fizzl.eu valid
Fizzl
Safety checks for AI agents that pay. Fizzl checks what an agent is about to sign, which paid API it is about to buy from, and what that API sent back. All services are paid per call over x402 (USDC on Base, Solana, Algorand or Stellar, or RLUSD on the XRP Ledger), need no account or API key, and never sign anything for you. Only Fizzl Buy pays anyone: the seller it buys from on your behalf, from its own wallet.
- Authority
- 45 reach 0 · trust 5 · quality 25 · freshness 15
- Tier
- listed
- llms.txt
- https://fizzl.eu/llms.txt
- llms-full.txt
- https://fizzl.eu/llms-full.txt
- Sections
- 11
- Links
- 46
- Size
- 22790 bytes
- Country
- Germany Hosting inference
- Hosting country
- Germany Hosting inference
- Country evidence
- No published address evidence collected yet
- Categories
- AI and machine learning
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-25T04:53:16.695Z
- Last checked
- 2026-10-25T04:53:17.292Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-25T04:53:16.699Z. Cached copy · Source on fizzl.eu
# Fizzl
> Safety checks for AI agents that pay. Fizzl checks what an agent is about to sign, which paid API it is about to buy from, and what that API sent back. All services are paid per call over x402 (USDC on Base, Solana, Algorand or Stellar, or RLUSD on the XRP Ledger), need no account or API key, and never sign anything for you. Only Fizzl Buy pays anyone: the seller it buys from on your behalf, from its own wallet.
Use Fizzl when an agent is about to: sign a transaction, approval or typed-data signature (presign-guard); buy, hold or accept a token (presign-guard); pay an x402 endpoint it has not used before (x402 Doctor); get data or a result it doesn't have from the right paid API, in one call (Fizzl Buy); or let its owner set spending rules and approve payments (Fizzl Agent Wallet).
An agent sent here by its owner can start with the short skill file: https://fizzl.eu/skill.md (which service for which moment, the free tools to try first, how paying works).
This file plus the full text of every Fizzl research article and guide, in one file: https://fizzl.eu/llms-full.txt
## Before signing: presign-guard
Checks a transaction or signature before an agent signs it, on EVM chains, Solana, the XRP Ledger and Algorand. Solana: send `{"type": "solana", "transaction": "<base64>"}` (every instruction decoded, then simulated: token account takeovers, hidden delegates). XRP Ledger: `{"type": "xrpl", "tx": …}` (account takeovers, fake RLUSD, partial payments, DEX offers far below market). Algorand: `{"type": "algorand", "transaction": "<base64 msgpack>"}` or a whole group as `transactions` (rekeys, closing the account or an asset holding to someone else, fake USDC; simulated). Answers green / orange / red with reason codes. Flags signatures that borrow the names of Permit2, Seaport, CoW, UniswapX or 1inch.
- `POST https://presign-guard.fizzl.eu/v1/check` ($0.01): verdict, reason codes and the decoded transaction or signature
- `POST https://presign-guard.fizzl.eu/v1/check/explain` ($0.03): the same plus a plain-language explanation (English or Dutch)
- `GET https://presign-guard.fizzl.eu/v1/token?chain=…&address=…` ($0.01): any red flags on this token, like a honeypot or a rug pull? Solana, EVM chains, Algorand assets (`chain=algorand&address=31566704`) and XRPL tokens (`chain=xrpl&address=RLUSD.rMxCK…`)
- `GET https://presign-guard.fizzl.eu/v1/approvals?chain=…&address=…` ($0.02): every open token approval of a wallet and which ones to revoke
- `GET https://presign-guard.fizzl.eu/v1/screen?address=…` ($0.01): is this wallet sanctioned? Any chain's address (EVM, Solana, Tron, Bitcoin, XRP Ledger, Algorand) against the OFAC SDN list, plus theft and phishing reports for EVM
- `GET https://presign-guard.fizzl.eu/v1/sanctions` (free, open data): every crypto address on the OFAC SDN list with its entry (name, programs, currency), refreshed every 6 hours
- For sellers: [presign-guard-payer-screen](https://www.npmjs.com/package/presign-guard-payer-scr
…Related sites
Similar publisher descriptions and documentation. Similarity does not imply affiliation or equivalent capabilities.
| Domain | Title | Category | Country | Authority | llms.txt | llms-full.txt | Save |
|---|---|---|---|---|---|---|---|
| breakthecubicle.com | Paddock | interface AI and machine learning Finance and payments +1 | US | 46 | ✓ | ✓ | |
| zeroclick.ai | ZeroClick | interface Finance and payments AI agents and MCP +1 | US | 56 | ✓ | ✓ | |
| achivx.com | ACHIVX | documentation Cybersecurity Crypto and Web3 +1 | — | 56 | ✓ | ✓ | |
| nevermined.ai | Nevermined | interface AI agents and MCP Finance and payments +1 | US | 52 | ✓ | ||
| forter.com | Forter — Identity Intelligence for Digital Commerce | interface Ecommerce Cybersecurity +1 | US | 75 | ✓ | ✓ | |
| p402.io | P402.io | interface Finance and payments AI agents and MCP +1 | US | 45 | ✓ | ✓ | |
| craigmbrown.com | Craig Brown — AI Systems Architect & BlindOracle | interface AI agents and MCP Crypto and Web3 +1 | — | 48 | ✓ | ✓ | |
| x402scan.com | x402scan | interface Crypto and Web3 AI agents and MCP | US | 50 | ✓ |
Machine-readable: GET /v1/resolve?q=fizzl.eu · GET /v1/domain/fizzl.eu · this page as Accept: application/json or text/markdown · MCP lookup_domain
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