Macro Split

{
  "asOf": "2026-10-11T08:36:50.861Z",
  "calories": 2000,
  "degraded": false,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "grams": {
    "carbs": 200,
    "fat": 66.667,
    "protein": 150
  },
  "kcalFrom": {
    "carbs": 800,
    "fat": 600,
    "protein": 600
  },
  "notChecked": [
    "your protein needs per kilogram of body weight (a common range for active adults is 1.2 to 2.2 g/kg: check it against your weight)",
    "fibre, alcohol and micronutrients",
    "…1 more"
  ],
  "percent": {
    "carbs": 40,
    "fat": 30,
    "protein": 30
  },
  "preset": "balanced",
  "reasons": [
    "Uses 4 kcal per gram of protein and carbohydrate and 9 kcal per gram of fat.",
    "Check protein against body weight: grams per kg matters more than the percentage."
  ],
  "source": "computed locally",
  "summary": "2000 kcal at balanced (30% protein / 40% carbs / 30% fat): 150 g protein, 200 g carbs, 67 g fat.",
  "verdict": "COMPUTED"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://fitness-calc.x402tookit.com/macro-split?calories=2000&preset=balanced'

# 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://fitness-calc.x402tookit.com/macro-split?calories=2000&preset=balanced' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ffitness-calc.x402tookit.com%2Fmacro-split
const res = await pay("https://fitness-calc.x402tookit.com/macro-split?calories=2000&preset=balanced");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://fitness-calc.x402tookit.com/macro-split?calories=2000&preset=balanced")
    print(res.status_code, res.text)