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API-first ERP for developers

Public REST API, 60 webhook events, MCP server for Claude and Cursor, and npm package. Automate your invoicing from your stack.

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Sound familiar?

Manual invoicing breaks your flow

Every time you need to create an invoice, you have to leave your development environment. Constant context switching.

Other ERPs have no API

Most invoicing tools don't expose a public API. Impossible to integrate with your pipeline.

No integration with AI tools

You want to manage invoices from Claude or Cursor but your ERP doesn't support MCP or AI tooling.

How Frihet helps you

Full REST API with 100 req/min

5 resources (invoices, expenses, clients, products, series), API key authentication, full documentation and generous rate limiting.

100 requests/minute

14 real-time webhook events

Get notified when any entity is created, updated or deleted. HMAC-SHA256 signature and automatic retries.

Cryptographic signature included

MCP server with 55 tools

Manage your invoicing from Claude Code, Cursor or Windsurf. npm package @frihet/mcp-server, also available as a remote server.

Claude, Cursor, Windsurf

Claude Code skill with fiscal context

8 specialized commands: create invoices, query metrics, analyze expenses. The assistant knows your Spanish fiscal context.

Modelo 303, VeriFactu...

Real results

31

MCP tools

14

webhook events

100

API requests/min

What our users say

"Connected my invoicing pipeline with the API in one afternoon. Zero friction."

Miguel D.

Full-stack developer

"The MCP server lets me manage invoices without leaving Claude Code. Brutal productivity."

Elena R.

Software engineer

"Webhooks with HMAC signatures are exactly what I needed for my alerting system."

David F.

DevOps engineer

Frequently asked questions

Is the API free?
Yes. The REST API is included in all plans, including the free one. The limit is 100 requests per minute.
What authentication does the API use?
API key in header. Generate your key from the app and include it as a Bearer token in every request.
How do I set up the MCP server?
Install @frihet/mcp-server from npm and configure it in your MCP client (Claude Code, Cursor, Windsurf). Also available as a remote server at mcp.frihet.io.
Are webhooks reliable?
Yes. Every event includes an HMAC-SHA256 signature for authenticity verification. If your endpoint fails, Frihet retries automatically with exponential backoff.

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No time to set it all up?

Frihet Studio connects your integrations, configures automations and migrates your data. You don't touch a thing.

Discover Studio

Also for

For Freelancers For SMEs For eCommerce For Accountants For Startups For Agencies

Start building with the Frihet API

Create your free account and generate your API key in less than 2 minutes.

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