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2026-04-17

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Business Mode Temporarily Disabled

Business mode on /api/stealthify is currently disabled.

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What’s Changed

  • business flag ignored: Requests are processed with the standard engine regardless of whether business is sent as true or false
  • Standard billing applied: All /api/stealthify usage is billed at the standard rate (input words + output words), with no 10x Business multiplier
  • Schema unchanged: The business field is still accepted in request bodies for backward compatibility; no client changes are required
See the Writer & Humanizer endpoint, Advanced Usage, and Pricing pages for details.
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2026-04-09

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Stealth Agent API

Documentation is available for POST /api/stealthify/agent: multi-step Stealth Agent generation (academic, SEO, or social) with the same Stealth API authentication and billing model as /api/stealthify. See Stealth Agent.
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2026-04-07

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Free-to-Start API Billing

StealthGPT API billing has moved to a free-to-start pay-as-you-go model.

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What’s Changed

  • Free activation flow: New users now activate API billing by adding a payment method instead of buying a fixed starter pack
  • Usage-based invoicing: API usage is billed automatically as pay-as-you-go
  • Tiered billing thresholds: Invoicing thresholds now scale by tier based on spend within each billing period
  • Automatic tier advancement: Accounts can move up to higher invoice thresholds automatically as billing-period spend increases; for higher limits or custom arrangements, email joey@stealthgpt.ai

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Impact for Existing Users

  • Users with prepaid words: Existing balances continue to be used first with no interruption
  • Legacy users: If prompted, accept updated billing terms in the dashboard to keep uninterrupted API access
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2026-02-23

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Pay-As-You-Go Billing Enabled

StealthGPT API now supports pay-as-you-go billing after your starter/prepaid words are used.

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What’s New

  • Hybrid Billing Model: Start with free starter access after activation/payment setup (and/or prepaid words), then continue automatically on usage-based billing
  • Standard Usage Rate: $0.20 per 1,000 words for standard requests (business=false)
  • Business Usage Rate: $2.00 per 1,000 words for business requests (business=true)
  • Legacy Account Action Required: Legacy users must accept the new terms in their billing dashboard to continue billing under the updated model

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How It Works

After your prepaid word balance reaches zero, requests continue without interruption and usage is billed automatically based on endpoint mode and word consumption.
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2025-09-09

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New Detector Optimization

You can now optimize your content for specific AI detection tools using the new detector parameter.

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What’s New

  • Detector Parameter: Choose between "turnitin" (default) or "gptzero" to optimize your content for different detection systems
  • Automatic Optimization: The API automatically adjusts generation settings based on your selected detector
  • Enhanced Compatibility: Improved performance across different AI detection platforms

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Getting Started

Simply add the detector parameter to your /api/stealthify requests to get content optimized for your preferred detection tool.
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2025-05-19

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Tokens Deprecated, Words Introduced

The StealthGPT API now uses a word-based system instead of tokens. All references to tokens have been replaced with words throughout the documentation and API responses.

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How Words Are Counted

For the /api/stealthify endpoint, the cost is now calculated as input words + output words. This means you are charged for the total number of words in your prompt plus the words in the generated or rephrased output. For shorter requests, this results in a lower cost; for longer requests, the difference is minimal, making the new system more transparent and fair.

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Deprecated Fields in /api/stealthify

  • tokensSpent (use wordsSpent instead)
  • systemTokensSpent
  • totalTokensSpent

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New Field

  • wordsSpent (number of words used for content generation or rephrasing)