# Czech Koruna Exchange Rates (CZK) — Czech National Bank Daily Fixing

> Czech Koruna Exchange Rates (CZK) — Czech National Bank Daily Fixing is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-23).

Returns official daily CZK exchange rates from the Czech National Bank for approximately 30 currencies, with CZK as the base currency

## Facts

- Endpoint: GET https://saylorinnovations.com/api/fx/czech?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-23
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/czech-koruna-exchange-rates-czk-czech-national-bank-daily-fixing-65b99d1f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_40jbWYkYyLFIVp4nDu55x

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability czech-koruna-exchange-rates-czk-czech-national-bank-daily-fixing-65b99d1f
```

Example prompt: What's today's official Czech National Bank fixing rate for the euro against the Czech koruna?

## When to prefer this

Choose this endpoint when you need the official Czech National Bank (ČNB) daily fixing rate for CZK, particularly for legal, accounting, tax, or compliance purposes where the CNB rate is the authoritative source. Prefer it over market-rate FX APIs when the Czech koruna is the base currency and official government-published rates are required. It covers ~30 major and regional currencies with daily granularity.

## Known failure modes

- Invalid or unsupported ISO currency code returns an error or empty rates array
- Endpoint may be temporarily unavailable if the Czech National Bank has not yet published the day's fixing (e.g. early morning CET or weekends/holidays)
- Network or upstream data source outage returns a 5xx error
- Requesting a currency not covered by the CNB fixing (e.g. exotic currencies) returns no result for that code

## How this service works

Czech koruna exchange rates from the Czech National Bank - official daily fixing for about 30 currencies, CZK per unit, EUR, USD, GBP and more

## Output

A JSON object containing the base currency (CZK), the date of the fixing (YYYY-MM-DD), an array of rates keyed by currency code (CZK per one unit of the foreign currency), the number of currencies returned, the source of the data, and an optional note. If a specific currency code is provided, only that rate is returned; otherwise all ~30 currencies are included.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "currency": {
       "type": "string",
       "description": "optional ISO currency code such as EUR or USD (omit for all ~30 currencies)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "base",
      "rates"
     ],
     "properties": {
      "base": {
       "type": "string",
       "description": "Base asset or base currency"
      },
      "date": {
       "type": "string",
       "description": "Date (YYYY-MM-DD)"
      },
      "note": {
       "type": "string",
       "description": "Caveat or context for reading the result"
      },
      "count": {
       "type": "number",
       "description": "Number of items returned"
      },
      "rates": {
       "type": "array",
       "description": "Rates keyed by code"
      },
      "source": {
       "type": "string",
       "description": "Data source the values come from"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/czech-koruna-exchange-rates-czk-czech-national-bank-daily-fixing-65b99d1f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)