Stability AI: 25 free credits on new account (image/audio APIs)
Source: https://platform.stability.ai/pricing
Description
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+ 1 Stability AI's developer platform (platform.stability.ai) grants every new account 25 free credits to test SD3.5, Stable Image Ultra/Core, Stable Audio 2.5, and the rest of the REST API lineup. At 1 credit = $0.01, that is $0.25 of credit — enough for ~3 images on the flagship Ultra model (8 credits each), ~8 images on Core (3 credits each), or one Stable Audio 2.5 generation (20 credits). No credit card is required to claim the 25 credits, and no auto-billing kicks in once they run out.
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+ 7 1. Go to platform.stability.ai.
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+ 8 2. Click Login → Sign up. You can use email + password, Google, or GitHub.
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+ 9 3. Verify your email if you signed up with email/password.
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+ 10 4. Once you land on the dashboard, the 25 free credits are already on your account — nothing to claim.
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+ 11 5. Open the Account / API Keys tab (top-right profile menu). An API key is auto-created on signup; click the 👁 icon to reveal it or use + to create up to 10 keys.
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+ 12 6. Test the key against any REST endpoint, e.g. Stable Image Core:
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+ 14 curl -X POST https://api.stability.ai/v2beta/stable-image/generate/core \
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-H "Authorization: Bearer sk-..." \
-H "Authorization: Bearer sk-..." \ No comments on this line yet.
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-H "Accept: image/*" \
-H "Accept: image/*" \ No comments on this line yet.
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-F prompt="a cat astronaut" \
-F prompt="a cat astronaut" \ No comments on this line yet.
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-F output_format="png" \
-F output_format="png" \ No comments on this line yet.
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-o cat.png
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+ 21 7. To buy more credits, go to Billing and add a card. There is no recurring subscription by default — you top up credits when you want.
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+ 22
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+ 23 Important:
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+ 24 • No credit card required to use the initial 25 credits.
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+ 25 • No auto-charge when credits hit zero — calls just return a 402-style error until you top up.
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+ 26 • Account is personal; the 25-credit grant is one-shot per account (not per month).
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+ 27 • If a generation fails for content-policy reasons, credits are still deducted — budget accordingly when prototyping NSFW-adjacent prompts.
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+ 28 • Stability AI runs an NSFW filter server-side; outputs flagged as adult content return a black image (and still consume credits).
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+ 34 All endpoints are documented at platform.stability.ai/docs/api-reference. Pricing is in credits (1 credit = $0.01).
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+ 38 EndpointModelCredits / callUSD / call
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/v2beta/stable-image/generate/ultraStable Image Ultra (built on SD 3.5 Large)8$0.08
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/v2beta/stable-image/generate/coreStable Image Core3$0.03
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/v2beta/stable-image/generate/sd3Stable Diffusion 3.5 Large6.5$0.065
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/v2beta/stable-image/generate/sd3SD 3.5 Large Turbo4$0.04
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/v2beta/stable-image/generate/sd3SD 3.5 Medium3.5$0.035
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/v1/generation/.../text-to-imageSDXL 1.00.2–0.6$0.002–$0.006
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+ 45
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+ 47 • Erase — 3 credits
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+ 48 • Inpaint — 3 credits
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+ 49 • Outpaint — 4 credits
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+ 50 • Search-and-Replace — 4 credits
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+ 51 • Search-and-Recolor — 5 credits
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+ 52 • Remove Background — 2 credits
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+ 53 • Replace Background and Relight — 8 credits
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+ 56 • Sketch — 3 credits
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+ 57 • Structure — 3 credits
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+ 58 • Style — 4 credits
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+ 59 • Style Transfer — 8 credits
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+ 60
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+ 62 • Conservative Upscale — 25 credits
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+ 63 • Creative Upscale — 25 credits
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+ 64 • Fast Upscale — 1 credit
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+ 65
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+ 67 • Image-to-Video (Stable Video Diffusion) — 20 credits per generation
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+ 68
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+ 70 • Stable Audio 2.5 (text-to-audio, up to ~190 s long-form) — 20 credits ($0.20) per generation
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+ 71 • Audio-to-Audio — 20 credits per generation
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+ 72
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+ 74 • Stable Fast 3D — 4 credits per generation
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+ 75 • Stable Point Aware 3D — 4 credits per generation
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+ 76
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+ 77 With the 25 free credits you can do roughly: 3 Ultra images, or 8 Core images, or 1 Stable Audio clip, or 1 video with 5 credits left over, etc.
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+ 78
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+ 79 Source for current model list & pricing: platform.stability.ai/pricing and API Price Update post.
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+ 85 When the 25 credits are gone, you can top up directly from the Billing page:
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+ 86
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+ 87 Top-upCreditsEffective rate
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+ 88 $101,000 credits$0.01 / credit
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+ 89 $505,000 credits$0.01 / credit
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+ 90 $20 / month subscription6,000 credits~$0.0033 / credit
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+ 91
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+ 92 The $20/month membership is the cheapest way to get bulk credits but it is a recurring charge — cancel from Billing if you only want the one month.
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+ 98 Outputs from the API are usable commercially under Stability's Community License if your organization’s annual revenue is below $1,000,000 USD. Above $1M revenue you need an Enterprise License — contact Stability sales.
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+ 99
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+ 100 See stability.ai/license and Community License update for the binding terms.
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+ 101
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+ 103
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+ 105
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+ 106 • Default rate limit: 150 requests per 10 seconds per API key (per Stability docs); contact support for higher.
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+ 107 • Failed safety-filter generations still cost credits. Plan prompts accordingly.
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+ 108 • Black-image returns indicate a content-policy block, not an API bug.
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+ 109 • No region restrictions on signup that are documented — works globally.
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+ 110 • API key rotation: up to 10 keys per account; rotate by deleting old ones in the dashboard.
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+ 111 • DreamStudio (dreamstudio.ai) is a separate consumer UI with its own credit pool — do not confuse it with the developer platform.
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+ 112 • Stable Audio (stableaudio.com) is also a separate consumer product with its own free monthly minutes; only Stable Audio 2.5 via the API uses platform credits.
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+ 113
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+ 118 • If 25 credits is not enough to evaluate, also consider Pollinations, Together AI, Replicate ($1 free), or Fal.ai for free/cheap SD-family inference.
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+ 119 • For long-running production workloads, the $20/month membership (6,000 credits) is more economical than pay-as-you-go.
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+ 120 • Self-hosting SD 3.5 weights from HuggingFace is free under the Community License if you have your own GPU and stay under the $1M revenue threshold.
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+ 121 • The getting-started docs include Python and Node SDK examples.
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+ 122
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+ 124
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+ 125 Sources:
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+ 126 • Stability AI Developer Platform Pricing
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+ 127 • Stability AI API Price Update (per-model credit costs)
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+ 128 • Stability AI Getting Started Docs
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+ 129 • Where can I find my API Key? — Stability KB
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+ 130 • Stability AI Community License
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+ 131 • Stability AI Community License Update
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+ 132 • Stable Audio 2.5 product page
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