An aWATTar API alternative for the whole of Europe
aWATTar's free hourly market-data API for Germany and Austria was a beloved staple of the home-automation community — and awattar.de now redirects to tado° Energy. If your Home Assistant, evcc or openWB setup depends on it, Voltcast ships a drop-in compatible endpoint: point your config at https://voltcast.com/api/v1/compat/awattar/de/marketdata (or /at/marketdata) and you get the identical JSON shape — keyless and free, like the original (price data: SMARD, CC BY 4.0). Migration is one base-URL swap. And when you want more zones, 15-minute resolution, forecasts or guarantees, the €9/month Home tier is built exactly for these setups.
| aWATTar API | Voltcast | |
|---|---|---|
| Coverage | Germany + Austria | 47 European zones incl. GB reference prices & grid data |
| 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) | Keyless DE/AT compat feed · Home €9/mo · Pro €199/mo |
Comparison reflects publicly documented capabilities as of August 2026. Corrections welcome: hello@voltcast.com.
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
How do I migrate from aWATTar in one line?
Replace https://api.awattar.de/v1/marketdata with https://voltcast.com/api/v1/compat/awattar/de/marketdata (Austria: .../awattar/at/marketdata). The response shape is identical — object/list, epoch-millisecond start_timestamp/end_timestamp, marketprice in Eur/MWh, hourly — and the start/end query parameters work the same. No API key needed.
Why pay €9 when the compat endpoint is free?
If hourly DE/AT prices are all you need, the free compat endpoint has you covered — forever. Voltcast Home adds native 15-minute resolution (matching how the market actually clears since October 2025), any of 47 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.
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