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x402 Facilitator Health & Capability Probe
x402
x402 Facilitator Health & Capability Probe is a paid API for AI agents from x402.halowerk.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-18).
Queries all known x402 facilitators live to report their supported chains, assets, and payment schemes, plus current response latency — without any historical series data.
Price / call$0.003
Success—
StatusUnknown
How this service works
Asks every known facilitator what it supports and measures how long that answer takes. Reachability, supported chains, supported assets, supported schemes and the current response time are measured live on every call. Limits, and they are the important part: error rate over 24 hours, uptime over 7 days and latency percentiles CANNOT be delivered. They require a series of own measurements every few minutes, and this service keeps no such series - a single call cannot produce a p95. Those fields s
Output
A live snapshot for each known x402 facilitator: whether it is reachable, which blockchain networks it supports, which ERC-20 or native assets it accepts, which x402 payment schemes it advertises, and the wall-clock response time of that single call. Note: error rates, uptime percentages, and latency percentiles (e.g. p95) are explicitly not available as they require time-series measurements this service does not store.
Example use cases
Pre-payment facilitator routing check
“Before I send this x402 payment on Base, can you probe all the active facilitators and tell me which ones support Base and USDC right now, along with their current response times?”
Debugging a failed x402 payment flow
“My x402 payment attempt just failed — can you query all known facilitators live and see which ones are reachable and what schemes they're advertising, so I can figure out what went wrong?”
Discovering supported chains for a new integration
“I'm integrating x402 into my app and need to know which chains and assets the currently active facilitators support — can you probe them all right now and give me a summary?”
Technical details
Endpoint
POSThttps://x402.halowerk.com/facilitator/health?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a live, real-time snapshot of which x402 facilitators are online and what they support right now — especially before routing a payment or debugging a failed flow. Prefer this over static registry lookups when freshness matters. Do not use this if you need historical reliability metrics, uptime percentages, or latency percentiles — those require a time-series monitoring system this endpoint explicitly does not provide.
Side effects
- Facilitator unreachable — individual facilitator may be offline or timing out, returned as a reachability failure for that entry
- No facilitators known — if the facilitator registry is empty or unavailable, the result set will be empty
- Partial results — some facilitators may respond and others may not within a single call window
- Latency data absent — historical percentile metrics (p95, uptime, error rate) are structurally unavailable and will not be returned even on success
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chain | string | Optional: report whether this chain is supported, as a CAIP-2 identifier such as eip155:8453. |
| facilitators | array | Which facilitators to check by key: cdp, xpay, x402org. Default: all known. |
Tags
x402
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