Trello APIConnect Trello without building on its API
Trello has a REST API. Self-serve for any Trello user: create a Power-Up in the Power-Up admin portal to generate an API key. If you're reading the docs because you need Trello to talk to the rest of your stack, Caddi does that without you writing or maintaining integration code: you show it the job once, and it runs it across Trello and your other tools.
- APIREST (JSON)
- AuthAPI key + user token
- AccessSelf-serve
What the Trello API gives you
- Type
- REST (JSON)
- Authentication
- API key + user token (delegated authorization flow) or OAuth 1.0a
- Who can get access
- Self-serve for any Trello user: create a Power-Up in the Power-Up admin portal to generate an API key.
- What it covers
- Boards, lists, cards, checklists, labels, members, organizations (workspaces), actions, and webhooks.
- Limits
- 300 requests per 10 seconds per API key and 100 requests per 10 seconds per token, with /1/members/ limited to 100 requests per 900 seconds.
Official docs: developer.atlassian.com. Checked September 2026. Vendors change access terms, so confirm with Trello before you build.
Building on the Trello API vs. having Caddi run it
| The job | Build it on the API | With Caddi |
|---|---|---|
| Getting access | Register an app, get Trello credentials, and manage tokens and refreshes. | Connect your Trello account once. Caddi holds the connection. |
| Writing the integration | A developer maps fields, handles pagination, retries and rate limits, and writes the sync. | You show Caddi the Trello task the way you'd train a new hire. It writes verified code for it. |
| Steps the API doesn't cover | Screens with no endpoint stay manual, or need a separate RPA tool. | Caddi uses a secure, audited browser session where there's no API, in the same automation. |
| The other systems in the loop | Each extra tool is another API, another set of credentials, another integration to own. | One automation runs across all the tools the job touches. |
| Keeping it running | Someone owns the code when the API version, fields or your process change. | Every automation is reviewed before it runs in production, and every run is logged. |
Building on the API is the right call when you have engineers and the integration is your product. When the goal is getting Trello work off someone's desk, the build is the slow part.
What teams usually want the Trello API for
Docketed Mail Uploads
Caddi cross-checks docketed mail items, uploads the required documents to the board mail folder, and archives processed files.
Matter Transfer Reassignment
Caddi identifies unprocessed case transfers and reassigns matters across task and tracking systems, reducing manual cross-system handoff updates.
SOL Tracker Updates
Caddi pulls matter tracking details and updates the statute of limitations tracker sheet alongside Trello boards.
Inbound-to-card
Caddi reads inbound work-request emails and opens the matching Trello card with the right list, labels, and attachments.
Trello API questions
Does Trello have an API?
Yes. Trello has a REST API, authenticated with API key + user token (delegated authorization flow) or OAuth 1.0a. The official documentation is at https://developer.atlassian.com/cloud/trello/rest/.
How do I get access to the Trello API?
Self-serve for any Trello user: create a Power-Up in the Power-Up admin portal to generate an API key.
Does the Trello API have rate limits?
300 requests per 10 seconds per API key and 100 requests per 10 seconds per token, with /1/members/ limited to 100 requests per 900 seconds.
Can I connect Trello to my other tools without writing code against its API?
Yes. With Caddi you show the Trello task once, the way you'd train a new hire, and Caddi builds it as verified code that runs across Trello and the other tools the job touches. Where a step has no API, Caddi uses a secure, audited browser session in the same automation.
Do I need a developer to automate Trello with Caddi?
No. There is no integration code for you to write or maintain. Every automation Caddi builds for Trello is reviewed before it runs in production, and every run is logged.
Connect Trello without the build.
Drop your work email and pick a time. We'll show you Caddi running your Trello workflow end to end.