# Vokko Pay-Preflight Check

> Vokko Pay-Preflight Check is a paid API for AI agents from www.vokko.eu, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-11).

Checks whether an AI agent can complete a payment on a given domain (e.g. allbirds.com), returning payment rails, endpoint details, price, and data freshness.

## Facts

- Endpoint: GET https://www.vokko.eu/api/v1/hosts/:domain/pay-preflight?utm_source=zero.xyz
- Price: $0.001/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vokko-pay-preflight-check-a1589f80
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ys55A6yr6OpZaEFaWZZPl

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vokko-pay-preflight-check-a1589f80
```

Example prompt: Can you check if allbirds.com supports agentic payments — look up what payment rails they use, what the endpoint is, and how recent that data is?

## When to prefer this

Use this endpoint when an AI agent needs to determine upfront whether a given merchant domain supports x402 or agentic payment protocols before attempting a purchase. Prefer it over a live re-probe (sibling endpoint) when cached data is sufficient and you want to avoid the $0.001 cost — the cached GET at /api/v1/hosts/:domain is free. Use this pay-preflight endpoint when you need the structured payment readiness report including rails, endpoint, and price.

## Known failure modes

- Domain not indexed — no preflight data available, returns empty or 404
- Stale cached data — freshness timestamp is outdated but still returned
- Domain is unreachable or does not support any payment rails — report reflects incompatibility
- Invalid domain format — input validation error
- Upstream probe failure — cached data may be returned if live probe fails

## How this service works

Can an agent pay at allbirds.com? Rails, endpoint, price, freshness. $0.001. Cached report stays free at /api/v1/hosts/allbirds.com.

## Output

Returns a structured report indicating whether the target domain supports agentic/x402 payments, including the payment rails available, the payment endpoint URL, the price, and a freshness timestamp indicating when the data was last captured.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object",
     "required": [
      "domain"
     ],
     "properties": {
      "domain": {
       "type": "string",
       "description": "Host to check"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vokko-pay-preflight-check-a1589f80/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from www.vokko.eu](https://www.zero.xyz/host/www.vokko.eu/llms.txt)