Machine learning APIs provide pre-trained models and ML infrastructure for predictions, classifications, and data analysis. Add intelligent features to your apps without deep ML expertise.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| AI Economics Tools | Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek | none | Yes | yes | 100% (5 checks) |
| AI For Thai | Free Various Thai AI API | apikey | Yes | yes | 100% (5 checks) |
| AI Stupid Level | Benchmark scores, rankings and drift data for major LLM APIs, re-measured on a fixed schedule | apikey | Yes | yes | 100% (5 checks) |
| AnswerLine | ChatGPT, Gemini, Copilot, AI Mode and Google Search/News results as structured JSON | apikey | Yes | unknown | 100% (5 checks) |
| BRAINIALL | PT-BR and Spanish audio transcription with diarization and SRT/VTT | apikey | Yes | yes | 60.0% (5 checks) |
| Cloudmersive | Image captioning, face recognition, NSFW classification | apikey | Yes | yes | 100% (5 checks) |
| Cohere | NLP API for text generation, embeddings, classification and summarization with a free trial tier | apikey | Yes | yes | 100% (5 checks) |
| ContextFetch | Web search for AI agents, each result as Markdown pruned to the passages relevant to the query | none | Yes | no | 0% (4 checks) |
| DeepAI | Provides AI-powered APIs for text generation, image processing, and more | apikey | Yes | yes | 100% (5 checks) |
| Dialogflow | Natural Language Processing | apikey | Yes | unknown | 100% (5 checks) |
| GEN | Create and edit video projects, with credit-based AI media generation | apikey | Yes | yes | 100% (5 checks) |
| GoldBean | OCR, Translation, NLP & ERNIE LLM via Baidu AI (free tier available) | apikey | Yes | unknown | 80.0% (5 checks) |
| Google Gemini | Multimodal generative AI for text, vision, and code generation | apikey | Yes | unknown | 80.0% (5 checks) |
| Groq | Fast AI inference API with free tier, supports Llama, Mixtral, Gemma models | apikey | Yes | yes | 100% (5 checks) |
| Hirak FaceAPI | Face detection, face recognition with age estimation/gender estimation, accurate, no quota limits | apikey | Yes | unknown | 80.0% (5 checks) |
| Hugging Face | AI model hub with inference API for NLP, computer vision, and audio | apikey | Yes | yes | 100% (5 checks) |
| Inferdo | Computer Vision services like Facial detection, Image labeling, NSFW classification | apikey | Yes | unknown | 100% (5 checks) |
| Irisnet | Realtime content moderation API that blocks or blurs unwanted images in real-time | apikey | Yes | yes | 100% (5 checks) |
| Jina AI | Free AI API for embeddings, reranking, and text processing | apikey | Yes | yes | 100% (5 checks) |
| Lacuna | Public board where AI agents post problems as seeks and agents who solved them offer help | none | Yes | unknown | 100% (5 checks) |
| Machinetutors | AI Solutions: Video/Image Classification & Tagging, NSFW, Icon/Image/Audio Search, NLP | apikey | Yes | yes | 80.0% (5 checks) |
| MediaCraft AI | Chinese content compliance review (17 platforms), EN↔CN translation, and SEO optimization. Pay-per-call via x402 (Solana USDC). | apikey | Yes | yes | 100% (5 checks) |
| MessengerX.io | A FREE API for developers to build and monetize personalized ML based chat apps | apikey | Yes | yes | 100% (5 checks) |
| Mistral AI | High-performance LLM API by Mistral AI including Mistral and Mixtral models, with a free tier | apikey | Yes | yes | 100% (5 checks) |
| Modelfax | LLM pricing, context windows and deprecation dates, schema-validated and updated daily | none | Yes | yes | 100% (5 checks) |
| NLP Cloud | NLP API using spaCy and transformers for NER, sentiments, classification, summarization, and more | apikey | Yes | unknown | 100% (5 checks) |
| Nonobench | Open-source benchmark of how well LLMs solve nonogram puzzles | none | Yes | yes | 100% (5 checks) |
| Not Human Search | AI tool discovery with agentic scoring for 8,600+ tools and MCP servers | none | Yes | yes | 100% (5 checks) |
| onomeo | OpenAI-compatible, 47 LLMs, small check-in credits, strict limits, optional paid top-up, public beta | apikey | Yes | no | 100% (5 checks) |
| OpenRouter | Unified API for 300+ LLMs from OpenAI, Anthropic, Meta, Mistral and more, with a free tier | apikey | Yes | yes | 100% (5 checks) |
| Opper | EU-hosted OpenAI-compatible gateway to 700+ models from 50+ providers, with free models | apikey | Yes | yes | 100% (4 checks) |
| Perspective | NLP API to return probability that if text is toxic, obscene, insulting or threatening | apikey | Yes | unknown | 100% (5 checks) |
| Pictograph | Train custom vision models and run them as real-time detection endpoints, with a free tier | apikey | Yes | no | 100% (4 checks) |
| Replicate | Run open-source AI models in the cloud including image generation, LLMs and audio models | apikey | Yes | yes | 100% (5 checks) |
| Requesty | OpenAI compatible LLM router for 600+ models, with a free tier for free models | apikey | Yes | yes | 100% (5 checks) |
| SafeReel | NSFW detection for images and full-length videos by URL, free tier | apikey | Yes | yes | 100% (5 checks) |
| SkyBiometry | Face Detection, Face Recognition and Face Grouping | apikey | Yes | unknown | 100% (5 checks) |
| Speak AI | Transcribe and analyze audio and video in 100+ languages | apikey | Yes | unknown | 100% (5 checks) |
| Statlyte | Live pricing, context windows and model ids for major LLM APIs | none | Yes | yes | 100% (5 checks) |
| Tanvo | Image, video and song generation on 30 AI models (Nano Banana, Kling, Veo, Suno), with a free tier | apikey | Yes | yes | 100% (5 checks) |
| TensorFeed | Real-time AI news, model pricing, service status, and agent activity feeds | none | Yes | yes | 100% (5 checks) |
| Time Door | A time series analysis API | apikey | Yes | yes | 100% (5 checks) |
| Together AI | Fast inference API for open-source LLMs including Llama, Qwen, DeepSeek with a free tier | apikey | Yes | yes | 100% (5 checks) |
| TokenRoute | One OpenAI-compatible endpoint for hundreds of LLMs, with a free tier and per-token pricing | apikey | Yes | yes | 100% (5 checks) |
| Unplugg | Forecasting API for timeseries data | apikey | Yes | unknown | 100% (5 checks) |
| Voxell Forge | OpenAI-compatible text embeddings API, free-forever model with no credit card required | apikey | Yes | no | 100% (5 checks) |
| WolframAlpha | Provides specific answers to questions using data and algorithms | apikey | Yes | unknown | 100% (5 checks) |
8 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
39 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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