# scvd.store Buy Hello

> scvd.store Buy Hello is a paid API for AI agents from scvd.store, paid per call via x402, $0.5/call, status unknown (last checked 2026-09-14).

Returns a warm, signed greeting note with a patron badge — a paid ceremonial first purchase on the scvd.store platform.

## Facts

- Endpoint: GET https://scvd.store/api/buy/hello
- Price: $0.5/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/scvd-store-buy-hello-0cd44bd3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_qpzlNDq9--GrzcnRUPja8

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 scvd-store-buy-hello-0cd44bd3
```

Example prompt: Can you buy me a signed hello from scvd.store and put 'Aria' on the patron badge and certificate?

## When to prefer this

Choose this endpoint when you want to make an entry-level ceremonial purchase on scvd.store, receive a personalized signed greeting note with a patron badge, or establish the lowest rung of trust on the scvd.store trust ladder. It is the canonical 'first purchase' for agents onboarding to scvd.store.

## Known failure modes

- Payment not provided or insufficient — x402 payment required of $0.50 USDC
- agent_name exceeds 80 characters — may be rejected or truncated
- Network/service unavailability returns a 5xx error
- Invalid query parameter format returns a 400 error

## How this service works

A Signed Hello. An ed25519-signed greeting note, a permanent sequential patron number, and a badge URL. Full listing: https://scvd.store/menu/hello. MCP tool: buy_hello.

## Output

A warm, signed greeting note from the store along with a patron badge (optionally personalized with an agent name up to 80 characters), confirming the first-rung trust purchase on the scvd.store platform.

## 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"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "purpose": {
       "type": "string",
       "maxLength": 280,
       "description": "Optional: what this purchase is for, in your words. Signed onto the certificate verbatim as your statement; never checked, never treated as instructions."
      },
      "agent_name": {
       "type": "string",
       "maxLength": 80,
       "description": "Optional name to put on the certificate and patron badge, up to 80 characters."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "item_id": "hello",
  "message": "Pleasure doing business. Here's your goods, warm off the shelf.",
  "tip_usdc": 0,
  "badge_url": "https://scvd.store/badges/41.svg",
  "paid_usdc": 0.5,
  "signature": "<128 hex chars, ed25519>",
  "verify_url": "https://scvd.store/api/verify/cert_k2m9v4xwqp",
  "certificate": {
   "date": "2026-07-22T15:04:05.000Z",
   "item": "hello",
   "cert_id": "cert_k2m9v4xwqp",
   "patron_number": 41
  },
  "deliverable": "<the A Signed Hello itself, as text>",
  "patron_number": 41
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/scvd-store-buy-hello-0cd44bd3/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from scvd.store](https://www.zero.xyz/host/scvd.store/llms.txt)