The latest articles on DEV Community by damien os (@damien_os_4eef6e9d967e406). https://dev.to/damien_os_4eef6e9d967e406 https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3868859%2F209084f7-088d-48bd-9df9-7436cd9b3443.png https://dev.to/damien_os_4eef6e9d967e406 en damien os Tue, 07 Jul 2026 05:27:24 +0000 https://dev.to/damien_os_4eef6e9d967e406/building-sqlite-x402-gateway-turn-any-sqlite-database-into-a-pay-per-query-api-1amb https://dev.to/damien_os_4eef6e9d967e406/building-sqlite-x402-gateway-turn-any-sqlite-database-into-a-pay-per-query-api-1amb <p>Over the past few days, I've been exploring Coinbase's <strong>x402 protocol</strong> — a simple yet powerful standard for machine-to-machine micro-payments using <strong>HTTP 402 Payment Required</strong>.</p> <p>The result is <strong>SQLite x402 Gateway</strong>, a lightweight open-source tool that lets you transform any existing SQLite database into a monetized API in minutes.</p> <h2> Why This Project? </h2> <p>Most developers already have SQLite databases—whether for personal tools, internal CRMs, product catalogs, research data, or side projects.</p> <p>The idea was to make it trivial to expose this data via an API that can be paid for on a <strong>per-query basis</strong>, especially by autonomous AI agents.</p> <p>No more building custom payment logic or manually creating API routes for every table.</p> <h2> Core Features </h2> <ul> <li> <p><strong>Automatic schema introspection</strong></p> <ul> <li>Scans your SQLite database and generates API routes automatically.</li> </ul> </li> <li> <p><strong>x402 protocol support</strong></p> <ul> <li>Full implementation (simulation + real testnet).</li> </ul> </li> <li> <p><strong>Simulation mode</strong></p> <ul> <li>Test everything locally with zero blockchain setup.</li> </ul> </li> <li> <p><strong>Real testnet mode</strong></p> <ul> <li>One-command setup for Base Sepolia with actual USDC test payments.</li> </ul> </li> <li> <p><strong>Admin dashboard</strong></p> <ul> <li>Track requests, revenue, popular routes, and toggle free mode.</li> </ul> </li> <li> <p><strong>Security-first</strong></p> <ul> <li>Only <code>SELECT</code> queries are allowed by default.</li> </ul> </li> </ul> <h2> How It Works </h2> <h3> 1. Demo / Quick Start </h3> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>npm <span class="nb">install </span>npm start </code></pre> </div> <p>A sample database with fake data is created automatically.</p> <h3> 2. Monetize Your Existing Database </h3> <div class="highlight js-code-highlight"> <pre class="highlight shell"><code>node scripts/monetize.js /path/to/your/database.db </code></pre> </div> <p>The script:</p> <ul> <li>analyzes your tables,</li> <li>suggests pricing based on data volume,</li> <li>updates the configuration automatically.</li> </ul> <h3> 3. Enable Real Payments </h3> <p>Generate a wallet, switch to <strong>real-testnet</strong> mode, and you're ready to receive micro-payments.</p> <h2> Technical Stack </h2> <ul> <li>Node.js</li> <li>Express</li> <li>Native <code>node:sqlite</code> </li> <li>x402 protocol (simulation + real adapter)</li> <li>Simple HTML/JavaScript admin interface</li> </ul> <p>The project is intentionally lightweight (around <strong>70 dependencies</strong> in simulation mode) compared to full blockchain SDKs.</p> <h2> Current Limitations (Transparency First) </h2> <ul> <li>Only <code>SELECT</code> queries are supported for security reasons.</li> <li>Simulation mode is ideal for development but <strong>is not a replacement</strong> for blockchain verification.</li> <li>Mainnet deployments require a proper x402 facilitator and production configuration.</li> </ul> <h2> Future Ideas </h2> <p>I'm considering adding:</p> <ul> <li>Pagination with dynamic pricing</li> <li>Query parameter whitelisting</li> <li>Rate limiting per wallet address</li> <li>Improved analytics</li> <li>Authentication plugins</li> <li>Cached paid queries</li> <li>OpenAPI/Swagger generation</li> </ul> <h2> GitHub Repository </h2> <p>👉 <strong><a href="https://github.com/damienos61/SQLite-x402-Gateway" rel="noopener noreferrer">https://github.com/damienos61/SQLite-x402-Gateway</a></strong></p> <p>If you find the project interesting, feel free to leave a ⭐.</p> <h2> I'd Love Your Feedback </h2> <p>What do you think about this approach?</p> <ul> <li>Would you use something like this in your own projects?</li> <li>What use cases do you see for pay-per-query SQLite APIs?</li> <li>Any security or architecture suggestions?</li> <li>What feature would you add first?</li> </ul> <p>Contributions are welcome—the project is released under the <strong>MIT License</strong>.</p> node web3 ai opensource