> ## Documentation Index
> Fetch the complete documentation index at: https://docs.m3ter.com/llms.txt
> Use this file to discover all available pages before exploring further.

# API Calls for Data Ingest

m3ter is an API-first platform. When you've created your Meters and their data-collection fields, you can use the *Submit Measurements* API call to m3ter's *Ingest API* to submit usage data into those fields:

> **POST** `/organizations/{orgid}/measurements`

For more details on the Submit Measurements API call to the Ingest API, see:

* The [Submit measurements](/api/measurements/submit-measurements) API Reference Docs page.
* The [Getting Started with API Calls](/guides/m3ter-apis/getting-started-with-api-calls) topic, which provides an example of a the call with code snippets for different languages you can copy.

<Warning>
  **Important! Request Rate and Payload Limits**. The Ingest API is designed to handle high request rates and offers high payload-per-request size. However, we impose limits on request rate and request payload size. See [m3ter APIs](/guides/m3ter-apis)
</Warning>