Discover / x402-doctor.fizzl.eu

x402 Doctor

■ Challenge detected

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 on chain. Answers with a job id at once; the result is public, usually within 30 minutes. For sellers who want proof, and buyers before a big order.

Listed price
$0.25
Challenge detected
9 of the last 9 checks
Median response
253 ms
Last checked
16 Oct, 13:59 UTC
In our index since
28 Sept 2026

Endpoint

curl -i https://x402-doctor.fizzl.eu/api/v1/delivery-check
# 402 Payment Required: pay with an x402 client (USDC on Algorand),
# then send the same request again with the payment attached.
6 listed endpoints · on x402 Bazaar

Checks and payment terms on this page refer to the endpoint above. Other listed endpoints have not been checked individually.

Base URLhttps://x402-doctor.fizzl.eu/api/v1

  • GET/fixNo price listedHow 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. Bulk: 1000 credits for $0.80 via /api/v1/credits.
  • GET/delivery-checkNo price listedDoes 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 on chain. Answers with a job id at once; the result is public, usually within 30 minutes. For sellers who want proof, and buyers before a big order.
  • GET/preflight/batch$0.005Are 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 services. Never pays the endpoints.
  • GET/preflight/deepNo price listedShould 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 reliable the seller's other endpoints are and whether the endpoint moved domains. Never pays the endpoint. Bulk: 1000 credits for $0.80 via /api/v1/credits.
  • GET/preflightNo price listedIs 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.
  • GET/diagnoseNo price listedWhy 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.

A dash means the listing gives no price or method. Copy buttons copy the full URL.

Showing 6 of 6 listed endpoints.

Agents can find it through the Superstables MCP server and JSON API: GET /api/v1/services/x402-doctor.fizzl.eu

Recent checks

2 Oct 2026One bar per check, showing up to 20 recent checks. Coloured bars show relative response time, with a minimum visible height; full-height grey bars mean no challenge was detected. “Challenge detected” means HTTP 402 or another detected payment-challenge signal.16 Oct 2026
All 9 checks
When (UTC)ResultHTTPResponse
16 Oct, 13:59 UTCChallenge detected402361ms
15 Oct, 08:20 UTCChallenge detected402253ms
13 Oct, 20:45 UTCChallenge detected402337ms
11 Oct, 19:34 UTCChallenge detected402228ms
10 Oct, 03:32 UTCChallenge detected402149ms
9 Oct, 00:47 UTCChallenge detected402128ms
7 Oct, 21:31 UTCChallenge detected402196ms
6 Oct, 21:30 UTCChallenge detected402350ms
2 Oct, 05:04 UTCChallenge detected402393ms

Questions

Did our last probe detect a payment challenge?

At our last probe on 16 Oct, 13:59 UTC, it returned HTTP 402 or another detected payment-challenge signal. This check did not test payment, delivery or compatibility with the Superstables client.

What price is recorded for x402 Doctor?

Its listed price is $0.25.

What payment terms does x402 Doctor advertise?

The listing advertises x402, Algorand, Base, Solana, Xrpl and USDC. It names cdp as its facilitator. Check the seller's current payment challenge and authentication requirements before paying.

Where is x402 Doctor listed?

In x402 Bazaar and x402-list.com. Superstables first indexed it on 28 Sept 2026.

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