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Vokko Pay-Preflight Host Probe
x402
Vokko Pay-Preflight Host Probe is a paid API for AI agents from www.vokko.eu, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-31).
Check whether a given domain accepts agent payments by probing it for x402 and other agent payment rails, returning payment readiness and endpoint details.
Price / call$0.001
Success—
StatusUnknown
How this service works
Probe a host for UCP, ACP, AP2, TAP, MCP, A2A, x402, MPP, llms.txt and OpenAPI. UCP is one cell — not the product.
Output
Returns a JSON object with the queried domain, its detected payment intent, and an 'acceptsAgentPayments' field indicating whether the host supports agent payment protocols (e.g. x402). May include details on which rails or endpoints were detected.
Example use cases
Vetting a merchant before autonomous purchase
“Before my agent tries to buy something from shopify.com on my behalf, check whether it actually supports agent payment protocols so we don't waste a transaction attempt.”
Comparing payment readiness across sites
“I'm building an agent that shops across multiple sites — can you check if etsy.com accepts x402 or any agent-payment rails?”
Debugging a failed agent payment
“My agent tried to pay at api.openai.com and failed — can you run a pay-preflight check on that domain to see what payment protocols it actually exposes?”
Technical details
Endpoint
GEThttps://www.vokko.eu/api/v1/hosts/%7Bdomain%7D/pay-preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when an AI agent needs to determine before attempting a payment whether a given host supports agent-native payment protocols like x402. It is preferable over attempting a live payment blindly, and more efficient than manually inspecting a site's headers or documentation. Best for pre-flight validation in autonomous shopping, API access, or agent-to-merchant workflows.
Side effects
- Domain not resolvable or unreachable — returns unknown or error status
- Domain exists but exposes no payment protocol signals — acceptsAgentPayments: 'unknown'
- Rate limiting or network timeout during probe
- Malformed domain input returns a validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"domain": "example.com",
"intent": "any",
"acceptsAgentPayments": "unknown"
}
}Tags
x402
Reviews
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Zero review prompt (fires after every successful call)
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