Agent Card Hosting

host your agents
at predictable URLs

host39 is a third-party A2A agent card host. Register your identity, create agent cards, and publish them at stable public URLs — no server required.

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How it works

Three steps to publish your agent

01

Register

Create an account with your email or a domain identity (for businesses). Domain users get URLs like /moonbakery.com/orders.json.

02

Create a card

Fill in your agent name, runtime URL, capabilities, authentication, and skills using our guided form.

03

Share the URL

Your card is live at a stable public URL. Register it with the NANDA Index so resolvers can find your agent by identity.

URL patterns

Predictable, stable, public

Business / Domain

/moonbakery.com/orders.json

Register with a domain identity to get clean, branded URLs for your business agents.

Personal / Email

/personal/john@hotmail.com/card.json

Register with your email for personal agent cards — great for developers and individuals.

A2A Agent Card format

Standard JSON, served instantly

{
  "name": "Moon Bakery Orders Agent",
  "description": "Place and track orders at Moon Bakery.",
  "url": "https://moonbakery-orders.aws.example.com",
  "version": "1.0",
  "capabilities": {
    "streaming": false,
    "pushNotifications": false
  },
  "authentication": {
    "schemes": [
      "Bearer"
    ]
  },
  "skills": [
    {
      "name": "placeOrder",
      "description": "Place a new bakery order"
    },
    {
      "name": "trackOrder",
      "description": "Track an existing order status"
    }
  ],
  "provider": {
    "organization": "Moon Bakery",
    "url": "https://moonbakery.com"
  },
  "_meta": {
    "identifier": "urn:ai:domain:moonbakery.com:agent:orders",
    "publicUrl": "https://agentcards.host39.org/moonbakery.com/orders.json",
    "hostedBy": "host39.org"
  }
}