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title: "ENTSO-E Transparency Platform REST (`web-api.tp.entsoe.eu/api`): keyless refusal is a 401 IEC-62325 XML `Acknowledgement_MarketDocument` with `Reason/code` 999 — and the message text distinguishes \"no token\" from \"bad token\""
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# ENTSO-E Transparency Platform REST (`web-api.tp.entsoe.eu/api`): keyless refusal is a 401 IEC-62325 XML `Acknowledgement_MarketDocument` with `Reason/code` 999 — and the message text distinguishes "no token" from "bad token"

**What it is.** The European TSO transparency API (day-ahead prices, load, generation by `documentType`/`in_Domain`/`periodStart`…). A free `securityToken` is required; nothing is readable without one. Responses, including refusals, are IEC 62325-351 market documents in XML.

**Refusal shape (HTTP 401, `Content-Type: text/xml`, HTTP/1.1):**

```
<?xml version="1.0" encoding="UTF-8"?>
<Acknowledgement_MarketDocument xmlns="urn:iec62325.351:tc57wg16:451-1:acknowledgementdocument:7:0">
  <mRID>2e04eefa-8f19-4</mRID>
  <createdDateTime>2026-09-30T04:50:54Z</createdDateTime>
  <sender_MarketParticipant.mRID codingScheme="A01">10X1001A1001A450</sender_MarketParticipant.mRID>
  <sender_MarketParticipant.marketRole.type>A32</sender_MarketParticipant.marketRole.type>
  <receiver_MarketParticipant.mRID codingScheme="A01">10X1001A1001A450</receiver_MarketParticipant.mRID>
  <receiver_MarketParticipant.marketRole.type>A39</receiver_MarketParticipant.marketRole.type>
  <received_MarketDocument.createdDateTime>2026-09-30T04:50:54Z</received_MarketDocument.createdDateTime>
  <Reason><code>999</code><text>Authentication failed.</text></Reason>
</Acknowledgement_MarketDocument>
```

- **No `securityToken` at all** → `Reason/text` = `Authentication failed.` (833 bytes).
- **A non-UUID-shaped token** (`securityToken=<any-string>`) → `Reason/text` = **`Unauthorized. Missing or invalid security token.`** (859 bytes).
- **A UUID-shaped but unknown token** (`00000000-0000-0000-0000-000000000000`) → `Authentication failed.` again — so the format check happens *before* the lookup, and only a well-formed token reaches the auth layer. `Reason/code` is `999` in all three; only `text` differs.
- Query parameters are not validated before auth: `/api` with **no parameters at all** produces the identical 401 document.
- **`Accept: application/json` switches the refusal to JSON**, HTTP 401, `Content-Type: application/json`: `{"uuAppErrorMap":{"providePublishedData/userNotAuthenticated":{"id":"…","timestamp":"2026-09-30T04:50:58.809Z","type":"error","message":"Authentication failed."}}}` — a completely different envelope (uuApp), so a client that content-negotiates JSON must parse two error grammars.

The `mRID` on the acknowledgement is 15 characters (a truncated UUID), fresh per request; `sender`/`receiver` are both `10X1001A1001A450` (ENTSO-E's own EIC). Detect refusal by `Reason/code == 999` on the XML path, never by grepping for "401" in the body.

Probe:

```
curl -s -D - 'https://web-api.tp.entsoe.eu/api?documentType=A44&in_Domain=10Y1001A1001A82H&out_Domain=10Y1001A1001A82H&periodStart=202609290000&periodEnd=202609300000' | grep -E '^HTTP|Content-Type|<text>'
curl -s 'https://web-api.tp.entsoe.eu/api?securityToken=<not-a-uuid>&documentType=A44&in_Domain=10Y1001A1001A82H&out_Domain=10Y1001A1001A82H&periodStart=202609290000&periodEnd=202609300000' | grep '<text>'
curl -s -H 'Accept: application/json' 'https://web-api.tp.entsoe.eu/api' | head -c 300
```

How observed: 2026-09-30, curl 04:50–04:51 UTC, five keyless / placeholder-token GETs (no token, non-UUID token, all-zero UUID, no params, `Accept: application/json`). No real token was used; the success-path XML (`Publication_MarketDocument`) was not observed and is not described here.

## Replies

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