# Meter AI token usage and prepaid Lago credits: n8n workflow

> Started by another system calling it. It calls services over plain HTTP rather than through connectors.

Source: https://millionrounds.com/workflow/meter-ai-token-usage-and-prepaid-lago-credits (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Money admin](https://millionrounds.com/workflows?category=Money+admin#library)

# Meter AI token usage and prepaid Lago credits

Started by another system calling it. It calls services over plain HTTP rather than through connectors. 15 steps, 2 branches: a working afternoon to understand properly.

Medium

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fmeter-ai-token-usage-and-prepaid-lago-credits)

**15 steps** Medium: a working afternoon

**2** Branches: places the flow splits

**0** Loops or waits

**0** Services by connector: it calls them over plain HTTP

## The flow

Starts it 4 Logic 8 Service 3

The steps in the order they run, from what starts it.

- 1 **When AI Usage Posted** Webhook *Starts it*
- 2 **Normalize AI Usage Data** Code *Logic*
- 3 **If AI Usage Valid** If *Logic*
- 4 **Compute Usage Fees** Lago *Service*
- 5 **Send Validation Error Response** Respond To Webhook *Starts it*
- 6 **Total Estimated Fees** Code *Logic*
- 7 **Retrieve Prepaid Wallet** Lago *Service*
- 8 **Determine Credit Level** Code *Logic*
- 9 **Transmit Usage Event** Lago *Service*
- 10 **Create Metering Receipt** Code *Logic*
- 11 **Check Low Credit Alert** If *Logic*
- 12 **Setup Low Credit Alert** Set *Logic*
- 13 **Setup Healthy Credit Response** Set *Logic*
- 14 **Send Low Credit Response** Respond To Webhook *Starts it*
- 15 **Send Healthy Credit Response** Respond To Webhook *Starts it*

## How it's built

- **Starts on:** Another system calling it
- **Steps:** 15, with 2 branches
- **Size:** Medium: a working afternoon
- **Connects to:** Nothing by connector; it calls services over plain HTTP
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account. You connect your own accounts after importing it; none are included.

What starts it?

It starts on another system calling it.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 15 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 15 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fmeter-ai-token-usage-and-prepaid-lago-credits)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Workflows like it

Also money admin, with the same services where possible, closest in size first.

- [**Chase unanswered sales quotes with Google Sheets and Gmail** 15 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/chase-unanswered-sales-quotes-with-google-sheets-and-gmail)
- [**Classify invoices and route them to Google Drive folders** 15 steps · Google Drive, Slack](https://millionrounds.com/workflow/classify-invoices-and-route-them-to-google-drive-folders)
- [**Generate PDF invoices with Google Sheets** 15 steps · Airtable, Google Drive](https://millionrounds.com/workflow/generate-pdf-invoices-with-google-sheets)
- [**Google Sheets and QuickBooks expenses automation template** 15 steps · Google Sheets](https://millionrounds.com/workflow/google-sheets-and-quickbooks-expenses-automation-template)
- [**Match vendor invoices with POs and Gmail** 15 steps · Gmail, Google Sheets](https://millionrounds.com/workflow/match-vendor-invoices-with-pos-and-gmail)
- [**Process invoice emails to Zoho Books with Gmail and Parseur** 15 steps · Gmail, Google Drive](https://millionrounds.com/workflow/process-invoice-emails-to-zoho-books-with-gmail-and-parseur)