# Vokko Host Protocol Refresh

> Vokko Host Protocol Refresh 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).

Triggers a fresh live probe of a specified domain to detect which agent-web protocols (UCP, MCP, x402, A2A, etc.) it supports, bypassing cached results.

## Facts

- Endpoint: GET https://www.vokko.eu/api/v1/hosts/%7Bdomain%7D/refresh?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-host-protocol-refresh-7800e467
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_nNBeI5HNspXizD2V-qUXO

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-host-protocol-refresh-7800e467
```

Example prompt: Can you do a fresh probe of stripe.com on Vokko to see which agent-web protocols it supports right now — like MCP, x402, A2A, and OpenAPI?

## When to prefer this

Use this endpoint when you need fresh, non-cached protocol detection for a domain — particularly when the host may have recently added or removed support for agent-web protocols like MCP, x402, or A2A. Prefer over the free cached GET when staleness is a concern (e.g. before integration decisions, compliance checks, or monitoring workflows).

## Known failure modes

- Domain not reachable — probe may time out or return error status
- Unknown or malformed domain returns 4xx error
- Rate limiting if too many refresh calls are made for same host
- Protocol detection may be incomplete if host blocks probing agents
- Temporary network issues may cause partial results

## 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 domain, the timestamp of the fresh probe, and an array of protocol entries — each with a protocol ID (e.g. 'ucp', 'mcp', 'x402') and its 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-host-protocol-refresh-7800e467/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)