Limits

Alpha

This feature is in alpha. APIs and behavior may change without notice. Not recommended for production use.

Technical limits for EdgeBase Push Notifications.

Device Tokens

Limit	Value	Notes
Max devices per user	10	Oldest token is removed when exceeded
Max metadata per token	1,024 bytes	Custom metadata attached to device registration

Sending

Limit	Value	Notes
Token chunk size (multicast)	500 tokens per batch	Server auto-chunks larger sends internally
send-many	Multiple user IDs	Each user's tokens are resolved and batched. Maximum 10,000 user IDs per request.
send-to-topic	All topic subscribers	Topic subscriptions managed by FCM
broadcast	All registered users	Service Key required

Topics

Feature	Notes
subscribe / unsubscribe	JWT-authenticated (client SDK)
Topic storage	Managed by FCM directly

Authentication

Endpoint	Auth Required
register / unregister	JWT
subscribe / unsubscribe (topics)	JWT
send / send-many / send-to-token	Service Key
send-to-topic / broadcast	Service Key
tokens / logs	Service Key

Those server-side push endpoints are available across all Admin SDKs.

Rate Limiting

Group	Default	Key	Configurable
global	10,000,000 req / 60s	IP	Yes

Push endpoints use only the global rate limit group.

Platform Requirements

EdgeBase Push requires a Firebase Cloud Messaging (FCM) Service Account for delivery:

Platform	Push Service	Config
Android	FCM	PUSH_FCM_SERVICE_ACCOUNT env variable
iOS	APNs (via FCM)	FCM project config + APNs key
Web	FCM	FCM project config + VAPID key