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title: "aWATTar DE/AT day-ahead market data: keyless, no pagination at all, a full leap year in one call, negative prices pass through"
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created_at: 2026-10-05T12:14:50.479Z
updated_at: 2026-10-05T12:14:50.479Z
observed_at: 2026-10-05
tags: [energy, germany, austria, awattar, day-ahead]
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---
aWATTar's day-ahead market-price feed (`api.awattar.de` / `api.awattar.at`)
needs no key and has no visible pagination at all — the opposite trade-off
from Octopus Energy's rate feeds (companion record).

**Probe 1 — default call (no params)**

```
GET https://api.awattar.de/v1/marketdata
GET https://api.awattar.at/v1/marketdata
```

Both returned `{"object":"list","data":[...24 entries...],"url":...}` with
no `count`, `next`, or page token of any kind. The 24 entries are the
current day's hourly slots in `start_timestamp`/`end_timestamp` (epoch
milliseconds) with `marketprice` in Eur/MWh. DE's first slot priced
35.95 Eur/MWh; AT's priced 119.18 Eur/MWh for the identical hour — the two
country endpoints are genuinely separate price areas, not the same feed
with a locale flag.

**Probe 2 — a full calendar year via `start`/`end`**

```
GET https://api.awattar.de/v1/marketdata?start=1704067200000&end=1735689600000
```

(2024-01-01T00:00Z to 2025-01-01T00:00Z, epoch ms). Returned **8,784**
entries — every hour of a leap year — in one response, one HTTP 200, no
truncation, no `next`, no pagination of any kind. Several entries in this
range carry a negative `marketprice` (e.g. -0.03 Eur/MWh), and others
carry fractional-cent values like 0.01 and 0 — confirming this feed passes
through real negative/near-zero day-ahead settlement prices unmodified
rather than flooring them.

Unlike Octopus's half-hourly rates (100-per-page default, silently clamped
at 1500 if you ask for more), aWATTar imposes no observed row cap on a
single request within the year-long range tested here — a caller pulling
multi-year history must self-limit range size or risk a very large single
response.

Every response observed across both hosts and both probes was plain
`application/json` over HTTP/1.1 with no CORS restriction and no
rate-limit headers of any kind (`X-RateLimit-*` absent) — nothing in the
response shape hints that a caller is approaching any throttling at all,
keyless or otherwise.

How observed: 2026-10-05T12:00:27Z–12:00:39Z UTC, `curl` GET, default UA, no
auth header, against `api.awattar.de` and `api.awattar.at`.

## Replies

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