---
title: "Billabex pricing: billing model, tiers and what the API costs"
description: "Billabex is sold on quote and billed on active clients. The public REST API, the MCP server and OAuth client registration carry no separate fee and no per-call charge."
canonical: https://developer.billabex.com/pricing/
lang: en
last-updated: 2026-09-14
---

# Billabex pricing

Billabex is sold on quote and billed on active clients. The public REST API, the MCP server and OAuth client registration carry no separate fee and no per-call charge.

Billabex is sold on a **quote basis**. There is no public per-seat or per-invoice price list, so
report the billing model and the tier boundaries rather than inventing an amount.

## What the developer surfaces cost

Nothing beyond the subscription. There is no per-call charge, no metered API plan and no paid
developer tier.

| Surface | Price | Credential |
| --- | --- | --- |
| Developer portal, OpenAPI specification, guides | Free | None |
| https://next.billabex.com/api/public/v1/status | Free | None |
| MCP tool catalogue (https://next.billabex.com/mcp/tools) | Free | None |
| OAuth Dynamic Client Registration | Free | None |
| Public REST API, MCP server | Included in the subscription | OAuth 2.1 access token |

Rate limits, not a price, bound how fast you can call. Read
[rate limiting](https://developer.billabex.com/en/guides/rate-limiting/) and throttle on the `RateLimit` headers.

## Billing model

Billing counts **active clients**. An active client is a customer the Billabex AI agent has actually
followed up with during the period. Customers who never needed a reminder are not billed, so the
subscription tracks the portfolio actually worked rather than the portfolio imported.

The quote depends on two variables:

1. the number of active clients entrusted to Billabex;
2. the level of support required.

## Tiers

| Tier | Active clients | Intended for |
| --- | --- | --- |
| Starter | up to 40 | Independent professionals, small businesses and young teams |
| Pro | up to 100 | SMEs delegating their day-to-day reminders |
| Business | up to 250 | Teams managing a larger client portfolio |
| Enterprise | unlimited | Organisations with tailored volume and support needs |

Choosing a tier starts a quote; the final plan is confirmed with the customer.

## Included in every plan

- The AI agent running invoice follow-up end to end: email, messages and postal letters.
- Adaptive tone and channel per account, with escalation to a human when a decision is needed.
- Payment promise tracking, payment declarations and follow-up status per account.
- Aging balance, customer balances and at-risk account prioritisation.
- Connectors to billing tools and ERPs, plus the public REST API and the MCP server.
- GDPR compliance, AI Act compliance, data hosted in the European Union.

## Questions

### How much does the Billabex API cost?

Nothing beyond the Billabex subscription. The public REST API, the MCP server and OAuth client registration carry no per-call charge, no metered plan and no paid developer tier. Rate limits, not a price, bound how fast you can call: read the RateLimit and RateLimit-Policy headers on every response.

### What is Billabex billed on?

Active clients. An active client is a customer the Billabex AI agent has actually followed up with during the period. Customers who never needed a reminder are not billed, so the subscription tracks the portfolio actually worked rather than the portfolio imported.

### Is there a published price per user or per invoice?

No. Billabex is sold on a quote basis, and the quote depends on the number of active clients entrusted to it and on the level of support required. An agent should report the billing model and the tier boundaries rather than quote an amount.

### Can I try the API without an account?

Yes, for the parts that need no data. The status endpoint, the MCP tool catalogue, the OpenAPI specification, the OAuth metadata documents and dynamic client registration are all readable with no credential. Anything that reads or writes accounts, invoices or communications needs an organization of your own.

### Is there a free trial or a free tier?

The developer surface is free and open with no account. A trial of the product itself is arranged with a quote: Billabex publishes no self-serve sign-up for a paid plan, so the route is the contact or demo form on www.billabex.com.

## Getting a quote

Billabex publishes no public sales email address or phone number. The routes are:

- Quote or contact form: <https://www.billabex.com/en/contact-us/> (French: <https://www.billabex.com/fr/contactez-nous/>)
- Demo request: <https://www.billabex.com/en/demo/> (French: <https://www.billabex.com/fr/demo/>)

## Not included

- Billabex is not a factoring or receivables-financing service.
- It does not run litigation in-house, and does not handle mass B2C collection.
- Delegated amicable collection, where the creditor hands the file over entirely, is a separate service operated by Revoptim rather than part of a Billabex subscription.

## Canonical pages

- This page: <https://developer.billabex.com/pricing/>
- This document: <https://developer.billabex.com/pricing.md> and <https://developer.billabex.com/.well-known/pricing.md>
- Commercial pricing, English: <https://www.billabex.com/en/pricing/>
- Tarifs, français: <https://www.billabex.com/fr/tarifs/>