Operations · Workflow template

Custom API endpoint backed by a workflow

Expose a webhook URL that runs your workflow synchronously and returns a custom JSON response. An API in 10 minutes.

Build this in Carly Or copy the prompt ↓

The workflow at a glance

Trigger

Webhook

POST

LLM

Process request

Tool

Run logic

Action

Return JSON

sync

How this workflow works, step by step

1 Trigger Webhook

Any system that can POST to a URL kicks this off — webhook. Carly accepts the payload and starts the workflow.
2 LLM Process request

An LLM step does the thinking: process request. Carly picks the right model for the job and you can swap models per step if you need to.
3 Tool Run logic

Carly pulls live data from the connected tool — "Run logic." Whatever's needed for the next step is fetched fresh, not cached.
4 Action Return JSON

Carly returns a synchronous JSON response. Whatever called the workflow gets the result inline.

When to use this template

You want this work to happen consistently without anyone remembering to do it.
You're already using tools Carly connects to, and the manual version of this is eating real minutes a week.
You want a visible canvas you can audit and edit — not a black-box agent doing things you can't see.

When not to use it

This task only happens once or twice a month — the setup cost won't pay back.
The decision in the middle of the flow needs human judgment every single time, not just on edge cases.
Your stack doesn't include any of the apps above and you don't want to wire a generic HTTP step.

Build it in 10 minutes — copy this prompt

Paste this in an email to and Carly will build the workflow for you.

Hey Carly — please build me this workflow.

Name: Custom API endpoint backed by a workflow

What it should do:
Expose a webhook URL that runs your workflow synchronously and returns a custom JSON response. An API in 10 minutes.

Steps:
1. Trigger: Webhook (POST)
2. LLM: Process request
3. Tool: Run logic
4. Action: Return JSON (sync)

Tools to wire up: (your call — pick the right ones)

Set it live once you've got it working. Thanks!

Or open the dashboard →

Questions teams ask before building this

How long does this workflow take to set up?

Most teams have "Custom API endpoint backed by a workflow" running in under 10 minutes. Copy the prompt on this page into an email to carly@usecarly.com and Carly wires the workflow together for you, including authenticating the tools you need.

Can I edit this template after Carly builds it?

Yes. Every workflow lives on the Carly canvas where you can rename steps, change conditions, swap LLM models, add filters, and re-route branches. Templates are starting points, not locked recipes.

What if I use a different tool than the ones in this template?

Carly connects to 200+ tools, plus a generic HTTP node for any API that doesn't have a native integration. Tell Carly your stack when you send the prompt and she'll pick the right connectors.

Does this run automatically once it's built?

Yes. The trigger at the start of the workflow fires automatically — on a schedule, on an inbound email, on a webhook, on a calendar event, whatever this template specifies. Carly handles the listening; you only step in when a step is gated on you.