Synergic APIsSynergic APIs

The catalog

Official US data, one key for everything

Every API below is included in every plan — the free tier too. One X-Api-Key, the same base URL, the same error contract, hard caps and no overage. Paid plans change one thing: your monthly volume.

500 req/mo free · No credit card required

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Macro

US economy

US Inflation API

Since 1913

Monthly CPI for 11 categories with YoY/MoM computed like the BLS, plus the famous average prices: eggs, gasoline, milk, coffee.

GET/inflation/latest

Docs & live demo

US National Debt API

Since 1790

The debt to the penny every business day since 1993, annual since 1790, and average interest rates by security class.

GET/debt/latest

Docs & live demo

Energy

US energy data

US Oil Prices API

WTI & Brent

Daily WTI and Brent spot prices (USD per barrel) from the EIA, with full paginated history.

GET/oil/latest

Docs & live demo

US Natural Gas Price API

Since 1997

Henry Hub spot (USD per MMBtu): daily since 1997 plus official weekly, monthly and annual aggregates.

GET/gas/latest

Docs & live demo

US Retail Fuel Prices API

Since 1990

The weekly pump survey: gasoline and diesel (USD per gallon) for the US average, five PADD districts and California.

GET/fuel/latest

Docs & live demo

US Oil Inventories API

Since 1982

Weekly petroleum stocks the market moves on: crude, Cushing, SPR, gasoline and distillates (MBBL).

GET/oil-inventories/latest

Docs & live demo

US Natural Gas Storage API

Since 2010

The Thursday release that moves gas markets: working gas in BCF for the Lower 48 and every EIA region, weekly.

GET/gas-storage/latest

Docs & live demo

US Natural Gas Trade API

Since 1973

LNG and pipeline imports/exports — including the Mexico and Canada bilaterals — plus average trade prices, monthly.

GET/gas-trade/latest

Docs & live demo

US Oil Production API

Since 1920

Both official cadences: the weekly national estimate plus the monthly EIA-914 survey by state — US total back to 1920.

GET/oil-production/latest

Docs & live demo

US Crude Oil Imports API

Since 2009

Who supplies America's crude: monthly import volumes by origin country and crude grade (EIA-814).

GET/oil-imports/latest

Docs & live demo

US Fuel Demand API

Since 1990

The weekly demand proxy the market reads every Wednesday: EIA "products supplied" for seven product groups.

GET/fuel-demand/latest

Docs & live demo

US Refinery Utilization API

Since 1982

How hard refineries are running: utilization, gross and crude inputs and capacity — weekly, US and by PADD.

GET/refinery/latest

Docs & live demo

US Nuclear Outages API

Since 2007

The daily health of the US nuclear fleet: capacity, megawatts on outage and the outage percentage — no gaps.

GET/nuclear/latest

Docs & live demo

US Energy Forecasts API (STEO)

Forecasts

The official EIA Short-Term Energy Outlook: eleven headline series — WTI, Brent, Henry Hub, production and more.

GET/steo/latest

Docs & live demo

How the platform works

1One free key covers every API — 500 requests/month, no credit card.
2Same base URL, same X-Api-Key header, same error codes everywhere.
3Hard caps, never overage. Need volume? Plans from $7.99/mo raise the cap across all APIs.