---
title: "Estimate Characters"
method: POST
path: "/v1/tts/lyra/estimate"
tags: ["Voice AI Beta — Lyra"]
---

# Estimate Characters

`POST /v1/tts/lyra/estimate`

Count the billable characters of a text **without creating a task**. Free. Lyra is billed 1 credit per character, so the cost equals `characters`.
> **Rate limit:** 60 requests/minute

## Request body

- object
  - `content` string, required

## Response `200`

Estimate

- TtsEstimate
  - `characters` integer — Billable characters (encoder units ≈ UTF-8 bytes — ASCII = 1, most CJK = 3, emoji = 4)

## Other responses

- `400` — Content is required
- `429` — Rate limit exceeded

---

[API](https://skmtc.dev/genaipro/apis/genaipro-api.md) · [All operations](https://skmtc.dev/genaipro/apis/genaipro-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/genaipro/genaipro-api/revisions/91f814eaecbd/schema)