API documentation
US Oil Inventories API
Since 1982The weekly stocks the market moves on (thousand barrels): US crude since 1982, Cushing hub, the Strategic Petroleum Reserve, total gasoline and distillate fuel oil.
500 req/mo · No credit card required · One key, every API on the platform
- Checking status…
- Crude weekly since 1982
- 5 instruments · Cushing since 2004
- Thousand barrels (MBBL)
- Source: EIA Weekly Petroleum Status Report
Base URL & authentication
All endpoints live under one base URL. Authenticate every request with your key
in the X-Api-Key header — no OAuth, no signing. The same key works
on every API of the platform.
# Base URL {{GATEWAY_URL}} # Every request X-Api-Key: sk_live_YOUR_KEY
Missing or invalid keys return 401 — see
errors. The demo endpoint is the only keyless route.
Endpoints
All paths relative to the base URL. Every 200 ships ETag,
Cache-Control and RateLimit-* headers.
| Method | Path | Summary |
|---|---|---|
| GET | /oil-inventories/latest Free+ | Latest stocks for every instrument, one call. |
| GET | /oil-inventories/{instrument} Free+ | Latest stocks for one instrument — crude | cushing | spr | gasoline | distillate. |
| GET | /oil-inventories/{instrument}/history Free+ | Paginated weekly history per instrument: start/end, limit, keyset via meta.next_end. |
Sample — 200 /oil-inventories/latest
{
"data": [
{ "instrument": "crude", "period": "2026-07-24", "stocks": 438291, "unit": "MBBL", "source": "EIA" },
{ "instrument": "cushing", "period": "2026-07-24", "stocks": 24815, "unit": "MBBL", "source": "EIA" }
]
}
Errors, auth & limits
One uniform error contract everywhere:
{ "error": { "code", "message" } } with stable,
machine-readable codes — shared by every API on the platform.
| Status | Code | When |
|---|---|---|
| 401 | UNAUTHORIZED | Missing X-Api-Key header, or invalid/revoked key. |
| 400 | VALIDATION_ERROR | Bad query/path parameters. |
| 404 | INSTRUMENT_NOT_FOUND · NO_DATA · NOT_FOUND | Unknown value for the path parameter (the message lists the valid ones), no data for the requested range yet, or unknown route. |
| 429 | RATE_LIMITED | Per-minute limit of your plan exceeded — check Retry-After. |
| 429 | QUOTA_EXCEEDED | Monthly cap reached. Nothing is billed on top — resets on the 1st (UTC). |
| 502 | UPSTREAM_ERROR | The origin API was unreachable — retry shortly. |
Data provenance
The EIA Weekly Petroleum Status Report, five headline stock series: US crude oil (since 1982), Cushing OK (since 2004), the Strategic Petroleum Reserve, total motor gasoline and distillate fuel oil — in thousand barrels (MBBL), period = the survey week-ending Friday. This product is not endorsed by or affiliated with the EIA.
Example
curl -H "X-Api-Key: sk_live_YOUR_KEY" \ https://api.synergicapis.com/oil-inventories/latest
import requests
r = requests.get(
"https://api.synergicapis.com/oil-inventories/latest",
headers={"X-Api-Key": "sk_live_YOUR_KEY"},
)
r.raise_for_status()
print(r.json()["data"])
const res = await fetch("https://api.synergicapis.com/oil-inventories/latest", { headers: { "X-Api-Key": "sk_live_YOUR_KEY" }, }); const { data } = await res.json(); console.log(data);
Live demo
Real request against the production API — no key needed here (demo endpoint, 5 requests/minute).
Press the button to fetch the latest official figures.