The latest articles on DEV Community by wiesiek karpinskoi (@freedom_dev). https://dev.to/freedom_dev 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%2F3929915%2Fc48c03c7-5e57-47e0-a5f8-6b1ad400f059.png https://dev.to/freedom_dev en wiesiek karpinskoi Wed, 13 May 2026 18:48:35 +0000 https://dev.to/freedom_dev/i-built-defi-contracts-as-portable-sealed-js-files-no-blockchain-require-527c https://dev.to/freedom_dev/i-built-defi-contracts-as-portable-sealed-js-files-no-blockchain-require-527c <h2> The problem I wanted to solve </h2> <p>Every DeFi tool I found required: a wallet, gas fees, a specific<br> blockchain, and trusting someone else's infrastructure.</p> <p>I wanted something different — a contract you own completely.<br> One file, runs locally, no permissions needed.</p> <h2> What I built </h2> <p><strong>AiDEFi</strong> forges self-contained DeFi contracts as single <code>.js</code> files.<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>node my-dex.aico.js call listPools node my-dex.aico.js call swap ETH USDC 1.5 0 node my-wallet.aico.js call send 0xRecipient 100 </code></pre> </div> <p>No blockchain. No gas. Runs anywhere Node.js runs.</p> <h2> The core concept: Freedom Computer Contract </h2> <p>Each generated file has three properties:</p> <p><strong>1. Cryptographic seal (SHA-256)</strong><br> The file contains a <code>SEAL</code> field — a hash of its own source.<br> Any modification invalidates the seal. The network layer<br> verifies it on every write.</p> <p><strong>2. Local state</strong><br> All data lives in <code>.state.json</code> on your machine.<br> You control the file, you control the data.</p> <p><strong>3. Zero external dependencies</strong><br> One CJS bundle. Copy it to a USB drive, run it offline.</p> <h2> 20 contract templates </h2> <p>TOKEN, VAULT, DEX, LOAN, STAKING, NFT, WALLET, CASINO,<br> FOREX, SYNTH, LEND, MULTISIG, ESCROW, ORACLE, and more.</p> <p>The DEX supports up to 8 independent x*y=k pools per contract<br> plus flash loans. The WALLET generates a real secp256k1 EVM<br> keypair — works on Ethereum, Polygon, BSC, Arbitrum.</p> <h2> The Dream parser </h2> <p>This is the part I find most interesting. You describe what<br> you want in plain English:</p> <blockquote> <p>"DEX with ETH/USDC and BTC/USDC pools, 0.3% fee, cyberpunk dashboard"</p> </blockquote> <p>The parser extracts the spec and forges the contract.<br> No Solidity. No Yul. No bytecode.</p> <h2> HTML dashboards </h2> <p>Every contract gets a built-in HTML dashboard served at:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight http"><code><span class="err">GET /contracts/:id/ui </span></code></pre> </div> <p>4 visual styles: cyberpunk, modern, minimal, retro.</p> <h2> Tech stack </h2> <ul> <li>Node.js CJS bundle (contracts)</li> <li>Express 5 + PostgreSQL (API server)</li> <li>React + Vite (frontend)</li> <li>SHA-256 via Node built-in crypto</li> </ul> <h2> Try it </h2> <p><a href="https://de-fi-powerhouse.replit.app/" rel="noopener noreferrer">https://de-fi-powerhouse.replit.app/</a></p> <p>Early access is $10 — I'm at the feedback stage and genuinely<br> want to know what breaks and what's confusing.</p> <p>Happy to answer questions about the architecture in the comments.</p> javascript node defi opensource