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x402 Doctor – Batch Preflight Safety Check
x402
x402 Doctor – Batch Preflight Safety Check is a paid API for AI agents from x402-doctor.fizzl.eu, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-13).
Checks up to 10 x402 payment endpoints in a single call and returns a go/caution/no_go safety verdict, recommended payment option, and batch totals for each
Price / call$0.005
Success—
StatusUnknown
How this service works
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 services. Never pays the endpoints.
Output
Returns a structured batch report containing: total count of checked endpoints; aggregate counts of go, caution, no_go, and unknown verdicts; and per-endpoint objects each with the URL, verdict enum, safe_to_pay boolean, recommended payment option index, array of reasons, and a human-readable summary. Also includes a checked_at ISO timestamp.
Example use cases
Marketplace vetting pipeline for x402 services
“I'm building a marketplace listing x402 APIs — before publishing, can you preflight-check these five endpoints to see which are safe to pay, which need caution, and which to reject outright: https://svc1.example.com/api, https://svc2.example.com/query, https://svc3.example.com/generate, https://svc4.example.com/analyze, https://svc5.example.com/fetch?”
Agent workflow pre-payment safety screen
“My AI agent is about to choose between these four x402 data services to call — can you run a batch preflight on https://weather.example.com/now, https://news.example.com/headlines, https://stocks.example.com/price, and https://maps.example.com/route with a max spend of $0.05 each, so I know which ones are actually safe to pay before the agent proceeds?”
Budget-aware network-specific vendor selection
“I want to use base-mainnet for payments and my budget is $0.02 per call — can you check these six x402 endpoints and tell me which ones get a go verdict within that budget: https://a.vendor.com/v1, https://b.vendor.com/v1, https://c.vendor.com/v1, https://d.vendor.com/v1, https://e.vendor.com/v1, https://f.vendor.com/v1?”
Technical details
Endpoint
GEThttps://x402-doctor.fizzl.eu/api/v1/preflight/batch?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to evaluate multiple x402 payment endpoints simultaneously before committing any funds — ideal for marketplaces, agent orchestrators, or any workflow where several competing x402 services must be ranked or filtered. Prefer this over the single-URL check when you have 2–10 candidates and want batch totals and comparative verdicts in one round-trip. Choose the richer 'full diagnosis' sibling endpoint only when you need deep debugging detail on a single failing endpoint.
Side effects
- URL array exceeds 10 items — request rejected
- Unreachable endpoint URLs return unknown verdict with an error field
- Invalid CAIP-2 network string may cause network-level filtering to fail
- Endpoints that return non-standard x402 headers may get caution or unknown verdicts
- Budget string malformed — may default to no budget filtering
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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