Higgsfield API gives developers one async API to call 50+ generative media models for images, video, and more. It has no free tier and is priced per use, starting at $0.0021/image (Kling 2.5 with a 50% discount currently applied), with video models ranging from $0.042/s to $0.318/s.
Comparison table
| Product | Free tier | Starts at | Best for |
|---|---|---|---|
| Higgsfield API (site) | No | $0.0021/mo | Access to 50+ generative media models in one API |
| KaleidoImages (site) | Yes | Not stated | Free access to a fixed library of AI-generated images |
| AI ImgGen (site) | Yes | Not stated | Free, unlimited image generation with one model |
| UnificAlly (site) | Yes | $0.0098/mo | Lowest per-image cost with no subscription |
| ModelHunter AI (site) | Yes | $0.01/mo | Mixed video, image, and audio generation |
| hiapi (site) | Yes | $0.015/mo | Free trial credits before paying |
| Runbase (site) | Yes | $0.02/mo | Trying models without a credit card |
| API for Image, Video and Music Creation (site) | Yes | $8.33/mo | Predictable monthly credit plans |
KaleidoImages
KaleidoImages is a free REST API serving over 17,000 AI-generated images with search, filters, seeds, and metadata. It's not a generation API — you're pulling from an existing image library rather than creating new content on demand. This suits developers who need stock-style AI imagery without paying per call; the creator accepts optional donations but charges nothing. The limitation is clear: no image generation, no video, and no custom prompts, so it can't replace Higgsfield API for on-demand media creation.
AI ImgGen
AI ImgGen is a free AI image generator using the FLUX.1-Dev model, with no login required and unlimited generations. It suits individuals or small projects wanting quick images without setup or per-use billing. A VIP subscription is mentioned for premium features, but pricing details aren't stated. The main limitation is that it's a single model with no stated API documentation, video support, or audio, so it covers a much narrower job than Higgsfield API's 50+ model catalog.
UnificAlly
UnificAlly offers a pay-per-generation API for video, image, LLM, and audio models with no subscriptions or minimums. Pricing starts at $0.0098 per image (Flux.2 Klein), with optional tiered monthly plans available. It suits developers who want the lowest stated entry price and a free tier to start. As a newly launched product (August 2026, one launch-day vote), it has limited track record compared to more established multi-model APIs.
ModelHunter AI
ModelHunter AI provides one API for video, image, and audio generation with pay-as-you-go pricing. Video starts at $0.01/second (Seedance 1.0 Lite at 480p) up to $3.20/request for Veo 3.1; images start at $0.03. It suits teams needing broad model coverage across three media types with a free tier to test first. Launched March 2026 with zero launch-day votes, it's another early-stage entrant, so community feedback and long-term reliability aren't yet established.
hiapi
hiapi is a freemium API for image, video, and audio generation, offering 200 free credits via an API key before pay-as-you-go billing kicks in. Images start at $0.015–$0.107 and video at $0.082 and up, varying by model. It suits developers who want to test multiple models risk-free before committing spend. The tradeoff is a wider, less precise price range than some competitors, making cost estimation for specific models less straightforward upfront.
Runbase
Runbase gives pay-per-use access to top image and video models, with images from $0.02–$0.16 and video from $0.12–$0.66 per second. A free trial is available with no credit card required, which suits developers who want to evaluate output quality before paying. Its per-second video pricing runs higher than several alternatives on this list, so heavy video users may find it costs more than UnificAlly or ModelHunter AI for comparable output.
API for Image, Video and Music Creation
This API from Budget Pixel uses a credit-based model: a free plan with 300 credits/month, and paid plans from $8.33/month (billed annually) for 11,000 credits, plus pay-as-you-go packs from $10. It suits teams that prefer a flat monthly budget over unpredictable per-call charges. The limitation is that at $8.33/month minimum, it's meaningfully more expensive up front than the per-use options above, even though it includes music generation the others don't mention.
How to choose
If you need the absolute lowest cost per call, start with UnificAlly or ModelHunter AI and check their per-model rate cards against your actual usage mix. If you just need static AI images with no generation logic, KaleidoImages or AI ImgGen cost nothing. If you'd rather budget monthly than track per-call spend, the Budget Pixel API's flat credit plans are the only option here that offers that structure.
FAQ
Is any alternative actually cheaper than Higgsfield API's $0.0021 starting price? Not on a strict per-unit basis among the paid options shown, since UnificAlly's $0.0098 and ModelHunter AI's $0.01 are both higher; KaleidoImages and AI ImgGen are free but don't generate new media on demand the same way.
Which alternative has a free tier? All alternatives listed except Higgsfield API itself offer a free tier or free trial, ranging from free credits to fully free access.
Which alternative supports the most media types? UnificAlly and ModelHunter AI both cover video, image, and audio (UnificAlly also lists LLMs), matching Higgsfield API's broad multi-model scope most closely.