Limits

Limits per project unless stated. Errors name the limit they hit; see Errors.

Account and keys

What	Limit
Projects per account	3
Active keys per project	20
API requests	600 per minute per key

Inbox

What	Limit
Webhook body	5 MB
Webhook requests	50 per second per source, 100 per project
Inbound email	25 MB each, 500 per 24 hours
inbox_list page	20 by default, 100 max
inbox_wait	45 seconds by default, 120 max; 10 at once per key, 25 per project
Lease	300 seconds by default, 30 to 3,600
Retries	min(30 s × 2^(n−1), 1 h) after the n-th failed attempt; dead after 5 attempts
Route callbacks	retried after 1 m, 5 m, 30 m, 2 h, 12 h
Payload retention	30 days
Deduplication	30 days by provider id, 24 hours by body hash

Requests

What	Limit
Wait in the call	45 seconds by default, 120 max
Expiry	24 hours by default, 1 minute to 7 days
Pending requests	50
Requests per day	200 per 24 hours
details	4,000 characters
options	5, up to 40 characters each

Disk

What	Limit
Space	1 GB across key-value, task state, files and inbound payloads
Key-value entries	10,000, task state included
Key-value value, task state	256 KB
Key or path	512 bytes
file_put inline	1 MB
file_put upload	100 MB; the upload URL lasts 15 minutes, 3 open uploads per path
file_url	1 hour by default, 60 seconds to 7 days
Downloads	5 GB per calendar month (UTC)
state_save note	500 characters
ttl_seconds	365 days

Sending

What	Limit
Emails	50 per 24 hours, 1,000 per calendar month (UTC); one per recipient
Recipients per call	50
Attachments	10 files, 10 MB in total
Subject	255 characters
Body	256 KB for text, 256 KB for html
Automatic block	more than 0.1% complaints, or more than 5% bounces once 20 emails are sent, over 7 days