API documentation
US Energy Forecasts API (STEO)
ForecastsThe official forecast the market quotes: eleven EIA Short-Term Energy Outlook headline series — prices, production and consumption — in monthly, quarterly and annual frequencies.
500 req/mo · No credit card required · One key, every API on the platform
- Checking status…
- Monthly values back to 1990 (electricity 1976)
- 11 headline series · 3 frequencies
- Horizon: ~18 monthly points into next year
- Release: monthly (first Tuesday after first Thursday, ~12:00 ET)
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 | /steo/latest Free+ | Current outlook for the ongoing period, every series |
| GET | /steo/{series} Free+ | Forecast path from ongoing period to STEO horizon end |
| GET | /steo/{series}/history Free+ | Paginated vintage history for a series |
{series}: wti | brent | henry-hub | propane | gasoline | diesel | electricity | crude-production | gas-production | coal-production | energy-consumption. Query frequency: monthly | quarterly | annual. History: start/end in the frequency format (YYYY-MM / YYYY-Q# / YYYY, keyset via meta.next_end), limit 1–100. /steo/latest returns the newest vintage of all 11 series.
Sample — 200 /steo/latest
{"data":[{"series":"wti","frequency":"monthly","period":"2026-07","value":63.37,"unit":"dollars per barrel","source":"EIA"},{"series":"henry-hub","frequency":"monthly","period":"2026-07","value":3.42,"unit":"dollars per million Btu","source":"EIA"}],"meta":{"source":"U.S. Energy Information Administration","frequency":"monthly","period":"2026-07"}}
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 | SERIES_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 Short-Term Energy Outlook headline series — official US government forecasts, refreshed on each monthly STEO release. Forecast values are the EIA’s, served as published (vintages change month to month; that is the nature of a forecast, not an error). 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/steo/latest
import requests
r = requests.get(
"https://api.synergicapis.com/steo/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/steo/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.