NBP MCP
ai.wondel/nbpwondel.aistreamable-httpv1.0.0Scanned
Official Polish central bank (NBP) exchange rates, currency conversion and gold prices.
5 tools: 1 do something that can't be undone, 2 change things and 2 only read.
- Reads private data · 3
- Reads text others write · 0
- Can send data out · 1
- No findings
Anlyon alternative
3 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
5 tools
Can't be undone 1Claude Code: ask
nbp_convertConvert an amount between two currencies using official NBP mid rates, cross-rated through PLN.Can send data outNo findings
Why it is in this group
- The name "nbp_convert" says "convert": a word for a change.
- The input addresses people (input.to): what it sends cannot be taken back.
What it can reach
- outboundThe input takes a destination (input.to): what the tool writes goes there.
Description, as the server wrote it Convert an amount between two currencies using official NBP mid rates, cross-rated through PLN. Supports PLN and every currency NBP quotes: table A is used first and table B (exotic currencies, published Wednesdays) is consulted automatically for codes A doesn't carry — each side of the response shows the rate, table and effectiveDate used. Latest rates by default, or historical with date. NBP publishes only on Polish business days — on weekends/holidays the request falls back to the most recent preceding publication; effectiveDate in the response shows the date actually used.
Changes things 2Claude Code: ask
nbp_exchange_rateGet the official NBP rate for one currency against PLN (Polish złoty) — the latest rate by default, or the rate in force on a historical date.Reads private dataNo findings
Why it is in this group
- The description's first verb is "get": a word for reading.
- The input takes a statement or command to run (input.code), which can change anything it can reach.
What it can reach
- private-dataThe input names a table (input.table), and the tool reads: it reads databases.
Description, as the server wrote it Get the official NBP rate for one currency against PLN (Polish złoty) — the latest rate by default, or the rate in force on a historical date. Tables 'a'/'b' return the mid rate; table 'c' returns bid/ask. NBP publishes only on Polish business days — on weekends/holidays the request falls back to the most recent preceding publication; effectiveDate in the response shows the date actually used. Use nbp_rate_series for a multi-day history.
nbp_rate_seriesGet a historical time series of NBP rates for one currency against PLN: either the last N published quotes (last_n, default 30, max 255) or an explicit start_date/end_date window (…Reads private dataNo findings
Why it is in this group
- The description's first verb is "get": a word for reading.
- The input takes a statement or command to run (input.code), which can change anything it can reach.
What it can reach
- private-dataThe input names a table (input.table), and the tool reads: it reads databases.
Description, as the server wrote it Get a historical time series of NBP rates for one currency against PLN: either the last N published quotes (last_n, default 30, max 255) or an explicit start_date/end_date window (max 93 days per query — NBP's hard limit; chain calls for longer spans). Quotes exist only for publication days: business days for tables 'a'/'c', Wednesdays for 'b'. Data starts 2002-01-02.
Only reads 2Show 2 read-only tools
nbp_exchange_ratesGet a full NBP (Polish central bank) exchange-rate table against PLN — the latest published table by default, or the table in force on a historical date.Reads private dataNo findings
Why it is in this group
- The description's first verb is "get": a word for reading.
What it can reach
- private-dataThe description's first sentence says "get" and "table": it reads databases.
- private-dataThe input names a table (input.table), and the tool reads: it reads databases.
Description, as the server wrote it Get a full NBP (Polish central bank) exchange-rate table against PLN — the latest published table by default, or the table in force on a historical date. NBP publishes only on Polish business days — on weekends/holidays the request falls back to the most recent preceding publication; effectiveDate in the response shows the date actually used. Rates data starts 2002-01-02.
nbp_gold_priceGet the official NBP gold price — PLN per 1 gram of 1000-fineness gold.No findings
Why it is in this group
- The description's first verb is "get": a word for reading.
Description, as the server wrote it Get the official NBP gold price — PLN per 1 gram of 1000-fineness gold. Latest price by default; or one historical date; or the last N quotes (last_n, max 255); or a start_date/end_date range (max 93 days per query). Published every business day. NBP publishes only on Polish business days — on weekends/holidays the request falls back to the most recent preceding publication; effectiveDate in the response shows the date actually used. Gold data starts 2013-01-02.
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged untrusted-input.
- Reads private data3
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write0
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out1
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http nbp https://mcp.wondel.ai/nbp/mcpclaude mcp add --transport http nbp https://mcp.wondel.ai/nbp/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__nbp__nbp_exchange_rates",
"mcp__nbp__nbp_gold_price"
],
"ask": [
"mcp__nbp__nbp_exchange_rate",
"mcp__nbp__nbp_rate_series",
"mcp__nbp__nbp_convert"
],
"deny": []
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as nbp. Review it before you use it.
Capability tags behind 4 rules
- mcp__nbp__nbp_exchange_rates private-data
- mcp__nbp__nbp_exchange_rate private-data
- mcp__nbp__nbp_rate_series private-data
- mcp__nbp__nbp_convert outbound
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/ai.wondel/nbp/verify?hash=fcdb2ba07afe853b0b2ae5fde30dd222f6b04e1ca0c01d6676f0a04560b362a9" | jq -e '.changed == false'Pinned hash fcdb2ba07afe, from Nov 2, 2026, 13:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/ai.wondel/nbp/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
Badge
[](https://anlyon.dev/servers/ai.wondel/nbp)Source: MCP Registry. Synced Nov 2, 2026, 13:17 UTC.