Bulk Material

{
  "approxShortTons": 2.593,
  "asOf": "2026-10-11T14:25:12.116Z",
  "assumedLbPerYd3": 2800,
  "cubicFeet": 50,
  "cubicMeters": 1.416,
  "cubicYards": 1.85185,
  "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.",
  "material": "gravel",
  "notChecked": [
    "real density: weight swings with moisture, size and source (use your supplier's tons-per-yard figure for ordering by weight)",
    "slopes, uneven ground and edges",
    "…2 more"
  ],
  "orderYd3": 2,
  "reasons": [
    "Volume = area x depth / 12 / 27.",
    "Weight uses a typical 2800 lb per cubic yard for gravel; it varies widely.",
    "…1 more"
  ],
  "source": "computed locally",
  "summary": "1.852 yd3 of gravel for 200 sq ft at 3 in deep: about 2.59 short tons.",
  "totalCost": null,
  "verdict": "ESTIMATE"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://construction-calc.x402tookit.com/bulk-material?areaSqFt=200&depthIn=3&material=gravel'

# 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://construction-calc.x402tookit.com/bulk-material?areaSqFt=200&depthIn=3&material=gravel' \
  | 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%2Fconstruction-calc.x402tookit.com%2Fbulk-material
const res = await pay("https://construction-calc.x402tookit.com/bulk-material?areaSqFt=200&depthIn=3&material=gravel");
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://construction-calc.x402tookit.com/bulk-material?areaSqFt=200&depthIn=3&material=gravel")
    print(res.status_code, res.text)