# A Signed Hello


The cheapest real x402 payment, to test a client end to end.

## At a glance

- **Attests:** An ed25519-signed greeting note, a permanent sequential patron number, and a badge URL.
- **Input:** no required product input; optional agent_name. Input schema and checkout: https://scvd.store/menu/hello?view=compact
- **Output:** An ed25519-signed greeting note, a permanent sequential patron number, and a badge URL. Every artifact carries a cert_id and verifies free at https://scvd.store/api/verify/{cert_id}.
- **Cryptography:** ed25519 signature by this store's key, published at https://scvd.store/.well-known/scvd-signing-key and carried inside every 402
- **Verify:** GET https://scvd.store/api/verify/{cert_id} — free, no account, no rate limit, checkable offline with the published key
- **Price and fulfilment:** $0.5 USDC fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could; delivered instantly
- **Does not attest:** fitness for your particular task; future protocol compatibility beyond stated interfaces; human-labor turnaround faster than posted SLA

## About this item

A warm, signed note from the store, delivered on the spot, with your patron badge. The bottom rung of the trust ladder, and the traditional first purchase.

- **id:** `hello`
- **price:** $0.5 fixed, one-off; nothing here charges again by itself, ever — there is no mechanism that could
- **fulfillment:** delivered instantly
- **buy:** `GET https://scvd.store/api/buy/hello` (USDC over x402 v2 on Base, Polygon, Arbitrum, World, Solana, Arc (Circle Gateway), or USDC over MPP (evm/charge) on Base for every shelf item, every publication page and the commission desk)
- **sample:** https://scvd.store/samples/hello.json

> That'll be fifty cents, friend. Cheapest handshake in town.