General
What is Inbox?
What is Inbox?
What can I build with the Inbox API?
What can I build with the Inbox API?
- Messaging automation — Send DMs programmatically with custom workflows
- CRM integration — Sync conversations to HubSpot, Salesforce, etc.
- AI chatbots — Build intelligent auto-reply systems
- Analytics dashboards — Track engagement and conversion metrics
Which platforms are supported?
Which platforms are supported?
Is there a free tier?
Is there a free tier?
Do I need to pay to send messages?
Do I need to pay to send messages?
IDs and lookups
What's the difference between Inbox ID and Platform ID?
What's the difference between Inbox ID and Platform ID?
| ID Type | Field | Example | Use For |
|---|---|---|---|
| Inbox ID | id | l44e15irdq4db30i77cgphhx | All API operations |
| Platform ID | platformId | 1876543210987654321 | Lookups from external data |
How do I find a thread by username?
How do I find a thread by username?
@ prefix).For lookup by platform ID instead, use GET /threads/lookup with externalPlatformId and accountLinkId.How do I get someone's X user ID from their username?
How do I get someone's X user ID from their username?
Messaging
Can I send messages to new prospects?
Can I send messages to new prospects?
What are the message rate limits?
What are the message rate limits?
| Window | Limit |
|---|---|
| Per minute | 300 requests |
| Per hour | 10,000 requests |
| Per day | 100,000 requests |
What's the maximum message length?
What's the maximum message length?
Can I send images or media?
Can I send images or media?
What's the difference between quick send and standard send?
What's the difference between quick send and standard send?
| Method | Use When |
|---|---|
Quick send (POST /threads/messages) | Simple one-off messages, don’t need thread object |
Standard send (POST /threads/{id}/messages) | Multiple messages, need thread details first |
Threads and conversations
What are the inbox views?
What are the inbox views?
| View | Description |
|---|---|
default | Active conversations needing attention |
no-reply | Prospect sent the last message, awaiting your reply |
requests | New message requests |
archived | Marked as done |
How do I archive a thread?
How do I archive a thread?
done: true:Can I delete a thread?
Can I delete a thread?
done: true) instead.How do I know who sent the last message?
How do I know who sent the last message?
authorId against your account link IDs. There is no direction field on messages.Prospects
How are prospects created?
How are prospects created?
- They send you a DM
- You create a thread with them
- You use quick send to message them
How do I add notes to a prospect?
How do I add notes to a prospect?
Is prospect profile data real-time?
Is prospect profile data real-time?
isFresh, isStale, and confidence to assess data quality.Can a prospect have multiple tags?
Can a prospect have multiple tags?
Account links
How do I connect a new X account?
How do I connect a new X account?
- Go to inboxapp.com
- Navigate to Settings → Accounts
- Make sure you have the Chrome extension installed
- Click Open X and select the account to link
Can I send from multiple accounts?
Can I send from multiple accounts?
accountLinkId when sending:Are rate limits per account or per API key?
Are rate limits per account or per API key?
Team and members
How do I assign a thread to a team member?
How do I assign a thread to a team member?
Can I create team members via API?
Can I create team members via API?
How do I get unassigned threads?
How do I get unassigned threads?
Technical
What's the base URL?
What's the base URL?
https://inboxapp.com/api/v1How do I handle pagination?
How do I handle pagination?
cursorId and cursorTimestamp. Only GET /threads and GET /threads/{id}/messages are paginated — other list endpoints return all results as a flat array.How do I filter threads?
How do I filter threads?
filters parameter with bracket notation:Is there a webhook for new messages?
Is there a webhook for new messages?
Is there an official SDK?
Is there an official SDK?
Still have questions?
- Browse the API Reference for endpoint details
- Check Troubleshooting for common issues
- Visit the Help Center
- Email support at support@inboxapp.com