Machine Learning – Free-tier APIs
49 Free-tier APIs in the category Machine Learning. Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
AI Economics Tools
Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek
AI For Thai
Free Various Thai AI API
AnswerLine
ChatGPT, Gemini, Copilot, AI Mode and Google Search/News results as structured JSON
Audexum
Speech-to-text in 25 languages and text-to-speech with 43 voices in 32 languages
BRAINIALL
PT-BR and Spanish audio transcription with diarization and SRT/VTT
Cloudmersive
Image captioning, face recognition, NSFW classification
Cohere
NLP API for text generation, embeddings, classification and summarization with a free trial tier
DeepAI
Provides AI-powered APIs for text generation, image processing, and more
Deepcode
AI for code review
Dialogflow
Natural Language Processing
GEN
Create and edit video projects, with credit-based AI media generation
Google Gemini
Multimodal generative AI for text, vision, and code generation
Groq
Fast AI inference API with free tier, supports Llama, Mixtral, Gemma models
Hirak FaceAPI
Face detection, face recognition with age estimation/gender estimation, accurate, no quota limits
Hugging Face
AI model hub with inference API for NLP, computer vision, and audio
Imagga
Image Recognition Solutions like Tagging, Visual Search, NSFW moderation
Inferdo
Computer Vision services like Facial detection, Image labeling, NSFW classification
Irisnet
Realtime content moderation API that blocks or blurs unwanted images in real-time
Jina AI
Free AI API for embeddings, reranking, and text processing
Keen IO
Data Analytics
Lacuna
Public board where AI agents post problems as seeks and agents who solved them offer help
Laya Decision Gateway
Sub-35ms AI gateway for prompt injection defense, support ticket triage & content moderation
Machinetutors
AI Solutions: Video/Image Classification & Tagging, NSFW, Icon/Image/Audio Search, NLP
MediaCraft AI
Chinese content compliance review (17 platforms), EN↔CN translation, and SEO optimization. Pay-per-call via x402 (Solana USDC).
MessengerX.io
A FREE API for developers to build and monetize personalized ML based chat apps
Mistral AI
High-performance LLM API by Mistral AI including Mistral and Mixtral models, with a free tier
Modelfax
LLM pricing, context windows and deprecation dates, schema-validated and updated daily
NLP Cloud
NLP API using spaCy and transformers for NER, sentiments, classification, summarization, and more
Nonobench
Open-source benchmark of how well LLMs solve nonogram puzzles
Not Human Search
AI tool discovery with agentic scoring for 8,600+ tools and MCP servers
onomeo
OpenAI-compatible, about 30 free LLMs, 30 calls per 5 hours, optional pay-as-you-go, public beta
OpenRouter
Unified API for 300+ LLMs from OpenAI, Anthropic, Meta, Mistral and more, with a free tier
Perspective
NLP API to return probability that if text is toxic, obscene, insulting or threatening
QuelLLM
Open-weight language model catalogue with memory requirements and installation metadata
Replicate
Run open-source AI models in the cloud including image generation, LLMs and audio models
Requesty
OpenAI compatible LLM router for 600+ models, with a free tier for free models
Roboflow Universe
Pre-trained computer vision models
SafeReel
NSFW detection for images and full-length videos by URL, free tier
SkyBiometry
Face Detection, Face Recognition and Face Grouping
Speak AI
Transcribe and analyze audio and video in 100+ languages
Statlyte
Live pricing, context windows and model ids for major LLM APIs
Tanvo
Image, video and song generation on 30 AI models (Nano Banana, Kling, Veo, Suno), with a free tier
TensorFeed
Real-time AI news, model pricing, service status, and agent activity feeds
Time Door
A time series analysis API
Together AI
Fast inference API for open-source LLMs including Llama, Qwen, DeepSeek with a free tier
TokenRoute
One OpenAI-compatible endpoint for hundreds of LLMs, with a free tier and per-token pricing
Unplugg
Forecasting API for timeseries data
Voxell Forge
OpenAI-compatible text embeddings API, free-forever model with no credit card required
WolframAlpha
Provides specific answers to questions using data and algorithms