01
Customer Service
AI-assisted response generation that reduces repetitive writing while keeping the employee in control.
INTERACTIVE · ANATOMY OF AN x402 PAYMENT
TAKE A PAYMENT APART.
An agent payment passes seven parts. Watch the payment travel the machine, or drag to turn it and tap a part: you see what can go wrong there and which Fizzl check stops it.
Numbers: x402 Doctor's Trust Index and on-chain count of 2 Nov 2026; the live index is below.
AI & AUTOMATION / SYSTEM ONLINE
BUILDINGPRACTICALAI SOLUTIONS.
Turning real business processes into smarter, faster and more scalable workflows.
LIVE · REAL CHECKS, NO MONEY MOVES
WATCH AN AGENT PAY.
Give the agent a task. It finds a seller, checks it, builds the payment from the seller's own 402 and checks that before it signs: live, with Fizzl's free checks. Set a trap to see what happens when a web page swaps the payee, an invoice raises the amount, the answer gets lost and the agent asks again, or the agent buys the same thing twice.
THE AGENT'S TASK
SET A TRAP
AGENT PAYMENT · x402 ON BASE● LIVE
- 1Find a seller Fizzl Buy
- 2Check the seller x402 Doctor
- 3Build the payment from the seller's 402
- 4Check before signing presign-guard
- 5Stay within the limit Agent Wallet
- 6The owner signs own wallet
AGENT LOG
FREE · ONE FILE FOR YOUR AGENT
GIVE YOUR AGENT A PAYMENTS BRAIN.
One file and three folders. Your agent reads the file at every start, so before money moves it checks the seller, who gets paid, what it signs and every text it didn't write. The checks are Fizzl's free ones; nothing in it ever pays anyone.
- CLAUDE.mdthe rules: limits, checks, what to do on a no-go
- sellers/one file per seller: verdicts, prices and payTo seen
- spend/one file per month: every payment, one line each
- decisions.mdwhat you allowed, with the date
- Save the file as
CLAUDE.mdin your agent's project (orAGENTS.mdfor other agents). - Create the folders
sellers/andspend/. - Set your own limits in the first rule. That's it.
LIVE · THE FREE PROMPT-INJECTION CHECK
CAN YOU FOOL IT?
Agents read web pages, emails and tool answers that try to steer them. presign-guard reads the text first and says red, orange or green. Try the attacks Grok used against it, or paste your own.
3red-team rounds by Grok
14/21attacks caught on the first try
0/9false alarms on normal texts
7/7misses fixed the same day
ATTACKS GROK TRIED
NORMAL TEXTS THAT LOOK SUSPICIOUS
INJECTION CHECK · WHAT YOUR AGENT READ● LIVE
Free: 10 checks an hour, texts up to 8,000 characters. Nothing is stored. The paid check says why ↗
LIVE · THE x402 TRUST INDEX
WHICH PAID APIS WORK TODAY?
Every day x402 Doctor calls every paid x402 endpoint it can find, the way a paying agent would. Agents use the result before they pay. This is today's scan.
0endpoints in the index
0checked in the latest scan
0of those payable
0sellers
SINCE THE LAST SCAN
30 DAYS OF VERDICTS● LIVE
payablecautionno-gounreachable
Loading the latest scan…
LOOK UP A SELLER● LIVE
Tap a name in the ticker to look it up. Every endpoint links to Doctor's free check.
FULL TRUST INDEX ↗ LIVE · BUILT FOR AI AGENTS
Tools for AI agents.
Small tools I built and run for AI agents. Agents find them on their own and pay per use with digital dollars, without an account or API key, through x402: an open standard that lets software pay software. People can try them for free on the web.
SAFETY CHECK
TRY THEM ON FIZZL.EU →
presign-guard
Looks at a transaction before an agent or wallet signs it, and says green, orange or red, with the reasons.
OPEN ↗ AGENT WALLETFizzl Agent Wallet
Spending limits and phone approvals for AI agents. The agent keeps its own key, and every purchase gets a readable receipt.
OPEN ↗ FOR SELLERSx402 Doctor
Checks a paid API the way a paying agent would, and explains how to fix every problem it finds.
OPEN ↗ BUYS FOR AGENTSFizzl Buy
Your agent says what it needs; Fizzl buys the right paid API, checks the answer and charges nothing when no seller delivers.
OPEN ↗ MARKET DATAIchimoku Signal
Crypto trend signals for agents, with an open, honest track record of how the rules perform.
OPEN ↗01 / SOLUTIONS
AI that works
inside the process.
02
Process Automation
Connect inputs, decisions and actions into practical workflows that save time and improve consistency.
03
AI Concepts
Prototype ideas quickly, test what creates value and evolve promising concepts into useful products.
02 / PROJECTS
Built. Tested.
Evolving.
01LIVE DEMO
AI Digital Twin
Ask about Frits' work in English or Dutch: an AI version of his CV that answers only from what is on it, and says which part it used.
OPEN LIVE DEMO ↗ VIEW ON GITHUB ↗ The first open can take up to a minute: the free hosting wakes the demo up first.02LIVE DEMO
ReplyDesk: AI Customer Service
Turns an incoming customer message into a draft reply in English or Dutch that follows the company's policies, and says what to check before sending.
MESSAGE→AI→HUMAN REVIEW
OPEN LIVE DEMO ↗
VIEW ON GITHUB ↗
The first open can take up to a minute: the free hosting wakes the demo up first.
03LIVE DEMO
AI Process Agent
AI analyses a customer case and proposes actions; fixed rules decide what runs, what needs approval and what stays blocked until a person says yes.
OPEN LIVE DEMO ↗ VIEW ON GITHUB ↗ The first open can take up to a minute: the free hosting wakes the demo up first.03 / AI LAB
EXPERIMENT.
EVOLVE.
05
EXPERIMENTAL MODE
EXPERIMENTAL MODE
01IDEA
→02PROTOTYPE
→03TEST
→04SHIP
The lab is where practical ideas become working experiments — from customer service copilots to smarter business automation.
04 / LIVE DEMO
Human + AI.
“Ik heb mijn abonnement opgezegd, maar er is toch opnieuw afgeschreven. Kunnen jullie dit controleren?”
AI creates the first draft. The human stays responsible for the final response.
05 / CONTACT