beanprice-bazg

A beanprice price source for the official Swiss BAZG/EZV daily exchange rates (Bundesamt für Zoll und Grenzsicherheit, formerly Eidgenössische Zollverwaltung).

These are the rates the Swiss tax administration (ESTV) accepts for converting foreign-currency amounts on VAT returns, quoted directly in CHF — which is exactly what a CHF-reporting company needs, and what the ECB feed does not provide.

Install

This package is developed inside the quints monorepo and isn't published to PyPI separately (only quints is). Use it from a clone of the repo, or vendor src/beanprice_bazg/ into your own project.

Usage

Tickers are ISO currency codes; the quote currency is always CHF ("1 <ticker> = X CHF"):

2024-01-01 commodity USD
    price: "CHF:beanprice_bazg/USD"

2024-01-01 commodity EUR
    price: "CHF:beanprice_bazg/EUR"

bean-price -e CHF:beanprice_bazg/USD          # latest
bean-price --update --inactive main.bean      # backfill / refresh the series

Behaviour

• Daily, fully historical. get_historical_price / get_prices_series hit …/api/xmldaily?d=YYYYMMDD, which serves any past date.
• Weekends & holidays resolve to the last published rate; series results are de-duplicated by the actual rate date, giving a clean business-day series.
• Per-100 quotes (e.g. 100 EGP) are normalised to a per-unit CHF price.
• Monthly averages are intentionally not supported: the BAZG monthly-average endpoint only ever returns the current month, so it cannot be backfilled by an automated tool. Use the daily rate consistently instead.

Develop / test

uv sync
uv run pytest                 # offline unit tests (HTTP mocked)
BAZG_LIVE=1 uv run pytest     # also runs the live smoke test

License

GPL-2.0-only