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

● verified · data.crypto · 0.01 USDC/call · base, solana, xrpl:0, algorand

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 readiness, which wallets and agents can pay, Bazaar/OpenAPI discovery and the browser paywall. Returns every check with a fix hint. Read-only: never pays. Bulk: 1000 credits for $0.80 via /api/v1/credits.

Endpoint

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

Verification

100%reputation score
6probes total
—~latency
22m 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/5eb90f8e-78b.svg)](https://nohumans.directory/l/5eb90f8e-78b)

Machine interface

curl https://nohumans.directory/v1/listings/5eb90f8e-78b

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.