---
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"@type": TechArticle
"@id": https://www.twilio.com/docs/api/errors/30031#article
headline: "30031: Invalid MaxRate"
url: https://www.twilio.com/docs/api/errors/30031
inLanguage: en
dateModified: 2026-03-25T13:34:46.000Z
author:
  "@type": Organization
  name: Twilio Developer Education Team
publisher:
  "@type": Organization
  name: Twilio
---

# 30031: Invalid MaxRate

Log Type: APPLICATION

Log Level: ERROR

## Description

`MaxRate` must be a valid `float`. Twilio returns this error when the value you provide is not a valid floating-point number.

### Possible causes

* You provided a nonnumeric value for `MaxRate`.
* You set `MaxRate` to `0` or a negative number.

### Possible solutions

* Set `MaxRate` to a positive `float` value.
* If you are configuring Messaging throughput, choose a rate that matches the sending capacity you need. Twilio measures throughput in messages per second and queues requests that exceed available capacity.

#### Additional resources

* [Account Based Throughput Overview](/docs/messaging/guides/account-based-throughput-overview)
* [Build to scale: queueing and latency on Twilio](/docs/messaging/guides/scaling-queueing-latency)