Coffee Brew

{
  "approxBrewedLiquidMl": 438,
  "asOf": "2026-10-11T14:26:08.478Z",
  "caffeineMgEstimate": {
    "high": 375,
    "low": 156,
    "typical": 234
  },
  "caffeineMgPer240Ml": 113,
  "coffeeG": 31.25,
  "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.",
  "fdaDailyGuidanceMgHealthyAdults": 400,
  "gramsPerLitre": 62.5,
  "method": "pour-over",
  "notChecked": [
    "taste: ratios are starting points, grind size, water temperature (about 90 to 96 C), time and the bean decide extraction",
    "the real caffeine in your coffee: it depends on bean species (robusta has roughly twice as much as arabica), roast, grind and brew, so the estimate is rough",
    "…2 more"
  ],
  "ratio": "1:16",
  "reasons": [
    "Ratio 1:16 (62.5 g per litre): common pour-over guideline.",
    "The SCA Golden Cup reference is 55 g/L (1:18), plus or minus 10%; many brewers use 60 to 67 g/L for a stronger cup.",
    "…1 more"
  ],
  "source": "computed locally",
  "summary": "pour-over: 31.25 g coffee to 500 mL water (1:16, 62.5 g/L). Roughly 234 mg caffeine in total (range 156 to 375).",
  "verdict": "COMPUTED",
  "waterMl": 500
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://cooking-calc.x402tookit.com/coffee-brew?method=pour-over&waterMl=500'

# 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://cooking-calc.x402tookit.com/coffee-brew?method=pour-over&waterMl=500' \
  | 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%2Fcooking-calc.x402tookit.com%2Fcoffee-brew
const res = await pay("https://cooking-calc.x402tookit.com/coffee-brew?method=pour-over&waterMl=500");
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://cooking-calc.x402tookit.com/coffee-brew?method=pour-over&waterMl=500")
    print(res.status_code, res.text)