How I Built PromptBank: The AI-Powered Bank That Lets You Yell at Your Money (And It Listens)
Hey there, fellow tech enthusiasts, frustrated bankers, and anyone who's ever screamed at a frozen ATM screen. I'm the guy behind PromptBank, a wild project that's basically what happens when you mash up ChatGPT, a blockchain wallet, and your grandma's piggy bank. Imagine a bank where you don't need an app, a PIN pad, or even pants (okay, maybe pants are still recommended). You just type (or speak) a prompt like "Yo bank, transfer $50 to my buddy for that pizza I owe him," and boom—it happens. Securely, fraud-free, and with a dash of DeFi magic. If you're a hiring manager at a fintech startup or xAI, keep reading; this project's my love letter to innovative engineering, and I'd love to bring that energy to your team.
Let me back up. It all started when I got tired of traditional banking apps that feel like they're designed by sadistic puzzle masters. "Enter your 16-digit code, wait for SMS, spin three times, and pray to the fintech gods." Nah, dude. As a prompt engineer with a background in n8n automations and AI workflows (I've built helpdesk bots, job app agents, and even architectural rendering pipelines), I thought: Why not make banking as easy as chatting? Enter PromptBank—the all-AI bank where prompts rule everything. 
The Core Idea: Banking on Prompts
At its heart, PromptBank is a fully AI-driven bank where every action—from checking balances to international transfers—is done via natural language. No menus, no buttons, just "Hey Grok, show my spending on coffee this month" (shoutout to xAI for inspiration). The AI agent (built with Grok-like reasoning) parses your intent, extracts details (amounts, accounts, payees), and executes. But here's the funny part: I made it so smart that if you say "Send $20 to Alice for that awkward date," it logs it under "Entertainment" category. Because, let's be honest, that's what it was.
To make it work, I used a session-based authentication system—log in once with your UserID and password, and you're good for 30 minutes (or until you "logout" like a responsible adult). No re-entering creds every prompt; that's annoying, right? And for roles, clients can only mess with their own money (no peeking at Bob's beer fund), while managers get a god-mode chat for overseeing the whole bank—approving loans, viewing audits, or even creating accounts.
Security: Because Hackers Are the Real Villains
Now, security isn't sexy, but in banking, it's everything. I didn't skimp here. Every transaction goes through a dual logging system: one for financial records (transactions entity) and one for audits (every single action, from logins to "oops, insufficient funds"). Think of it as a black box recorder for your money—complete traceability.
But the real hero is the Fraud Detection AI Agent Tool, a custom AI I built as a gatekeeper. No transaction happens without it scanning for red flags: unusual amounts, weird timing, new payees. It scores risks (low/medium/high) and explains like "Dude, $500 at 2AM to a sketchy wallet? That's sus—confirm or cancel?" If high risk, it blocks and alerts. I even made it explainable AI, so users know why, building trust. Funny story: During testing, it flagged my own "buy 100 coffees" prompt as fraud. Turns out, my caffeine addiction looks suspicious.
For extra layers, I integrated Cloudflare for DDoS protection, WAF rules to block injections, and bot management—because no one wants a robot army stealing your crypto. And speaking of crypto...
DeFi and Blockchain: The Futuristic Twist
To make PromptBank "Web3-native," I added hybrid fiat-crypto ops. "Convert $100 to ETH and stake it" – the AI handles conversions with Chainlink oracles for real-time prices, executes on Ethereum Sepolia testnet (via Web3.js and Infura), and logs the on-chain hash in your off-chain records. No real money in demos, of course—safety first. 
The unique bit? AI-optimized DeFi suggestions. The agent analyzes your transaction history to build a risk profile (conservative saver? Aggressive trader?) and suggests stuff like "Based on your low-risk vibe, auto-stake in a stablecoin pool for 5% APY?" It's like having a robo-advisor that's actually fun and not pushy. I tied it into n8n workflows for automation, making it scalable.
Multi-Modal Magic: Talk, Snap, Bank
Because typing is so 2023, I added voice banking (speech-to-text for commands) and image uploads (snap a check, "Deposit this $100"). The AI parses voice with recovery ("Did you say $50 or $15?") and OCRs images for details, all while running fraud checks. It's inclusive—great for visually impaired users—and funny when it mishears "transfer to Alice" as "transfer to Dallas." (Yes, that happened in testing.)
Why This Project Screams "Hire Me"
Look, I'm not just throwing code at walls. As a prompt engineer, I crafted the AI agent to be smart, human-like (with witty responses), and secure. Using n8n for backend automations, Cloudflare for ironclad protection, and blockchain for DeFi, PromptBank isn't a toy—it's a proof-of-concept for the future of banking. It's open-source on GitHub (with a README explaining no-real-funds demos), and I've tested it with simulated attacks (Cloudflare blocked 'em all).
If you're building fintech at xAI, Coinbase, or anywhere, imagine what I could do for your team: AI agents that scale, integrate DeFi securely, and make users laugh while keeping hackers crying. Let's chat—I promise not to make you authenticate every message.
What do you think? Ready to bank on AI? Reach out if you need a demo
