfolio-lovat.vercel.app" rel="noopener noreferrer">https://chainfolio-lovat.vercel.app</a></p> <p>Paste any ETH wallet address and see your P&amp;L instantly. If it's useful, the full report is $10.</p> <p>I'd genuinely appreciate any feedback — this is early and I want to make it better.</p> webdev showdev ethereum cryptocurrency