# NBP MCP

> Official Polish central bank (NBP) exchange rates, currency conversion and gold prices.

- name: ai.wondel/nbp
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 82/100 flags: no-repository
- quality: 84/100 (new)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/ai.wondel%2Fnbp
- tools: https://api.protogrid.dev/v1/servers/ai.wondel%2Fnbp/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "nbp": {
      "type": "http",
      "url": "https://mcp.wondel.ai/nbp/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 98
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-95% +updated-5d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 84/100 (new)

### protocol: 100 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- pass `protocol.list_ttl`: tool list is cacheable (ttlMs 3600000)

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: nbp_exchange_rates (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); nbp_convert (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); nbp_gold_price (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 1,610 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: n/a (weight 15)

- n/a `stability.changes`, `stability.rug_pull`: tool history recorded for 5 of the 7 days needed

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 5, about 1,610 tokens to load them all
- tool set hash: e774671f3ddf4c26593d05a4c9fd9a7b
- badge: [![protogrid quality](https://protogrid.dev/badge/ai.wondel/nbp.svg)](https://protogrid.dev/servers/ai.wondel/nbp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://mcp.wondel.ai/nbp/mcp (streamable-http, auth none, reachable true, uptime30d 0.95)

## Packages

_none_

## Tools (5)

- `nbp_convert`: 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.
- `nbp_exchange_rate`: 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_exchange_rates`: 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_price`: 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.
- `nbp_rate_series`: 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.