APIstax is a platform that provides secure and reliable APIs for common business needs. It offers a collection of REST endpoints to handle day-to-day tasks, such as creating PDFs from HTML, generating EPC QR codes, checking VAT numbers, geocoding addresses, and loading consumer price indexes. The platform is designed to be simple, resilient, and accessible at all times, allowing developers to focus on their business logic rather than repetitive tasks.

What APIs does APIstax offer?

APIstax provides a wide range of APIs for common business tasks. Have a look at the APIstax APIs page to see all APIs.

What programming languages are supported?

APIstax can be used with any programming language as long as REST calls are supported. You can either use one of our SDKs by simply dropping it in, or you can generate a client from the OpenAPI document and start using it in minutes. For a complete list of supported languages, see the OpenAPI Generator documentation page.

How do I use the APIs?

APIstax APIs are REST-based and use JSON for communication. You can either use the provided client SDKs or make direct REST API calls. The platform offers comprehensive documentation, including details about available endpoints, required parameters, and sample responses.

What SDKs are provided?

APIstax provides SDKs for Java, PHP, and Quarkus, but can also be used with multiple programming languages by directly calling the REST endpoints. You can also generate a client from the OpenAPI document.

Is there a dashboard to manage my APIs?

Yes, APIstax provides a user-friendly dashboard where you can view your used quota, available credits, and manage your API keys and subscription.

How much does APIstax cost?

APIstax offers the first 100 credits for free, with no credit card required. You can start using all APIs immediately and upgrade your subscription as needed. Details about the cost of a subscription can be found on the pricing page.

How do I monitor my credit usage?

You can monitor your credit usage through the APIstax dashboard, which displays your used quota and available credits. It’s important to keep track of your credits to avoid interruptions in service.

Where can I find API documentation?

APIstax provides comprehensive API documentation that covers general topics, authentication, error handling, and OpenAPI documentation. This is your primary resource for understanding how to use the APIs.

What should I do if I encounter an error?

If you encounter an error, refer to the API documentation for error handling guidelines. Errors in the 4xx range are typically client-side issues and can be resolved by adjusting your request.

Yes, APIstax APIs are designed to be resilient and accessible 24/7, ensuring that your business operations run smoothly.

Is APIstax GDPR compliant?

Yes, APIstax is GDPR compliant and operates within the European Union. The platform is designed with privacy in mind, and no data is stored.

Do i need to subscribe per API?

No, you only need one subscription to use all currently available APIs. APIs added to APIstax in the future can be used at no additional cost.

Credits are used to simplify the billing of individual API calls. Each interface charges a certain number of credits. These are automatically deducted from your quota.

What happens to my credits in case of an error?

If a call cannot be executed due to a server-side error, nothing will be deducted from your credits.

What if i run out of credits?

There are extension packages for this, so that you can acquire additional credits. You can also acquire a package to cover peaks.

How do I get started with APIstax?

To get started, sign up and create an account on the APIstax website. You will receive 100 free credits to begin using the APIs. No credit card is required for the initial free credits. Once registered, you can access the dashboard to manage your API keys, view your quota, and start integrating the APIs into your projects.

APIstax

Blog

APIstax blog about APIs, REST endpoints and SaaS projects!

05.02.2026

Digital Sovereignty in Europe: Why European Alternatives Are Essential

It’s All About Control

In today’s interconnected world, digital sovereignty is not just a buzzword—it’s a necessity. For European businesses, relying on non-European digital infrastructure can mean compromising on data privac...

SaaS Europe Alternatives Digital Sovereignty

21.08.2025

Swiss QR Invoice: An Innovation in Payment Transactions

In today's business world, efficiency is a crucial factor. The Swiss QR invoice is an innovation that has revolutionized payment transactions. In this blog post, learn more about the Swiss QR invoice, its advantages, technical aspects, and it...

Swiss QR Invoice Invoice Processing Digital Transformation Payment Processing

14.10.2024

The Benefits of E-Invoicing Using ZUGFeRD

Digitalization is transforming how companies manage their invoicing processes. Traditional paper invoices and simple PDFs are increasingly being replaced by electronic invoices, offering significant advantages.

E-invoicing Cost savings Invoice PDF

18.09.2023

REST vs. GraphQL: Choosing the right API architecture

In the world of web development, choosing the right API architecture is critical to building efficient and scalable applications. Two popular options that developers often consider are REST and GraphQL.

REST GraphQL

12.09.2023

Generate a SDK client using OpenAPI

Using OpenAPI to generate client SDKs provides a number of benefits that can significantly improve or accelerate development processes.

OpenAPI Client SDK

10.09.2023

What is an EPC QR Code?

EPC QR Codes, also known as GiroCodes, are widely used QR codes for initiating SEPA credit transfers. It's the fastest way to share your payment information with a third party.

EPC QR Code GiroCode

22.08.2025

Introduction to Using APIstax APIs

APIstax offers a range of secure and reliable APIs designed to meet your business needs, from creating PDF files to checking VAT IDs. In this blog post, we will walk you through the initial steps of working with these APIs.

REST Client SDK

15.10.2024

ZUGFeRD and Factur-X: A Comparison of Electronic Invoicing Standards

In the digital transformation, electronic invoices play a central role. Businesses and authorities worldwide are looking for efficient, compliant, and standardized solutions to optimize invoice delivery. In Europe, two formats ha...

Invoice Processing Digital Transformation Invoice PDF

14.05.2024

The Benefits of EPC QR Codes for Businesses: Streamlined Payment Processing

In an ever-evolving world of payment transactions, EPC QR codes offer businesses an efficient and reliable solution for payment processing. By integrating EPC QR codes into their payment systems, businesses can leverage a variety of benefits that help optimize payment processes, improve user experience, and reduce operating costs.

Payment Processing User Experience EPC QR Code

15.09.2023

How to generate a PDF in my SaaS project?

There are many ways to create a PDF document, all of which have advantages and disadvantages. However, for SaaS projects, one option lends itself best.

PDF HTML to PDF SaaS

11.09.2023

Reduce time-to-market drastically

If you are building a SaaS project or a mobile application, time to market is critical. The sooner you can release new features, the better. However, quality must not suffer as a result of an early release. So what is the key to getting new software to market efficiently?

Time-to-market

100 credits for free!

The first 100 credtis are free! No credit card required! Start using all the APIstax APIs now and save countless hours of development time!