vokko.eu · capability index
What can a machine actually do at this URL?
UCP Checker grades storefronts on /.well-known/ucp. Vokko does not. We probe the whole agent stack — commerce, authorization, identity, tools, and machine payment — and publish the matrix. A UCP-only shop is a single green cell, not an A.
Safe GETs only. No checkout. Presence cache 24h · callability 15 min. Try allbirds.com · stripe.com · openai.com · shopify.com · github.com
Protocols in this index
- Universal Commerce Protocol
ucp · commerce · Google + Shopify + partners
Merchant capability profile at /.well-known/ucp. Necessary for Google/Shopify agent shopping — not sufficient for machine payment or tool use.
- Agentic Commerce Protocol
acp · commerce · OpenAI + Stripe
Chat-originated checkout (Shared Payment Tokens). Separate from UCP. Product feeds live at agenticcommerce.dev.
- Agent Payments Protocol
ap2 · authorization · Google
Cryptographic spend mandates: proof a human delegated a specific purchase. Composes with UCP/ACP; it is not a storefront spec.
- Trusted Agent Protocol
tap · identity · Visa + Cloudflare
Signs agent identity into HTTP headers so fraud engines stop treating legitimate agents as botnets.
- Model Context Protocol
mcp · tools · Anthropic / Linux Foundation
Tool and data surface for agents (JSON-RPC). A shop can be UCP-ready and still have no MCP tools.
- Agent2Agent
a2a · tools · Google
Agent card / A2A discovery so agents can talk to other agents, not just storefronts.
- x402 (HTTP 402)
x402 · payment · Coinbase + Cloudflare
Pay-per-call over HTTP 402 + stablecoins. The micro-commerce rail cards cannot price.
- Machine Payments Protocol
mpp · payment · Stripe + Tempo
HTTP-native machine payments with recurring/usage envelopes. Sibling of x402, not a UCP profile.
- llms.txt
llms · discovery · Community
A markdown map for language models. Discovery only — does not let an agent pay or check out.
- OpenAI plugin manifest
ai-plugin · tools · OpenAI (legacy)
ChatGPT plugin era manifest. Still published by some APIs; useful as a tool-surface signal.
- OpenAPI
openapi · tools · OpenAPI Initiative
Machine-readable HTTP API. Agents that cannot shop can still call.
Machine API
Humans get HTML. Agents get JSON. Cached lookup is free. If callabilityStale is true, pay GET /api/v1/hosts/{domain}/refresh for a live probe. ?refresh=1 on your host is the origin-owner SKU. Agents can also call the OpenAPI document or POST MCP tools at /api/v1/mcp (lookup_host is free; refresh_host is the same paywall).
GET https://vokko.eu/openapi.json
POST https://vokko.eu/api/v1/mcp
GET https://vokko.eu/api/v1/hosts/{domain}
GET https://vokko.eu/api/v1/hosts/{domain}/refresh