Where do the exchange rates come from?

From the European Central Bank. The ECB publishes reference rates on working days.

Which countries does the working day check know?

It uses the public holidays of the country and, where they differ, of the state, for example Bavaria in Germany.

New

New data and date helpers

Nine small functions for everyday automation tasks: convert currencies with the reference rates of the European Central Bank, validate and format phone numbers, create and verify JSON Web Tokens, split URLs and add UTM parameters, read Outlook .msg e-mails, get the ISO calendar week and check whether a date is a working day.

Start for free Try it in the app

Key facts

Currencies: About 30 currencies with the ECB reference rates, latest or of a day in the last 90 days
Phone numbers: Valid or not, E.164, international and national format, country and type
JWT: HS256/384/512 and RS256/384/512; decode checks signature, exp and nbf
URLs: Protocol, host, domain, path, query as object, UTM parameters; build URLs with UTM parameters
E-mails: Outlook .msg to JSON with sender, recipients, body and attachments as download links
Dates: ISO 8601 calendar week; working day check with weekends and public holidays per country and state
Costs: 1 credit per call (Outlook .msg: 2)
Available via: REST API (https://api.1001fx.com) with your API key – from Make, n8n, scripts and AI agents

What you can do with it

Show prices in the customer currency
Clean phone numbers before they go into a CRM
Sign requests to other APIs or verify tokens from webhooks
Add campaign tracking to links in newsletters
Process e-mails saved from Outlook
Schedule tasks on the next working day

How it works

1
Pick the function.
2
Send a JSON body with the values.
3
Use the result in the next step.

Functions

Each function has its own page with all parameters, examples and a ready-to-copy curl command.

Function	Endpoint	Credits
Convert Currency – ECB Exchange Rates	POST /data/convertcurrency	1 credit per call
Validate Phone Number – Check and Format	POST /data/validatephonenumber	1 credit per call
Create JWT – Encode and Sign a JSON Web Token	POST /data/jwtencode	1 credit per call
Decode JWT – Read and Verify a JSON Web Token	POST /data/jwtdecode	1 credit per call
Parse URL – Get Domain, Path, Query and UTM Parameters	POST /data/parseurl	1 credit per call
Build URL with UTM Parameters	POST /data/buildurl	1 credit per call
MSG to JSON – Read Outlook Emails	POST /data/msg2json	2 credits per call
Get Calendar Week (ISO Week Number)	POST /datetime/getcalendarweek	1 credit per call
Is Working Day – Weekend and Public Holiday Check	POST /datetime/isworkingday	1 credit per call

Example

A call of https://api.1001fx.com/datetime/isworkingday. Replace YOURSECRETAPIKEY with your API key.

Is Working Day – Weekend and Public Holiday Check

curl -X POST 'https://api.1001fx.com/datetime/isworkingday' \
  -H 'X-API-KEY: YOURSECRETAPIKEY' \
  -H 'Content-Type: application/json' \
  -d '{"date":"2026-12-25","country":"DE","state":"BY"}'

Frequently asked questions

Where do the exchange rates come from?: From the European Central Bank. The ECB publishes reference rates on working days.
Which countries does the working day check know?: It uses the public holidays of the country and, where they differ, of the state, for example Bavaria in Germany.

About 1001fx

1001fx is a function API for no-code automation and AI agents, operated by efec AG in Germany. One API key gives access to more than 152 functions for files, PDFs, images, data, dates and AI. Learn how 1001fx works.