# SiteCheck Trade & Energy – Dry Van Capacity (US Freight Demand & Capacity Proxies)

> SiteCheck Trade & Energy – Dry Van Capacity (US Freight Demand & Capacity Proxies) is a paid API for AI agents from api.tradeenergy-api.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-29).

Returns monthly US truck freight demand and capacity proxy indicators from FRED — Cass Freight Index shipments and expenditures, implied freight cost per shipment, and ATA truck tonnage — with month-over-month and year-over-year changes.

## Facts

- Endpoint: GET https://api.tradeenergy-api.workers.dev/api/logistics/dry-van-capacity?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sitecheck-trade-energy-dry-van-capacity-us-freight-demand-capacity-ec5def28
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6Uos8eIDjC-5S79FRL86F

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability sitecheck-trade-energy-dry-van-capacity-us-freight-demand-capacity-ec5def28
```

Example prompt: Pull the latest US truck freight capacity indicators — Cass Freight Index shipments, expenditures, implied cost per shipment, and ATA truck tonnage — with month-over-month and year-over-year changes for the last 12 months so I can see whether dry van capacity is tightening or loosening.

## When to prefer this

Use this endpoint when you need national-level, macro US truck freight demand and capacity proxy indicators derived from authoritative FRED/Cass/ATA sources, with historical trend context and MoM/YoY changes pre-calculated. Prefer this over load-board or tender-rejection feeds when you want official, cleaned monthly index data rather than real-time spot market signals. Not suitable for lane-level pricing, real-time load matching, or regional capacity analysis.

## Known failure modes

- FRED data lag: ATA tonnage typically lags 1–2 months behind Cass data, so the latest months for different series may differ
- Invalid months parameter (outside 1–24 range) may return an error or default behavior
- Data may be temporarily unavailable if FRED upstream is down
- Monthly granularity only — no weekly, daily, or lane-level resolution
- National aggregate data only — cannot provide regional or corridor-level breakdowns

## How this service works

US truck freight demand and capacity proxies from FRED (monthly): Cass Freight Index shipments and expenditures, the implied freight cost per shipment (expenditures / shipments), and ATA truck tonnage, each with month-over-month and year-over-year change. National, monthly data; it is not a lane-level tender rejection or load-board feed.

## Output

A JSON object containing: latest index values for Cass Freight Index shipments, Cass Freight Index expenditures, implied freight cost per shipment (expenditures/shipments), and ATA truck tonnage — each with their most recent month value, month-over-month percent change, and year-over-year percent change. Also includes historical time series arrays for each indicator covering the requested number of months, a source attribution to FRED, a timestamp, and a plain-English interpretation of what the combined signals suggest about capacity conditions.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [],
     "properties": {
      "months": {
       "type": "string",
       "description": "Months of history, 1 to 24 (default 6)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

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

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sitecheck-trade-energy-dry-van-capacity-us-freight-demand-capacity-ec5def28/health.json
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- [Other services from api.tradeenergy-api.workers.dev](https://www.zero.xyz/host/api.tradeenergy-api.workers.dev/llms.txt)