Truck Payload API
Given cargo weight and a vehicle type, returns remaining payload capacity and weight utilization. Optionally includes volume and pallet-count utilization. JSON in, JSON out. CORS open. Free for 60 requests per hour without a key.
30-second start
POST your inputs. Get back the answer in JSON. No signup. No key required for the first 60 calls per hour per IP.
curl
curl -X POST https://www.wearewarp.com/api/v1/tools/truck-payload \
-H "Content-Type: application/json" \
-d '{"cargo_weight":4500,"vehicle":"box_truck_26","cargo_volume":1100,"cargo_pallets":8}'Or use GET with query params for one-liners:
curl GET
curl "https://www.wearewarp.com/api/v1/tools/truck-payload?cargo_weight=4500&vehicle=box_truck_26&cargo_volume=1100&cargo_pallets=8"
Request
POST /api/v1/tools/truck-payload
Cargo van (3,000 lb max) — over-capacity example:
curl
curl -X POST https://www.wearewarp.com/api/v1/tools/truck-payload \
-H "Content-Type: application/json" \
-d '{"cargo_weight":3400,"vehicle":"cargo_van"}'Response
Every response has a data envelope (the computed result) and a meta envelope (rate limits, docs, upgrade path, attribution).
200 OK
{
"data": {
"vehicle": {
"slug": "box_truck_26",
"name": "Box Truck (26 ft)",
"max_lbs": 10000,
"cu_ft": 1600,
"pallet_capacity": 12
},
"cargo_weight_lb": 4500,
"remaining_weight_lb": 5500,
"weight_util_pct": 45,
"status": "within_capacity",
"cargo_volume_cu_ft": 1100,
"remaining_volume_cu_ft": 500,
"volume_util_pct": 68.8,
"cargo_pallets": 8,
"remaining_pallets": 4
},
"meta": {
"request_id": "req_lzgk2zo_a1b2c3d4",
"tier": "anon",
"rate_limit": { "limit": 60, "remaining": 59, "reset_at": "2026-05-15T19:00:00.000Z" },
"docs": "https://www.wearewarp.com/developers/tools-api/truck-payload",
"attribution": "Powered by Warp — https://www.wearewarp.com"
}
}Code samples
JavaScript (fetch)
const res = await fetch('https://www.wearewarp.com/api/v1/tools/truck-payload', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify({"cargo_weight":4500,"vehicle":"box_truck_26","cargo_volume":1100,"cargo_pallets":8}),
});
const { data, meta } = await res.json();
console.log(data.cargo_weight);Python (requests)
import requests
res = requests.post(
"https://www.wearewarp.com/api/v1/tools/truck-payload",
json={"cargo_weight":4500,"vehicle":"box_truck_26","cargo_volume":1100,"cargo_pallets":8},
)
data = res.json()["data"]
print(data["cargo_weight"])curl with sandbox key
curl -X POST https://www.wearewarp.com/api/v1/tools/truck-payload \
-H "Content-Type: application/json" \
-H "Authorization: Bearer wak_test_YOUR_KEY" \
-d '{"cargo_weight":4500,"vehicle":"box_truck_26","cargo_volume":1100,"cargo_pallets":8}'Rate limits and tiers
No tier blocks access. Hit the limit and the response includes an upgradeURL with the next tier's signup flow.
Every response includes X-RateLimit-Limit, X-RateLimit-Remaining, and X-RateLimit-Reset headers. The meta.rate_limit object mirrors the same values in JSON.
Rate-limited response:
429 Too Many Requests
{
"error": "Anonymous rate limit reached (60/hr). Get a free sandbox key for 1000/hr at https://www.wearewarp.com/agents/account.",
"code": "RATE_LIMITED",
"meta": { "tier": "anon", "rate_limit": { "limit": 60, "remaining": 0 }, "upgrade": "..." }
}Errors
Bad input example:
400 Bad Request
{
"error": "Unknown vehicle \"semi\". Valid: cargo_van, sprinter_van, box_truck_16, box_truck_26, dry_van_53.",
"code": "BAD_INPUT",
"meta": { "request_id": "req_...", "docs": "https://www.wearewarp.com/developers/tools-api/truck-payload" }
}Attribution
The free tier carries an attribution request: link back to wearewarp.com from any surface that displays results from this API. A “Powered by Warp” link in your footer is enough. Live keys remove the attribution request.
Every API response includes meta.attribution so you can render the link programmatically.
How truck payload is calculated
- Vehicle specs lookup. Each vehicle slug maps to published max payload (lb), interior volume (cu ft), and pallet capacity. Specs are industry standards for standard-size US equipment.
- Remaining weight. max_lbs − cargo_weight. Negative result means over capacity; status flips to over_capacity.
- Weight utilization %. cargo_weight ÷ max_lbs × 100.
- Optional volume + pallet utilization. Same formula applied to cu_ft (if cargo_volume passed) and pallet_capacity (if cargo_pallets passed).
Vehicle specs reflect typical interior cargo dimensions, not gross vehicle weight or external trailer length. Over-the-road regulations (axle weight, bridge laws, state-specific limits) may impose lower effective maxes on a specific lane.
Related
Get a free sandbox key
Sandbox keys take 30 seconds. No card. 1,000 calls per hour across every Warp tool API.