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POST
/
api
/
stealthify
Writer & Humanizer
curl --request POST \
  --url https://stealthgpt.ai/api/stealthify \
  --header 'Content-Type: application/json' \
  --header 'api-token: <api-token>' \
  --data '
{
  "prompt": "<string>",
  "rephrase": true,
  "tone": "<string>",
  "mode": "<string>",
  "qualityMode": "<string>",
  "model": "<string>",
  "business": true,
  "isMultilingual": true,
  "detector": "<string>",
  "outputFormat": "<string>"
}
'
{
  "result": "<string>",
  "howLikelyToBeDetected": 123,
  "remainingCredits": 123,
  "wordsSpent": 123,
  "billingMode": "<string>",
  "meteredChargedCredits": 123,
  "tokensSpent": 123,
  "totalTokensSpent": 123,
  "systemTokensSpent": 123
}

Documentation Index

Fetch the complete documentation index at: https://docs.stealthgpt.ai/llms.txt

Use this file to discover all available pages before exploring further.

The /api/stealthify endpoint is the core of the StealthGPT API, allowing you to generate new content or rephrase existing text to be undetectable by AI detection tools.
For integrations that cannot keep a request open while humanization runs, use the async POST /api/stealthify/runs flow. This synchronous endpoint remains unchanged for existing API clients.

​
Request Parameters

​
api-token
string
required
Your unique API authentication token. You can find this in your StealthGPT dashboard under the API Key tab.
​
prompt
string
required
The text prompt for content generation or the text to be rephrased. Maximum 3,000 words per request.
​
rephrase
boolean
required
Set to true to rephrase the provided prompt text, or false to generate new content based on the prompt
​
tone
string
Controls the style and complexity of the generated content
​
mode
string
Indicates the detail level of the response
​
qualityMode
string
default:"quality"
Controls rewrite quality vs speed.
​
model
string
default:"heavy"
Selects the humanizer model. If omitted, requests use heavy.
​
business
boolean
default:"false"
deprecated
Removed. The 10x premium engine has been replaced by the Stealth Agent endpoint, which runs a full research → write → humanize pipeline (with optional fact-checking and image generation).The business field is still accepted in the request body for backward compatibility, but it has no effect: all /api/stealthify requests run on the standard engine and are billed at the standard rate. For premium-quality, long-form output, send your prompt to POST /api/stealthify/agent instead. See the Stealth Agent overview and guide.
​
isMultilingual
boolean
default:"true"
Controls how non-English input is returned after processing. When true (default), non-English input will be kept in its localized language. When false, non-English input will be returned in English.
​
detector
string
default:"turnitin"
deprecated
Deprecated. Retained for backward compatibility only and has no effect on model behavior. You can safely omit this field; all requests use the same model.
​
outputFormat
string
default:"text"
Controls the formatting of the returned content.

​
Response

​
result
string
The generated or rephrased content
​
howLikelyToBeDetected
number
Human-likeness score from 0 to 100. Higher is better: a higher score means the content reads as more human and is less likely to be flagged as AI; a lower score means it is more likely to be detected as AI-generated. (The field name is historical — treat a higher value as the better result.)
​
remainingCredits
number
Number of words remaining in your account after this request
​
wordsSpent
number
New: Replaces tokensSpent. Number of words used for the content generation or rephrasing.
​
billingMode
string
Whether the request was billed from prepaid words (prepaid) or pay-as-you-go metered billing (payg).
​
meteredChargedCredits
number
If billed via pay-as-you-go, the number of words added to metered usage for this request (0 when billed from prepaid).
​
tokensSpent
number
deprecated
Number of tokens used for the content generation or rephrasing
​
totalTokensSpent
number
deprecated
Total number of tokens consumed by this request
​
systemTokensSpent
number
deprecated
Number of tokens used by the system for processing the request

​
Example Request

curl --location 'https://stealthgpt.ai/api/stealthify' \
    --header 'api-token: YOUR_API_TOKEN' \
    --header 'Content-Type: application/json' \
    --data '{
        "prompt": "Explain the benefits of renewable energy",
        "rephrase": false,
        "tone": "College",
        "mode": "Medium",
        "qualityMode": "quality",
        "model": "heavy",
        "isMultilingual": true,
        "outputFormat": "markdown"
    }'

​
Example Response

{
  "result": "Renewable energy offers several significant advantages in our modern world. Students and researchers point to multiple benefits like reduced carbon emissions, which helps fight climate change. These energy sources, including solar and wind power, represent inexhaustible resources unlike finite fossil fuels. Many communities find economic advantages through job creation in the growing renewable sector. Additionally, these technologies typically require less maintenance after installation and reduce dependency on foreign energy imports. Advancements continue making these options more cost-competitive, with prices dropping significantly over recent years. While challenges exist in implementation, the long-term benefits to environmental health, economic stability, and energy independence make renewable energy sources increasingly attractive options for our global energy needs.",
  "howLikelyToBeDetected": 92,
  "wordsSpent": 260,
  "remainingCredits": 985000,
  "billingMode": "prepaid",
  "meteredChargedCredits": 0,
  "systemTokensSpent": 0,
  "tokensSpent": 0,
  "totalTokensSpent": 0
}

​
Usage Notes

  • For optimal performance, we recommend keeping responses under 2,000 characters
  • The quality and relevance of generated content depends on the phrasing of your prompts
  • For more advanced usage techniques, see our Advanced Usage Guide