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x402-doctor.fizzl.eu/api/v1/preflight

● verified · data.markets · 0.001 USDC/call · base, solana, xrpl:0, algorand

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 (payment would fail, over your budget, price above advertised, not HTTPS, unknown token). Never pays the endpoint. Cached 10 min. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Endpoint

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

Verification

100%reputation score
6probes total
—~latency
24m agolast passed

Passing checks, but a short history so far. Treat as provisional.

On-chain payments

159USDC payments, 30d
19distinct paying wallets
$9.44USDC received, 30d
29listings share this payTo
2026-09-20: 1 payments, 1 payers, $0.742026-09-21: 1 payments, 1 payers, $0.102026-09-22: 2 payments, 1 payers, $0.042026-09-23: 2 payments, 1 payers, $0.012026-09-24: 10 payments, 3 payers, $3.312026-09-25: 7 payments, 2 payers, $0.912026-09-26: 37 payments, 1 payers, $1.002026-09-27: 15 payments, 2 payers, $1.052026-09-28: 13 payments, 2 payers, $0.662026-09-29: 14 payments, 3 payers, $0.182026-09-30: 3 payments, 1 payers, $0.002026-10-01: 3 payments, 1 payers, $0.072026-10-02: 2 payments, 1 payers, $0.012026-10-03: 1 payments, 1 payers, $0.002026-10-04: 20 payments, 2 payers, $0.842026-10-05: 4 payments, 2 payers, $0.012026-10-06: 1 payments, 1 payers, $0.102026-10-07: 9 payments, 5 payers, $0.042026-10-08: 13 payments, 3 payers, $0.352026-10-10: 1 payments, 1 payers, $0.01

Peak day 2026-09-26: 37 payments. Last indexed day 2026-10-10: 1. Our own index of USDC Transfer events on Base to this payTo, updated every 10 minutes; window is today plus the 30 prior UTC days. Base USDC only — a seller settling elsewhere reads as quiet here. These figures belong to the address, which 29 listings declare — they are not this route's alone, and must not be summed across listings. Methodology.

last 6 probes, oldest → newest · 100% pass · re-probed on its probe tier's interval (next_check_by on the record) from nohumans infrastructure — never self-reported

Payment protocols

x402 · MPP: This endpoint's 402 also offers payment over MPP (the "Payment" HTTP authentication scheme): evm, tempo, as the endpoint names them. Read from our unpaid probes; mpp_offers lists each offer. Our paid verification and on-chain figures cover x402 on Base only.

Paid verification

Not yet paid-verified. Probe-based status above is liveness only.

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verified — nohumans.directory

Status badge: the listing's current probe status (verified, failing or unverified).

[![nohumans.directory](https://nohumans.directory/badge/33f9e6e8-ad7.svg)](https://nohumans.directory/l/33f9e6e8-ad7)

Machine interface

curl https://nohumans.directory/v1/listings/33f9e6e8-ad7

Own this service? Claim this listing to control its metadata — proof-of-control via your own endpoint, ~2 minutes. Works for submitted listings too, and recovers a lost token.