Aquarium Volume

{
  "asOf": "2026-10-12T01:16:19.106Z",
  "cubicInches": 4320,
  "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.",
  "grossGallonsUS": 18.7,
  "grossLiters": 70.79,
  "grossWaterWeightLb": 156,
  "notChecked": [
    "the real water line (tanks are filled below the rim)",
    "weight of the glass or acrylic, stand, substrate, rock and equipment",
    "…1 more"
  ],
  "reasons": [
    "US gallon = 231 cubic inches; fresh water weighs about 8.34 lb per gallon (1 kg per litre).",
    "A full tank's weight on its stand is much more than the water alone."
  ],
  "source": "computed locally (231 cubic inches per US gallon)",
  "summary": "18.7 US gallons (70.8 L) gross; about 16.8 gal of water at 90% usable, weighing 140 lb.",
  "ukGallons": 15.57,
  "usableGallonsUS": 16.83,
  "usableLiters": 63.71,
  "usablePercent": 90,
  "verdict": "COMPUTED",
  "waterWeightKg": 63.7,
  "waterWeightLb": 140.4
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://pet-calc.x402tookit.com/aquarium-volume?height=12&length=30&unit=in&width=12'

# 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://pet-calc.x402tookit.com/aquarium-volume?height=12&length=30&unit=in&width=12' \
  | 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%2Fpet-calc.x402tookit.com%2Faquarium-volume
const res = await pay("https://pet-calc.x402tookit.com/aquarium-volume?height=12&length=30&unit=in&width=12");
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://pet-calc.x402tookit.com/aquarium-volume?height=12&length=30&unit=in&width=12")
    print(res.status_code, res.text)