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Norges Bank exchange rates API and MCP — 35 currencies against NOK, daily, no interpolation

Currency Exchange· ·3 min read ·Publifye AS ·publifye

Short answer: Currency Exchange serves Norges Bank's official daily figures against the Norwegian krone — 38 series in all: 35 currencies plus the I-44 and TWI krone indices and the IMF's XDR — over a web converter, an API and MCP, so an AI assistant can convert amounts and look up historical rates with the central bank's actual figures. It fills no gaps: on a day Norges Bank publishes no rate, the service returns none.

Not everything in the estate is a Bible engine. Currency Exchange is the smallest service we run, and it exists for the least glamorous reason imaginable: a Norwegian company doing business in dollars, euros and pounds needs exchange rates constantly, and we wanted one honest source of them inside our own infrastructure.

The design is deliberately narrow:

  • The data is Norges Bank's, synced daily — 38 series against the Norwegian krone. Thirty-five are currencies; the other three are the bank's own import-weighted (I-44) and trade-weighted (TWI) krone indices and the IMF's Special Drawing Rights. We count them separately because calling an index a currency would be exactly the kind of rounding this service exists to refuse. The service computes nothing, estimates nothing, interpolates nothing. On days the central bank publishes no rate, there is no rate. That refusal to fill gaps is the feature.
  • The site shows today's rates, charts, and a converter — fast enough that checking a rate takes less time than searching for one.
  • Your AI can use it directly: like every Publifye service, it speaks MCP. Connect it and your assistant converts amounts and looks up historical rates mid-conversation, citing the actual Norges Bank figures rather than remembering approximate ones — the same grounding-beats-confidence principle the Scripture tools are built on.

Why write it up at all? Because it makes the pattern visible in miniature. Every service in this house — from the research engine down to this rate ticker — follows the same rules: one honest data source named plainly, an API and MCP surface so both people and their assistants can use it, and no number served that the source did not publish. If we hold the line on exchange rates, you can guess how we hold it on Scripture.

Access details and plans live on its store, where they can be current.

Frequently asked

Is there a free Norges Bank exchange rate API?

Norges Bank publishes its rates openly. This service syncs them daily and exposes them over a REST API and MCP with history, plus a buying-power index; access terms are on the store.

Why are there no rates on weekends and holidays?

Norges Bank fixes rates on Norwegian business days only. The service refuses to interpolate, so a missing day is reported as missing rather than estimated.

Can ChatGPT or Claude convert NOK with real rates?

Yes, once the MCP connector is added: the assistant calls the service and quotes the published figure and date instead of an approximation from memory.

Use it: converter and charts at currency.publifye.pro; MCP setup on the connector page.

Written by Jørn André Halseth, founder of Publifye AS — ten years publishing Bibles and building the presses they run on, publisher of 4,200+ Bible editions, and the author of Darash, Junifye, Lexifye and Tringine. About · Contact