---
title: "Monthly FX aggregates (group 133)"
method: GET
path: "/api/v1/riksbank/fx-monthly"
tags: ["Central Banks & Monetary"]
---

# Monthly FX aggregates (group 133)

`GET /api/v1/riksbank/fx-monthly`

Monthly averages of SEK fixings (SWEA group 133). SWEA does not enumerate series for this group; when observations are empty, compute monthly averages from `/riksbank/fx` history.

## Response `200`

Monthly aggregate observations when exposed by SWEA; otherwise an explanatory note.

- EnvelopeRiksbankFxMonthlyData
  - `data` RiksbankFxMonthlyData, required — Envelope body for /riksbank/fx-monthly - group 133 (monthly averages).
    - `groupId` integer, required — SWEA group identifier (133 = monthly aggregate).
    - `count` integer, required — Number of observations returned.
    - `observations` RiksbankGroupObservation[], required — Monthly aggregate fixings (averages of daily observations).
      - `seriesId` string, required — SWEA series identifier.
      - `date` string, required — Observation date (YYYY-MM-DD).
      - `value` number, nullable, required — Observation value.
    - `note` string, nullable — Informational note. SWEA group 133 is an aggregate without enumerated series.
  - `meta` SugraMeta, required — Metadata attached to every /api/v1/* response envelope.
    - `endpoint` string, required — Requested endpoint path.
    - `data_time` string, required — ISO 8601 UTC timestamp of the source data, not of the request.
    - `response_time` string, required — ISO 8601 UTC timestamp when this response was produced.
    - `provider` string, required — API name and version.
    - `source` string, nullable — Identifier of the primary upstream source used for this response.
    - `attribution` string, nullable — Human-readable attribution mandated by an upstream source (e.g. a securities regulator or self-regulatory organization). Present only on responses whose source requires the owner and source to be clearly identified. Do not remove or alter it when using the response.
    - `fallback_used` boolean, nullable — True when the primary source failed and a fallback produced the data.
    - `fallback_chain` string[], nullable — Ordered list of sources attempted, in the order they were tried.
    - `cached` boolean, nullable — True when this response was served from the internal cache.
    - `stale` boolean, nullable — True when the cached response was returned after the upstream rate-limited or errored. Clients can use this to detect degraded data.

## Other responses

- `401` — Missing or invalid `x-api-key` header. JSON body with a stable `code` distinguishing `missing_api_key` (no header sent) from `invalid_api_key` (header sent, key not accepted); any other 401 source carries the generic `unauthorized` with its detail as `reason`. Plus `hint`. `plan` is always null on 401 - an unauthenticated request has no plan; quota exhaustion is 429, not 401.
- `429` — Daily rate limit exceeded. Check `X-RateLimit-Reset` for the next window.
- `503` — Upstream source is temporarily unavailable. Retry after a short delay.

---

[API](https://skmtc.net/sugra/apis/sugra-api.md) · [All operations](https://skmtc.net/sugra/apis/sugra-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/sugra/sugra-api/versions/4c4530760ba1/schema)