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StealthGPT API access starts with a monthly API plan. Usage beyond your plan’s words is billed pay-as-you-go.

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Billing Model

  • API plans: Build ($19/month, 100,000 words), Grow ($49/month, 275,000 words) or Scale ($99/month, 600,000 words). Plan words refresh every billing period and unused plan words don’t roll over. When a plan ends, its remaining words are removed.
  • Plan words by model: standard, lite and /api/stealthify/detect use one plan word per charged word. Super uses 2.5 plan words per charged word, so Build’s 100,000 words cover 40,000 Super words.
  • Pay-as-you-go rate: After your plan words and any other prepaid words are used, standard and lite are billed at $0.20 per 1,000 words. Super is billed at $0.05 per 100 words. On /api/stealthify, both rates apply to input words plus output words.
  • Tiered billing thresholds: Your invoice threshold starts lower and can advance automatically as spend increases within a billing period.

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API Billing Tiers

StealthGPT API pay-as-you-go accounts start at Tier 1. Each tier sets an automatic invoice threshold, and your account can move to the next tier after reaching the required spend within the current billing cycle.
  • Tier 1 — Invoice threshold: $50. Spend to advance: $200 (to reach Tier 2).
  • Tier 2 — Invoice threshold: $500. Spend to advance: $1,000 (to reach Tier 3).
  • Tier 3 — Invoice threshold: $1,000. Spend to advance: $2,000 (to reach Tier 4).
  • Tier 4 — Invoice threshold: $2,000. Spend to advance: $4,000 (to reach Tier 5).
  • Tier 5 — Invoice threshold: $10,000. Highest tier (no automatic advancement).
Need custom tier settings, higher invoice thresholds, or tailored billing limits? Email joey@stealthgpt.ai and include your expected billing-cycle usage and required limits.

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Word Consumption Rates

/api/stealthify counts input words plus output words. standard and lite are billed at $0.20 / 1,000 of those words. Super is billed at $0.05 / 100 of those words. /api/stealthify/detect charges input words per request (one billed word per input word). /api/stealthify/agent charges ceil(output words × 10) Stealth API words per successful request, where output words are counted from the primary markdown result. Words are the text split on spaces, with Chinese, Japanese and Thai split into their own words. Text whose words are joined without spaces counts at least one word per 15 letters or digits, and a detect request is at least one word.
For multi-step long-form output (academic essays, SEO posts, platform-tuned social posts), use Stealth Agent. The × 10 multiplier on output words funds the research → draft → optional fact-check → humanize → optional images pipeline.

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Rate Limits

StealthGPT API has the following rate limits to ensure optimal performance and fair usage:
  • 3,500 RPM (Requests Per Minute)
  • 350,000 WPM (Words Per Minute)

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How to Get Started

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Get Started

  1. Choose an API plan at stealthgpt.ai/stealthapi
  2. Subscribe with a payment method; API access and pay-as-you-go billing turn on automatically once the first payment succeeds
  3. Start using the API; pay-as-you-go billing applies after your plan words and any other prepaid words are used