Trello

Trello's API Is the Foundation Every Power-Up Is Built On. We Build on It Directly.

Trello's REST API lets any authenticated application read and write boards, lists, cards, and members, the exact same data Trello's own interface works with. You authenticate with an API key plus a token, and from there you can do nearly anything a human could do by clicking around the board, just automatically and at any volume.

What the Trello API actually lets you do

Getting access starts with grabbing an API key from Trello's developer portal, then generating a token that authorizes requests against a specific account's boards. From there, basic calls like fetching a board's cards or creating a new one are a single HTTP request.

Every Power-Up in Trello's marketplace is built on this same API underneath, so anything a Power-Up does, you can do directly without installing one.

Trello also supports webhooks on top of the API: register a callback URL against a board or card, and Trello pushes an event the moment something changes there, instead of you having to poll for it.

What building on the API actually takes

None of this is drag-and-drop. Someone has to write the integration, handle token security and rotation, and keep an eye on rate limits if volume grows. A webhook firing twice for the same event, which does happen, needs to be handled so you don't double-process it.

That's ongoing work, not a one-time setup. It's exactly the kind of thing we build and then keep running, so it's not sitting on your own dev team's plate.

Where this shows up in practice

Cards created from outside systems, fully formed

A new lead or order creates a Trello card through the API with every field already filled in, instead of someone copying details over by hand.

Webhook-driven sync, kept reliable

A Trello webhook fires the moment a card changes, and we build the listener that turns that event into the right action somewhere else, handling the duplicate-delivery edge cases so nothing double-fires.

Got an idea for what Trello should be doing automatically?

Tell us what it is, and we'll tell you what building it on the API would take.

Let's talk

Thinking about building on the Trello API yourself?

You can. Plenty of teams do. We build and maintain this kind of thing full-time so it doesn't become a side project for whoever on your team happens to know a little code. Trello's API is one example of the systems we work in; whatever your business actually runs on is fair game too.

Let's talk

Frequently Asked Questions

Is the Trello API free to use?+

Yes, the API itself is free to use once you've got a key and token. Rate limits apply, and they scale with your Trello plan rather than being a separate paid tier for the API.

Do I need to know how to code to use the Trello API?+

Yes, directly using the API means writing requests against it, usually from a script or an application. If you want the results without writing that code yourself, that's the part we handle.

What can I build with the Trello API?+

Anything that reads or writes board data: custom card creation, status syncing with another system, reporting dashboards pulled from your boards, or a client-facing view that doesn't require a Trello login at all.

Does Trello have webhooks?+

Yes. You can register a webhook against a board, list, or card, and Trello sends an HTTP request to your chosen URL the moment something there changes, rather than you having to check for updates yourself.