MCP Tool · x402 · early usage

Graffiti on a Train

by scvd.store · discovered, not yet claimed by its owner · updated 2026-10-08

30d calls2

30d payers2

MethodGET

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Graffiti on a Train. REQUIRES ?tag= on the paid request — a signed request without it is refused before the gate and no money moves. 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.

Tags: x402 · signed-artifacts · verification · attestation · conformance · bazaar · required-inputs

Call contract

Method: GET
Input: query parameters
Output: json
Last paid call: 2026-10-08

Input example from Bazaar metadata

{
  "agent_name": "friendly-agent",
  "tag": "friendly-agent wuz here"
}

Output example

{
  "badge_url": "https://scvd.store/badges/41.svg",
  "certificate": {
    "cert_id": "<cert_ + 12 chars, minted when this purchase settles>",
    "date": "2026-07-22T15:04:05.000Z",
    "item": "graffiti_on_a_train",
    "patron_number": 41
  },
  "deliverable": "<the Graffiti on a Train itself, as text>",
  "item_id": "graffiti_on_a_train",
  "message": "Pleasure doing business. Here's your goods, warm off the shelf.",
  "paid_usdc": 1,
  "patron_number": 41,
  "signature": "<128 hex chars, ed25519>",
  "tip_usdc": 0,
  "verify_url": "https://scvd.store/api/verify/<your cert_id>"
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/26419.json for the price and payment options.
Pay. Call GET https://scvd.store/api/buy/graffiti_on_a_train. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Arbitrum One, eip155:480, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $1 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Arbitrum One, eip155:480, Solana
Demand: 2 calls · 2 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$1	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Base eip155:8453	USDC	$2	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Base eip155:8453	USDC	$5	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Polygon eip155:137	USDC	$1	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Polygon eip155:137	USDC	$2	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Polygon eip155:137	USDC	$5	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Arbitrum One eip155:42161	USDC	$1	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Arbitrum One eip155:42161	USDC	$2	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Arbitrum One eip155:42161	USDC	$5	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	eip155:480 eip155:480	0x79a02482a880bce3f13e09da970dc34db4cd24d1	1000000	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	eip155:480 eip155:480	0x79a02482a880bce3f13e09da970dc34db4cd24d1	2000000	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	eip155:480 eip155:480	0x79a02482a880bce3f13e09da970dc34db4cd24d1	5000000	0xDD350976B8cfFc65938C0464d39A2C78BE079bd0	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$1	DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$2	DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$5	DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "1000000",
    "amountUsd": 1,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "2000000",
    "amountUsd": 2,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000000",
    "amountUsd": 5,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "1000000",
    "amountUsd": 1,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "2000000",
    "amountUsd": 2,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "5000000",
    "amountUsd": 5,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "1000000",
    "amountUsd": 1,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "2000000",
    "amountUsd": 2,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:42161",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "amount": "5000000",
    "amountUsd": 5,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:480",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x79a02482a880bce3f13e09da970dc34db4cd24d1",
    "amount": "1000000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:480",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x79a02482a880bce3f13e09da970dc34db4cd24d1",
    "amount": "2000000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:480",
    "payTo": "0xDD350976B8cfFc65938C0464d39A2C78BE079bd0",
    "asset": "0x79a02482a880bce3f13e09da970dc34db4cd24d1",
    "amount": "5000000",
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "1000000",
    "amountUsd": 1,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "2000000",
    "amountUsd": 2,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "DGxcPrAHL9YM3hW7iXuHFJmr87Zr6AMA4jCYHBpuvMgE",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "5000000",
    "amountUsd": 5,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "properties": {
    "example": {
      "type": "object"
    },
    "type": {
      "type": "string"
    }
  },
  "required": [
    "type"
  ],
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{
  "example": {},
  "type": "string"
}

Examples

curl

curl "https://scvd.store/api/buy/graffiti_on_a_train"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://scvd.store/api/buy/graffiti_on_a_train");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://scvd.store/api/buy/graffiti_on_a_train")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: scvd.store
Endpoint: https://scvd.store/api/buy/graffiti_on_a_train
Machine-readable: /resources/26419.json