Paid Preflight Amazon

{
  "checks": [
    {
      "detail": "Title is within the recommended length.",
      "id": "title-length",
      "label": "Title length",
      "scope": "platform",
      "status": "PASS",
      "weight": 10
    }
  ],
  "counts": {
    "fail": 0,
    "pass": 9,
    "warning": 2
  },
  "keywordObservations": {},
  "missingInformation": [],
  "payment": {
    "chainStatus": "confirmed",
    "quote": "q_example",
    "receipt": "rcpt_example",
    "transaction": "0x..."
  },
  "recommendations": [
    "Add at least two more product images."
  ],
  "score": 82,
  "summary": "Listing is close to ready; address the warnings before publishing.",
  "verdict": "NEEDS_WORK"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://listing-grader-ai.lovable.app/api/public/paid-preflight/amazon?category=Home+%26+Garden+%3E+Gardening+%3E+Seeds&currency=GBP&description=Everything+needed+to+grow+fresh+basil+on+a+windowsill%3A+seeds%2C+peat+pots%2C+compost+discs+and+a+step-by-step+guide.&features=50+organic+seeds%3B+6+biodegradable+pots%3B+Germinates+in+7-10+days&imageCount=5&keywords=basil+seeds%2Cherb+kit%2Cindoor+garden&price=14.99&returns=30-day+returns+on+unopened+kits.&shipping=Free+UK+delivery+in+2-3+working+days.&title=Organic+Basil+Seed+Kit+-+Grow+Your+Own+Herbs+Indoors'

# 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://listing-grader-ai.lovable.app/api/public/paid-preflight/amazon?category=Home+%26+Garden+%3E+Gardening+%3E+Seeds&currency=GBP&description=Everything+needed+to+grow+fresh+basil+on+a+windowsill%3A+seeds%2C+peat+pots%2C+compost+discs+and+a+step-by-step+guide.&features=50+organic+seeds%3B+6+biodegradable+pots%3B+Germinates+in+7-10+days&imageCount=5&keywords=basil+seeds%2Cherb+kit%2Cindoor+garden&price=14.99&returns=30-day+returns+on+unopened+kits.&shipping=Free+UK+delivery+in+2-3+working+days.&title=Organic+Basil+Seed+Kit+-+Grow+Your+Own+Herbs+Indoors' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// 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 $0.05 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.05" });
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 $0.05 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Flisting-grader-ai.lovable.app%2Fapi%2Fpublic%2Fpaid-preflight%2Famazon
const res = await pay("https://listing-grader-ai.lovable.app/api/public/paid-preflight/amazon?category=Home+%26+Garden+%3E+Gardening+%3E+Seeds&currency=GBP&description=Everything+needed+to+grow+fresh+basil+on+a+windowsill%3A+seeds%2C+peat+pots%2C+compost+discs+and+a+step-by-step+guide.&features=50+organic+seeds%3B+6+biodegradable+pots%3B+Germinates+in+7-10+days&imageCount=5&keywords=basil+seeds%2Cherb+kit%2Cindoor+garden&price=14.99&returns=30-day+returns+on+unopened+kits.&shipping=Free+UK+delivery+in+2-3+working+days.&title=Organic+Basil+Seed+Kit+-+Grow+Your+Own+Herbs+Indoors");
console.log(res.status, await res.text());

# 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 $0.05 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.05"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://listing-grader-ai.lovable.app/api/public/paid-preflight/amazon?category=Home+%26+Garden+%3E+Gardening+%3E+Seeds&currency=GBP&description=Everything+needed+to+grow+fresh+basil+on+a+windowsill%3A+seeds%2C+peat+pots%2C+compost+discs+and+a+step-by-step+guide.&features=50+organic+seeds%3B+6+biodegradable+pots%3B+Germinates+in+7-10+days&imageCount=5&keywords=basil+seeds%2Cherb+kit%2Cindoor+garden&price=14.99&returns=30-day+returns+on+unopened+kits.&shipping=Free+UK+delivery+in+2-3+working+days.&title=Organic+Basil+Seed+Kit+-+Grow+Your+Own+Herbs+Indoors")
    print(res.status_code, res.text)