Logistics Dry Van Capacity

{
  "ataTruckTonnageIndex": {
    "changeMoMPct": -0.79,
    "changeYoYPct": -0.35,
    "month": "2026-07",
    "value": 113.5
  },
  "cassExpendituresIndex": {
    "changeMoMPct": 6.66,
    "changeYoYPct": 20.45,
    "month": "2026-09",
    "value": 3.97
  },
  "cassShipmentsIndex": {
    "changeMoMPct": 2.31,
    "changeYoYPct": 1.92,
    "month": "2026-09",
    "value": 1.062
  },
  "checkedAt": "2026-10-23T09:37:59.260Z",
  "history": {
    "ataTruckTonnage": [
      {
        "date": "2026-07",
        "value": 113.5
      },
      {
        "date": "2026-06",
        "value": 114.4
      }
    ],
    "cassExpenditures": [
      {
        "date": "2026-09",
        "value": 3.97
      },
      {
        "date": "2026-08",
        "value": 3.722
      }
    ],
    "cassShipments": [
      {
        "date": "2026-09",
        "value": 1.062
      },
      {
        "date": "2026-08",
        "value": 1.038
      }
    ],
    "impliedCostPerShipment": [
      {
        "date": "2026-09",
        "value": 3.7382
      },
      {
        "date": "2026-08",
        "value": 3.5857
      }
    ]
  },
  "impliedCostPerShipment": {
    "changeMoMPct": 4.25,
    "changeYoYPct": 18.18,
    "month": "2026-09",
    "value": 3.7382
  },
  "reading": "Falling shipments with rising cost per shipment usually means tightening truck capacity; the reverse means loose capacity.",
  "source": "https://fred.stlouisfed.org (Cass Information Systems; American Trucking Associations)"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.tradeenergy-api.workers.dev/api/logistics/dry-van-capacity?months=6'

# 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://api.tradeenergy-api.workers.dev/api/logistics/dry-van-capacity?months=6' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.tradeenergy-api.workers.dev%2Fapi%2Flogistics%2Fdry-van-capacity
const res = await pay("https://api.tradeenergy-api.workers.dev/api/logistics/dry-van-capacity?months=6");
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.tradeenergy-api.workers.dev/api/logistics/dry-van-capacity?months=6")
    print(res.status_code, res.text)