Freight Density

{
  "airBillsOn": "volume",
  "airChargeableKg": 160,
  "asOf": "2026-10-11T23:32:56.445Z",
  "cbm": 0.96,
  "cubicFeet": 33.902,
  "degraded": false,
  "densityKgPerM3": 125,
  "densityLbPerFt3": 7.803,
  "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
  "notChecked": [
    "the actual chargeable-weight rule and minimums of your airline or forwarder",
    "LCL minimum charges and per-shipment fees",
    "…1 more"
  ],
  "reasons": [
    "Air breaks even at about 166.7 kg/m3 (1:6000); sea breaks even at 1000 kg/m3 (1 tonne = 1 CBM).",
    "Stowage factor 8 m3 per tonne."
  ],
  "seaBillsOn": "measurement",
  "seaChargeableRevenueTons": 0.96,
  "source": "computed locally (density arithmetic)",
  "stowageFactorM3PerTonne": 8,
  "summary": "Density 125 kg/m3 (7.8 lb/ft3): air bills on volume, sea on measurement.",
  "verdict": "BULKY"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://shipping-calc.x402tookit.com/freight-density?height=100&length=120&unit=cm&weightKg=120&width=80'

# 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://shipping-calc.x402tookit.com/freight-density?height=100&length=120&unit=cm&weightKg=120&width=80' \
  | 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%2Fshipping-calc.x402tookit.com%2Ffreight-density
const res = await pay("https://shipping-calc.x402tookit.com/freight-density?height=100&length=120&unit=cm&weightKg=120&width=80");
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://shipping-calc.x402tookit.com/freight-density?height=100&length=120&unit=cm&weightKg=120&width=80")
    print(res.status_code, res.text)