# Vokko Multi-Protocol Host Probe

> Vokko Multi-Protocol Host Probe is a paid API for AI agents from www.vokko.eu, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-31).

Probes a domain and returns which agent-web protocols (UCP, ACP, AP2, TAP, MCP, A2A, x402, MPP, llms.txt, OpenAPI) are present, absent, or callable

## Facts

- Endpoint: GET https://www.vokko.eu/api/v1/hosts/%7Bdomain%7D?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vokko-multi-protocol-host-probe-fe8fd423
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_hIhqR-76P7GZL7ix9XgI6

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-multi-protocol-host-probe-fe8fd423
```

Example prompt: Probe stripe.com and tell me which agent-web protocols it supports — I want to know if MCP, x402, A2A, or llms.txt are present or callable.

## When to prefer this

Use this endpoint when you need a single call that checks a host against the full spectrum of agent-web protocols simultaneously — rather than querying each protocol endpoint separately or using a cached report endpoint. Prefer this for fresh, live detection of MCP, A2A, x402, UCP, llms.txt, and OpenAPI in one result.

## Known failure modes

- Domain does not exist or is unreachable — probe may return all protocols as absent or return an error
- Firewall or rate-limiting on the target host blocks the probe — status may be inaccurate
- Malformed domain input returns a 400 or path-not-found error
- Stale or cached results if re-probe was not explicitly triggered
- x402 payment failure prevents the probe from being executed

## 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

A JSON object containing the domain, a timestamp of when it was probed, and an array of protocol entries (e.g. UCP, ACP, AP2, TAP, MCP, A2A, x402, MPP, llms.txt, OpenAPI), each with its detection status: 'present', 'absent', or 'callable'.

## 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 being re-probed"
      }
     }
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "probedAt": "2026-01-01T00:00:00.000Z",
  "protocols": [
   {
    "id": "ucp",
    "status": "present"
   },
   {
    "id": "mcp",
    "status": "absent"
   },
   {
    "id": "x402",
    "status": "callable"
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vokko-multi-protocol-host-probe-fe8fd423/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)