Live tools that AI agents find and pay for per call, and AI workflows built around practical business problems.
Four services I built and run. AI agents pay them per call in USDC, with no account and no API key, using the x402 standard.
A green, orange or red verdict before an agent or wallet signs a transaction, approval or signature.
OPEN ↗ FROM $0.001Checks a paid API the way a paying agent would, with a fix for every problem. The web check is free.
OPEN ↗ FROM $0.02Ichimoku Cloud trading signals, price levels and a ranked scan of 148 coins. The daily trend is free.
OPEN ↗ FROM $0.03presign-guard's verdict on a wallet's approvals, explained in plain language: who can move what, and whether to revoke it. 3 free checks a day.
OPEN ↗Four pay-per-call services, built with Claude and Claude Code. AI agents find them in the Coinbase Bazaar and via MCP, and pay per call in USDC on Base or Solana over the x402 protocol. The web versions are free to try.
Checks x402 paid APIs before an agent pays and before a seller ships: a quick go / caution / no-go preflight, batch and deep checks, a full diagnosis with a fix hint per check, and the fix code itself. Scans every endpoint in the Coinbase Bazaar daily.
OPEN X402-DOCTOR.FIZZL.EU ↗Reads a transaction, approval or signature before it is signed and says in plain words what it can move and to whom: green, orange or red. Also token verdicts (honeypots, mint and freeze powers, permissioned tokens) and wallet approval audits.
OPEN PRESIGN-GUARD.FIZZL.EU ↗Ichimoku Cloud signals for AI agents across hundreds of crypto pairs: a per-pair signal with entry, stop and targets, multi-timeframe confluence, key levels, a market scan and ranked setups. With a public paper-trading track record.
OPEN ICHIMOKU-SIGNAL.FIZZL.EU ↗Explains crypto wallet approvals in plain language: checks which token and NFT approvals a wallet has given, and translates a pasted approval or signature into what it lets someone do. The verdicts come from presign-guard (the same checks and a signed receipt); people get 3 free checks a day, agents pay $0.03–$0.04.
OPEN PLAINTEXT.FIZZL.EU ↗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 PROJECT ON GITHUB ↗An AI-assisted customer-service workflow that turns an incoming customer message into a structured, editable draft response using context and business knowledge.
OPEN LIVE DEMO ↗ VIEW PROJECT ON GITHUB ↗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 PROJECT ON GITHUB ↗