Assistant Finance Loan Payment Stress Grid

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://market.datapackvibe.com/x402/assistant-finance-loan-payment-stress-grid' \
  -H 'content-type: application/json' \
  --data-raw '{"baseline":{"annual_nominal_rate_percent":6,"number_of_payments":36,"payments_per_year":12,"principal":10000},"field_x":"principal","field_y":"annual_nominal_rate_percent","values_x":[10000,11000],"values_y":[6,6.6000000000000005]}'

# 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://market.datapackvibe.com/x402/assistant-finance-loan-payment-stress-grid' \
  -H 'content-type: application/json' \
  --data-raw '{"baseline":{"annual_nominal_rate_percent":6,"number_of_payments":36,"payments_per_year":12,"principal":10000},"field_x":"principal","field_y":"annual_nominal_rate_percent","values_x":[10000,11000],"values_y":[6,6.6000000000000005]}' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmarket.datapackvibe.com%2Fx402%2Fassistant-finance-loan-payment-stress-grid&method=POST
const res = await pay("https://market.datapackvibe.com/x402/assistant-finance-loan-payment-stress-grid", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "baseline": {
      "annual_nominal_rate_percent": 6,
      "number_of_payments": 36,
      "payments_per_year": 12,
      "principal": 10000
    },
    "field_x": "principal",
    "field_y": "annual_nominal_rate_percent",
    "values_x": [
      10000,
      11000
    ],
    "values_y": [
      6,
      6.6000000000000005
    ]
  }),
});
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://market.datapackvibe.com/x402/assistant-finance-loan-payment-stress-grid",
        json={
            "baseline": {
                "annual_nominal_rate_percent": 6,
                "number_of_payments": 36,
                "payments_per_year": 12,
                "principal": 10000,
            },
            "field_x": "principal",
            "field_y": "annual_nominal_rate_percent",
            "values_x": [
                10000,
                11000,
            ],
            "values_y": [
                6,
                6.6000000000000005,
            ],
        },
    )
    print(res.status_code, res.text)