Sato Hub
x402 merchant

x402-doctor.fizzl.eu

Developer tools API on Stellar, paid per request with x402.

  • Endpoints9
  • Price per requestn/a
  • Outside payersn/a
  • Answer 4021 of 1

Overview

as of 2026-10-20
Seller wallet
GCH2J5UAY24YNKA65MPAATVKWRCZZRZNF3JZKYYS5MIBZPG6U7WJ6CDQ
Chains
Stellar
Hosts
presign-guard.fizzl.eu, x402-doctor.fizzl.eu
CategoriesCategoriesAssigned automatically from the seller’s own listing text. A filter hint, not a claim about the service.
Developer tools4Security4Onchain data1
First seen
2026-10-18 · last seen 2026-10-20

What we observed

Payments unknown, unknownAnswers 402, observedNot claimed
See the readings

Endpoints

EndpointsDescriptions are the seller's own words from the catalogue and are not checked by us. A listed price is a registration, not an observed charge.
9 registered

  • https://presign-guard.fizzl.eu/v1/approvals

    Wallet approval audit (green/orange/red, grade, one-line summary): every open ERC-20 allowance of an EVM wallet with who the spender is (flagged, plain wallet, unverified, unlimited) and which ones to revoke. Bulk: 100 …

    StellarOnchain data

    n/a/ request

    2026-10-19

  • https://presign-guard.fizzl.eu/v1/check

    Is this transaction, approval or signature safe to sign? Check it before your AI agent or wallet signs it: pre-sign verdict (green/orange/red + reason codes) for EVM and Solana transactions, token approvals and Permit/P…

    StellarSecurity

    n/a/ request

    2026-10-19

  • https://presign-guard.fizzl.eu/v1/token

    Is this token safe to buy, or a honeypot or rug pull? Checks a Solana or EVM token before you buy, hold or accept it (mint or freeze authority still active, LP not locked, buy/sell tax, low liquidity, brand-new token, c…

    StellarSecurity

    n/a/ request

    2026-10-19

  • https://x402-doctor.fizzl.eu/api/v1/delivery-check

    Does this x402 endpoint really deliver? x402 Doctor buys it once with the example input its own listing declares (at most $0.1, USDC on Base), checks the answer against the declared output schema and measures the charge…

    StellarDeveloper tools

    n/a/ request

    2026-10-20

  • https://x402-doctor.fizzl.eu/api/v1/diagnose

    Why is my x402 endpoint broken? Diagnose and debug an x402 payment endpoint (or MCP server) when payments fail: checks the 402 challenge, accepts[] (network, payTo, amount, asset), resource URL, Solana settlement readin…

    StellarDeveloper tools

    n/a/ request

    2026-10-19

  • https://x402-doctor.fizzl.eu/api/v1/fix

    How do I fix my broken x402 endpoint? Diagnoses it, then returns per problem the concrete change as code for your stack (Express, Next.js, Hono or raw HTTP), filled in with your own payTo, amount, network and route. Bul…

    StellarDeveloper tools

    n/a/ request

    2026-10-18

  • https://x402-doctor.fizzl.eu/api/v1/preflight

    Is this x402 endpoint safe to pay? Call it before your AI agent pays an endpoint it has not used before. Returns a go / caution / no_go verdict, the recommended payment option (network and amount) and the reasons (payme…

    StellarSecurity

    n/a/ request

    2026-10-20

  • https://x402-doctor.fizzl.eu/api/v1/preflight/batch

    Are these x402 endpoints safe to pay? Up to 10 endpoints in one call (?url=a&url=b): per endpoint go / caution / no_go, the recommended payment option and why, plus totals. For marketplaces and agents that weigh several…

    StellarSecurity

    n/a/ request

    2026-10-20

  • https://x402-doctor.fizzl.eu/api/v1/preflight/deep

    Should my agent pay this expensive x402 endpoint? Call it before a costly or repeated payment. Returns the go / caution / no_go verdict plus the full diagnosis, the endpoint's check history per day over 30 days, how rel…

    StellarDeveloper tools

    n/a/ request

    2026-10-19

Evidence

as of 2026-10-20

Answers HTTP 402

Answers HTTP 402Method: one unpaid request per listed endpoint. A 402 with a payment payload a client could parse counts. Nothing is paid.

1 of 1

1 of 1 probed endpoints answered HTTP 402 with a parseable payment payload

checked 2026-09-28

x402-style payments, last 7 days (Base)

x402-style paymentsMethod: counted when the transaction carries a signed USDC authorization (EIP-3009), the settlement x402's exact scheme uses. Some non-x402 gasless sends use it too.

unknown

unknown. not measured on this chain yet

no reading date

By chain

ChainSeller walletEndpointsAnswers 402x402-style payments
StellarGCH2J5UAY24YNKA65MPAATVKWRCZZRZNF3JZKYYS5MIBZPG6U7WJ6CDQ91 of 1 probed endpoints answered HTTP 402 with a parseable payment payload
2026-09-28
unknown. not measured on this chain yet

One seller wallet, each chain read on its own. We never send a payment, so we never observe what a paid call returns. Unknown means we hold no reading, not that anything failed.

Pricing

Lowest
n/a
per request, as registeredas of
Median
n/a
per request, as registeredas of
Highest
n/a
per request, as registeredas of

Unknown. Prices are decoded only for USDC on Base and Solana.

Claim this merchant

Sign a message from the payout address GCH2J5UA…WJ6CDQ to claim this page. Claiming proves control of the payout key. It says nothing about the service behind the address, and it does not change how this merchant is ranked. No email, no account: the signature is the whole credential, and signing a message costs no gas and moves nothing.

The payment ledger covers Base only for now, so it is not offered for Stellar.

Data CC-BY-4.0, attribution: data by satohub.ai. Data: x402-list.com (CC BY 4.0). Data as of 2026-10-20. Appearing here is not an endorsement. Check an endpoint with the doctor.