# Mercure

> AGPL-3.0 SSE hub; homepage still says MIT

**Category:** Comms  
**Pricing:** open-source  
**URL:** https://mercure.rocks  
**GitHub:** https://github.com/dunglas/mercure  
**Added:** 2026-09-03

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## The Hook

Mercure is the SSE hub whose marketing page has not caught up with its LICENSE file.

## What's Good

LICENSE file is GNU AGPLv3. SSE hub: publish with POST, subscribe with EventSource. Caddy-based, Docker/Helm, Last-Event-ID replay. Official realtime path for Symfony. Self-host the Hub.

## The Catch

Homepage still says the Hub is MIT-licensed. The LICENSE file is AGPL-3.0 — print the file. SSE, not WebSockets, not Pusher protocol. Distinct from Socket.IO and Soketi. Cloud/Enterprise exist; do not invent prices. OSS self-host is the free path.

## Verdict

AGPL SSE hub. Believe the LICENSE file, not the MIT line on the homepage.