An aWATTar API alternative for the whole of Europe
aWATTar's free hourly market-data API for Germany and Austria is a beloved staple of the home-automation community. If you need more zones, 15-minute resolution, forecasts or guarantees, Voltcast picks up where it stops — with a €9/month Home tier built exactly for Home Assistant, evcc and hobbyist setups.
| aWATTar API | Voltcast | |
|---|---|---|
| Coverage | Germany + Austria | 43 EU zones + GB |
| Resolution | Hourly | 15-minute native (the market itself since Oct 2025) |
| Forecasts | None | 7-day P50 (P10/P90 on Pro), accuracy published daily |
| History | Limited | To 2015, bulk export on Pro |
| Push | None | Webhooks + SSE stream |
| Home automation | Community integrations | Official Home Assistant component + evcc recipe + widget |
| Price | Free (DE/AT, hourly) | Free zone forever · Home €9/mo · Pro €199/mo |
Comparison reflects publicly documented capabilities as of July 2026. Corrections welcome: [email protected].
Three lines to your first price curve
curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://voltcast.com/api/v1/prices/DE-LU?from=2026-07-10&to=2026-07-12"
Frequently asked
Why pay €9 when aWATTar is free?
If hourly DE/AT prices are all you need, aWATTar is great and you should use it. Voltcast Home adds native 15-minute resolution (matching how the market actually clears since October 2025), any of 43 zones, 90 days of history, a 7-day forecast with publicly verified accuracy, carbon data and a webhook — for the price of two coffees a month.
Does Voltcast work with Home Assistant and evcc?
Yes. There is an official HACS-compatible Home Assistant component (current price, today min/max/mean, next-hour forecast sensors) and a working evcc tariff recipe — plus a free embeddable price widget for dashboards.
Which zones can I pick on the Home tier?
Any single active bidding zone — Germany, Austria, the Netherlands, all four Swedish and five Norwegian zones, Finland, Denmark, France, Spain, Italy and more. You can switch your zone from the dashboard at any time.
Check our accuracy before you commit.
Every forecast we sell is benchmarked in public, every day, against a free baseline — and if we don't beat it in your zone, that zone is free. That's in the terms.
30 seconds · no credit card · free zone forever