Lánamál ríkisins (Government Debt Management Iceland)

Market data for Icelandic government bonds — yields, prices, chart history. Publishes the RIKB (óverðtryggð, non-indexed) and RIKS (verðtryggð, indexed) series that lanamal.is quotes on its /markadsyfirlit pages.

API

No auth, plain JSON. Discovered by loading a /markadsyfirlit/?type=bond page in a real browser and reading the network log — the page is ASP.NET WebForms with a React island, and the bond detail panel calls:

GET https://www.lanamal.is/api/market/LoadIndexedDetail?orderbookId={ID}&lang=is

{ID} is the orderbook id in the page's own URL query string, e.g. RIKB_28_1115 (case-insensitive upstream, but the response echoes it uppercased). Requires a browser-like User-Agent — a bare curl with no headers gets blocked; a Referer pointing at the matching /markadsyfirlit page plus a normal UA is enough, no cookies/session needed.

Response encoding is UTF-16, not UTF-8 — httpx/requests auto-detect it fine from the BOM, but a raw curl dump looks like garbage without decoding.

curl -s -A "Mozilla/5.0" \
  -H "Referer: https://www.lanamal.is/markadsyfirlit/?type=bond&orderbookid=rikb_31_0124" \
  "https://www.lanamal.is/api/market/LoadIndexedDetail?orderbookId=RIKB_31_0124&lang=is"

Response shape

A one-element JSON array:

[{
  "closingYield": "7,54%", "closingPrice": "94,08",
  "bidYield": "7,55%", "askYield": "7,52%",
  "lastValidYield": "7,54%", "totalValueTraded": "94", "tradeCount": 1,
  "orderbookId": "RIKB_31_0124", "shortName": "RIKB 31 0124",
  "longName": "Óverðtryggð ríkisbréf",
  "attributes": [
    {"name": "ISIN númer", "value": "IS0000031234"},
    {"name": "Innlausnardagur", "value": "24.01.2031"},
    {"name": "Nafnvextir", "value": "5,00"}
  ],
  "chartData": {
    "header": "Ávöxtunarkr. í lok dags",
    "chartData": [["2025-08-18T00:00:00", 7.31], ["2025-08-19T00:00:00", 7.30], ...]
  }
}]

attributes is a flat list of Icelandic-labelled key/value pairs (maturity date, ISIN, coupon, issue size, etc.) — parse by name, not by list position.

Known quirk: closingYield can be stale — use chartData instead

The top-level closingYield/bidYield/askYield/lastValidYield fields reflect the last actual trade, and these bonds trade thinly — one observed response had tradeCount: 1 for the whole lookback. That trade can be days or weeks old and priced off a stale bid/ask spread, while chartData.chartData (labelled "Ávöxtunarkr. í lok dags" — end-of-day yield) is the market-maker's daily fixing, updated every business day regardless of whether a trade happened. For "what is the yield today," read the last point of chartData, not the top-level yield fields.

chartData covers roughly the trailing 12 months, daily, ascending by date — enough to diff against a recent prior value for a day-over-day change without a second request.

Bond catalog (non-indexed / óverðtryggð, RIKB)

Fetch the orderbook id list from any /markadsyfirlit/?type=bond page's links (href="/markadsyfirlit/?type=bond&orderbookid=..."). As of 2026-08, the outstanding RIKB series:

Orderbook ID	Maturity	Notes
RIKB_26_1015	Oct 2026	near maturity
RIKB_27_0415	Apr 2027
RIKB_28_1115	Nov 2028
RIKB_29_0416	Apr 2029
RIKB_31_0124	Jan 2031	closest to a 5y horizon as of 2026
RIKB_35_0917	Sep 2035
RIKB_38_0215	Feb 2038
RIKB_42_0217	Feb 2042	longest outstanding non-indexed bond — Iceland does not issue a 30y non-indexed bond, so this is the long-end proxy

Indexed (verðtryggð, RIKS) series exist too (riks_29_0917, riks_30_0701, riks_33_0321, riks_37_0115, riks_50_0915) — same API, type=bond, different id prefix. Not currently consumed by anything in this repo.

This catalog will drift — bonds mature and new ones are auctioned. Re-scan a /markadsyfirlit page's links if an orderbook id starts 404ing.

Used by

scripts/lanamal.py — fetch pulls every outstanding RIKB/RIKS orderbook from the catalog into data/processed/lanamal.csv (long format, daily fixings per bond). list rescans the market page for the live catalog.