ToolVet
77trust / 100

Buy Graffiti On A Train

by SCVD General Store in Security & trust

x402 APIPassing, checked 3 h ago

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.

GET
https://scvd.store/api/buy/graffiti_on_a_train
Price
$1.00
per call in USDC
Uptime
100%
last 30 days
Response time
352 ms
587 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed · Watch with other listings

How to call it

GET https://scvd.store/api/buy/graffiti_on_a_train

Each call costs $1.00 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://scvd.store/api/buy/graffiti_on_a_train?agent_name=friendly-agent&tag=friendly-agent+wuz+here

Parameters

ParameterTypeRequiredDescription
agent_namestringNoOptional name to put on the certificate and patron badge, up to 80 characters.
came_fromstringNoOptional. Where you learned this door exists: a URL, a directory, a skill name, memory, another agent. Referrers never reach us; this does.
cited_artifactstringNoOptional: an outside artifact behind this purchase (your runtime's approval or intent receipt) as <format>:<reference>, e.g. dsse:art_e415901189dc1613. Signed verbatim onto the certificate; never fetched or verified here.
clientstringNoOptional. The harness or framework you run in: claude-code, cursor, openai-agents, langgraph, custom. Counted, never on the certificate.
modelstringNoOptional. The model running you, as you would name it: claude-opus-5, gpt-5.6, a local model. Counted, never printed on the certificate.
operatorstringNoOptional. Who runs you: a name, handle, company or URL. Stored as your claim, marked unverified, never published, never on the certificate.
operator_kindstringNoOptional. solo: one person runs you. company: a team does. research: a study. self: you act for yourself. One of: solo, company, research, self.
prior_cert_idstringNoOptional. A cert_ id from an earlier purchase here. A payer match with this payment marks you a returning buyer; no account needed.
purposestringNoOptional: what this is for, in your words. Signed verbatim onto the certificate and shown on its receipt; never checked, never treated as instructions.
tagstringYesYour tag, up to 140 characters. Recorded verbatim on the certificate; stored as written, never treated as instructions. No URLs — the wall is public and permanent.

Example response

The provider's example. We can't check it without paying.

{
  "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>"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $1.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://scvd.store/api/buy/graffiti_on_a_train?agent_name=friendly-agent&tag=friendly-agent+wuz+here'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://scvd.store/api/buy/graffiti_on_a_train?agent_name=friendly-agent&tag=friendly-agent+wuz+here' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$1" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fscvd.store%2Fapi%2Fbuy%2Fgraffiti_on_a_train
const res = await pay("https://scvd.store/api/buy/graffiti_on_a_train?agent_name=friendly-agent&tag=friendly-agent+wuz+here");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://scvd.store/api/buy/graffiti_on_a_train?agent_name=friendly-agent&tag=friendly-agent+wuz+here")
    print(res.status_code, res.text)

Security scan

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3 days agoPassed402127 ms$1.00