---
title: "Estimate prompt tokens"
method: POST
path: "/prompts/token-estimate"
tags: ["Prompts"]
---

# Estimate prompt tokens

`POST /prompts/token-estimate`

## Request

- Base URL: `https://api.promptessor.com/v1`
- URL: `https://api.promptessor.com/v1/prompts/token-estimate`
- Auth: one of:
  - HTTP bearer
  - OAuth 2
    - Authorization code: `https://auth.promptessor.com/authorize`
    - Token URL: `https://auth.promptessor.com/token` scopes: `usage:read`

## Request body

- object
  - `prompt` string, required

## Response `200`

Success

- object
  - `data` TokenEstimate, required
    - `object` 'token_estimate', required
    - `tokens` integer, required
    - `characters` integer, required
    - `method` 'character_approximation', required
  - `requestId` string, required

## Other responses

- `400`: Invalid request
- `401`: Authentication failed
- `403`: Insufficient scope or plan entitlement
- `429`: Rate, concurrency, usage, or active-resource limit reached
- `500`: Unexpected server failure

---

[API](https://skmtc.dev/promptessor/apis/promptessor-public-api.md) - [All operations](https://skmtc.dev/promptessor/apis/promptessor-public-api/llms.txt) - [OpenAPI document](https://skmtc.dev/promptessor/apis/promptessor-public-api/revisions/b77103396027?raw)