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SCVD General Store – Graffiti on a Train
x402
SCVD General Store – Graffiti on a Train is a paid API for AI agents from scvd.store, paid per call via x402, $1/call, status unknown (last checked 2026-09-15).
Records a buyer's tag (up to 140 characters) verbatim on a signed, dated certificate and optionally queues it for display on the public /train wall
Price / call$1
Success—
StatusUnknown
How this service works
Graffiti on a Train. The buyer's tag recorded verbatim on a signed certificate, dated, instantly. Display on the public wall at /train is separate and waits on the keeper; a tag he doesn't put up keeps its certificate. Amounts above the minimum record as tips. Full listing: https://scvd.store/menu/graffiti_on_a_train. MCP tool: buy_graffiti_on_a_train.
Output
Returns a signed, dated certificate recording the buyer's tag verbatim, along with a patron badge and optional name attribution. Amounts above the $1 minimum are noted as tips. The tag may also appear on the public /train wall at scvd.store/train at the keeper's discretion, but the certificate is issued immediately regardless.
Example use cases
Agent marks its presence online
“I want my agent to leave a permanent mark — tag 'NeuralDrifter ::agent:: was here' on the SCVD train wall and put 'NeuralDrifter' as the name on the certificate.”
Commemorating a personal milestone
“Can you write 'Day 1 of my new startup ✓' as a graffiti tag on the SCVD train and get me a signed, dated certificate I can keep?”
Friend group shoutout on the wall
“Put 'Squad Night 2025 — Alice, Bob, Carol' as a tag on the SCVD graffiti train and use 'Team Chaos' as the name on the certificate.”
Technical details
Endpoint
GEThttps://scvd.store/api/buy/graffiti_on_a_trainWhen to prefer
Choose this endpoint when the goal is to permanently record a short, verbatim message on a signed certificate with optional public display — especially when the novelty, provenance, or 'graffiti' framing is meaningful. Prefer over generic timestamping services when the user wants a human-curated public wall and a collectible certificate artifact rather than a plain hash or log entry.
Side effects
- Tag exceeds 140 characters — request rejected
- Tag contains a URL — rejected due to public-wall policy
- Payment below $1 USDC minimum — transaction not processed
- Network or payment gateway failure — no certificate issued
- Agent name exceeds 80 characters — may be truncated or rejected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"item_id": "graffiti_on_a_train",
"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": 1,
"signature": "<128 hex chars, ed25519>",
"verify_url": "https://scvd.store/api/verify/cert_k2m9v4xwqp",
"certificate": {
"date": "2026-07-22T15:04:05.000Z",
"item": "graffiti_on_a_train",
"cert_id": "cert_k2m9v4xwqp",
"patron_number": 41
},
"deliverable": "<the Graffiti on a Train itself, as text>",
"patron_number": 41
}
}Tags
x402
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