Hsa Growth Calculator

{
  "data": {
    "endingBalance": 183330.39159735557,
    "params": {
      "annualContribution": 4000,
      "annualExpenses": 0,
      "annualReturnRate": 0.07,
      "startingValue": 5000,
      "years": 20
    },
    "yearlyBalances": [
      9350,
      14004.5,
      18984.815000000002,
      24313.752050000003,
      30015.714693500006,
      36116.814722045005,
      42644.991752588154,
      49630.141175269324,
      57104.25105753818,
      65101.548631565856,
      73658.65703577547,
      82814.76302827976,
      92611.79644025935,
      103094.6221910775,
      114311.24574445294,
      126313.03294656465,
      139154.9452528242,
      152895.7914205219,
      167598.49681995847,
      183330.39159735557
    ]
  },
  "ok": true
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/hsaGrowthCalculator' \
  -H 'content-type: application/json' \
  --data-raw '{"annualContribution":4000,"annualExpenses":0,"annualReturnRate":0.07,"startingValue":5000,"years":20}'

# 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://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/hsaGrowthCalculator' \
  -H 'content-type: application/json' \
  --data-raw '{"annualContribution":4000,"annualExpenses":0,"annualReturnRate":0.07,"startingValue":5000,"years":20}' \
  | 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%2Fppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws%2FhsaGrowthCalculator&method=POST
const res = await pay("https://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/hsaGrowthCalculator", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "annualContribution": 4000,
    "annualExpenses": 0,
    "annualReturnRate": 0.07,
    "startingValue": 5000,
    "years": 20
  }),
});
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://ppu43fkyhimq5fiqpmo42eh5ri0yypid.lambda-url.us-east-1.on.aws/hsaGrowthCalculator",
        json={
            "annualContribution": 4000,
            "annualExpenses": 0,
            "annualReturnRate": 0.07,
            "startingValue": 5000,
            "years": 20,
        },
    )
    print(res.status_code, res.text)