Routes Invoice From Data

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://stackbill.app/routes/x402/invoice-from-data' \
  -H 'content-type: application/json' \
  --data-raw '{"currency":"USD","dueDate":"2026-08-01","invoiceNumber":"INV-2026-042","lineItems":[{"description":"Backend development","quantity":10,"unitPrice":95},{"description":"Code review","quantity":2,"unitPrice":120}],"notes":"Payment due within 30 days.","recipient":{"address":"456 Oak Ave, Chicago, IL 60601","name":"Acme Corp"},"sender":{"address":"123 Main St, Springfield, IL 62701","name":"Jane Doe Consulting"},"taxRate":7.5}'

# 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://stackbill.app/routes/x402/invoice-from-data' \
  -H 'content-type: application/json' \
  --data-raw '{"currency":"USD","dueDate":"2026-08-01","invoiceNumber":"INV-2026-042","lineItems":[{"description":"Backend development","quantity":10,"unitPrice":95},{"description":"Code review","quantity":2,"unitPrice":120}],"notes":"Payment due within 30 days.","recipient":{"address":"456 Oak Ave, Chicago, IL 60601","name":"Acme Corp"},"sender":{"address":"123 Main St, Springfield, IL 62701","name":"Jane Doe Consulting"},"taxRate":7.5}' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fstackbill.app%2Froutes%2Fx402%2Finvoice-from-data&method=POST
const res = await pay("https://stackbill.app/routes/x402/invoice-from-data", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "currency": "USD",
    "dueDate": "2026-08-01",
    "invoiceNumber": "INV-2026-042",
    "lineItems": [
      {
        "description": "Backend development",
        "quantity": 10,
        "unitPrice": 95
      },
      {
        "description": "Code review",
        "quantity": 2,
        "unitPrice": 120
      }
    ],
    "notes": "Payment due within 30 days.",
    "recipient": {
      "address": "456 Oak Ave, Chicago, IL 60601",
      "name": "Acme Corp"
    },
    "sender": {
      "address": "123 Main St, Springfield, IL 62701",
      "name": "Jane Doe Consulting"
    },
    "taxRate": 7.5
  }),
});
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://stackbill.app/routes/x402/invoice-from-data",
        json={
            "currency": "USD",
            "dueDate": "2026-08-01",
            "invoiceNumber": "INV-2026-042",
            "lineItems": [
                {
                    "description": "Backend development",
                    "quantity": 10,
                    "unitPrice": 95,
                },
                {
                    "description": "Code review",
                    "quantity": 2,
                    "unitPrice": 120,
                },
            ],
            "notes": "Payment due within 30 days.",
            "recipient": {
                "address": "456 Oak Ave, Chicago, IL 60601",
                "name": "Acme Corp",
            },
            "sender": {
                "address": "123 Main St, Springfield, IL 62701",
                "name": "Jane Doe Consulting",
            },
            "taxRate": 7.5,
        },
    )
    print(res.status_code, res.text)