Sessions Start

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://rekt-ceo-brandification.onrender.com/api/sessions/start' \
  -H 'content-type: application/x-www-form-urlencoded' \
  --data-raw 'category=Classic&image=%3Cbinary%3E&templateId=drake'

# 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 - -X POST 'https://rekt-ceo-brandification.onrender.com/api/sessions/start' \
  -H 'content-type: application/x-www-form-urlencoded' \
  --data-raw 'category=Classic&image=%3Cbinary%3E&templateId=drake' \
  | 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 $0.19 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.19" });
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 $0.19 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Frekt-ceo-brandification.onrender.com%2Fapi%2Fsessions%2Fstart&method=POST
const res = await pay("https://rekt-ceo-brandification.onrender.com/api/sessions/start", {
  method: "POST",
  headers: { "content-type": "application/x-www-form-urlencoded" },
  body: new URLSearchParams([["category","Classic"],["image","<binary>"],["templateId","drake"]]),
});
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 $0.19 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.19"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://rekt-ceo-brandification.onrender.com/api/sessions/start",
        data={
            "category": "Classic",
            "image": "<binary>",
            "templateId": "drake",
        },
    )
    print(res.status_code, res.text)