Spec Driven Development
by formulahendry
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Runs on your computer★ 440MITUpdated 14 months ago
Install
Currency Exchange
Overview
Description from the maker (original English)
Norges Bank exchange rates for AI: 38 currencies against NOK since ~1980, plus buying power
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiNot measured yet★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Other
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://currency.publifye.com/mcpRun this in your terminal
claude mcp add --transport http currency https://currency.publifye.com/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"currency": {
"url": "https://currency.publifye.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"currency": {
"type": "http",
"url": "https://currency.publifye.com/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://currency.publifye.com/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 6, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain publifye.pro (the registry checks domain ownership)
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Otheri
- More stars than 0% of the other 32531 servers in this category
- Published to the registry more recently than 48% of the other 32531 servers in this category
- Basic checks equal to or better than 100% of the other 32531 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Currency Exchange safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.2) reached the registry last month.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Spec Driven Development, Remote Desktop Commander, Reelsaw
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
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README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Currency Exchange — Norges Bank exchange rate MCP server for Claude, Cursor and any MCP client
Currency gives an AI assistant Norges Bank's daily reference rates as structured data: the rate between any two of 38 currencies on any date back to about 1980, conversion of an amount, a daily series for charting — and World Bank buying-power multipliers for pricing one list price into many markets. It runs as a hosted MCP server over HTTPS.
| Endpoint | https://currency.publifye.com/mcp |
| Transport | Streamable HTTP |
| Auth | OAuth 2.1 + PKCE (S256), DCR open · no API keys |
| Registry | pro.publifye/currency (server.json) |
| Product site | https://currency.publifye.com |
| What it solves | https://publifye.com/currency |
| Capability tools | 7 (full schemas) |
Connect
{ "mcpServers": { "currency": { "type": "http", "url": "https://currency.publifye.com/mcp" } } }Claude Code: claude mcp add --transport http currency https://currency.publifye.com/mcp, then /mcp to sign in.
The OAuth flow runs in the browser on first use, with a Publifye account. Access is granted through that sign-in only; there is no API key to create, copy or rotate. The discovery chain is the same as for the other servers: [../../docs/connect.md](../../docs/connect.md).
Where the rates come from
The rates are Norges Bank's own daily reference rates, quoted against the Norwegian krone. This service syncs and serves them. It does not compute, estimate or interpolate a rate.
That last sentence is the one that matters when an AI is asking. Norges Bank publishes once per business day, at about 16:00 CET, so weekends, Norwegian public holidays and any day the bank did not publish simply have no rate. A date with no published rate returns the series as published rather than an invented value — no carry-forward, no interpolation, no nearest-neighbour. A model that wants a number for a Sunday has to decide for itself what to do about it, which is the correct place for that decision to be made.
Cross-rates — USD→EUR, say — are derived through NOK, because NOK is the only pair Norges Bank quotes. The derivation is arithmetic on two published rates, not a third source.
The buying-power tools return two numbers, and the difference matters
get_buying_power and list_buying_power exist for one job: pricing a USD list price into a local market. They return `factor` and `raw_factor`, and they are not the same thing.
- `factor` is the recommended multiplier. It is never above 1.0 — the USD price is the maximum anyone pays regardless of how wealthy the local market is — and it is floored at 0.35 because payment fees make smaller charges uneconomic.
- `raw_factor` is the honest, uncapped measurement: GNI per capita (PPP) relative to the USA, square-root compressed. It can exceed 1.0. Norway measures about 1.10.
Applying raw_factor to a Norwegian price charges about 10% above list. That is exactly the mistake the cap exists to prevent, which is why both numbers are returned with capped and floored flags saying whether policy moved one away from the other. If in doubt, use factor.
An unknown country, missing data or an upstream outage fails safe: factor 1.0, with unknown or fallback set and the reason in note — never a silent guess.
What the tools do
Every tool is documented with its exact description, annotations and input schema — 7 in all, generated from the service's own registry, never written by hand.
| Area | The question it answers | Tools |
|---|---|---|
| [Rates and conversion](tools/rates.md) | What was this worth, in that currency, on that date? | 5 |
| [Buying power](tools/buying-power.md) | What should this USD price be in that country? | 2 |
Machine-readable: [tools.json](tools.json) carries all 7 callable tools with full JSON Schema, plus every excluded bucket listed by name so the count is auditable.
All seven are read-only and idempotent. None is marked open-world: every answer is served from data this service has already synced, so the same call on the same day gives the same answer.
What it does not do
- No live or intraday rates. One publication per business day, about 16:00 CET. A day's rates are stable once published, and therefore cacheable.
- No currency Norges Bank does not quote. 38 plus NOK, and no more.
- No invented values. No interpolation across a gap, no carry-forward into a weekend.
- No trading, no execution, no advice. These are reference rates, not dealable prices, and a reference rate is not what you will be charged by a bank or a card network.
- Not a full annual-accounts or economics source. The buying-power figures are one World Bank indicator, not a model of an economy.
Data and licence
Exchange rates are published by Norges Bank. Buying-power figures are World Bank GNI per capita (PPP), released annually, around July. Results carry reference_year — the World Bank's release year — separately from fetched_at, which is when this service last pulled it. Those are not the same thing and conflating them is how a stale figure gets reported as current.
data_origin and fallback say whether a buying-power answer came from a live pull or from the table embedded in the binary, so a degraded answer is never indistinguishable from a fresh one.
Currency Exchange is operated by Publifye AS and is not affiliated with, or endorsed by, Norges Bank or the World Bank.
Plans
A free Publifye account grants a small daily allowance on a trial; Currency Access lifts it to a monthly quota. Plans and prices can change; the current ones are always on [https://currency.publifye.com](https://currency.publifye.com), and where this page and the site differ, the site is right.