Category
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Machine Learning

ML infrastructure APIs for model training, AutoML, feature stores, model serving, experiment tracking, and MLOps pipelines — covering Vertex AI, SageMaker, Hugging Face, and open-source alternatives.

9APIs
Most Popular In
AutoMLModel ServingFeature Stores
Auth Breakdown
API Key78%
No Auth22%
Notable Developers
Google Vertex AIAWS SageMakerHugging FaceWeights & BiasesMLflow
Updated Jun 12, 2026
Curated by FreeAPIHub editors
Topics:AutoMLModel ServingFeature StoresMLOps & Experiment TrackingBatch PredictionModel Monitoring
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Google Cloud Vision AI logo

Google Cloud Vision AI

API · Machine Learning
FreemiumAPI Key

Google Cloud Vision analyses images: labels, text (OCR), faces, landmarks, logos, objects and safe-search. Send an image and get rich annotations as JSON, part of Google Cloud's AI services.

10K+ usersNot rated yetView
SpeechBrain API logo

SpeechBrain API

API · Machine Learning
FreemiumNo Auth

SpeechBrain is an open-source PyTorch toolkit for speech - recognition, speaker ID and diarization, enhancement and more - with pretrained models you run yourself or via hosted inference.

6500+ usersNot rated yetView
Haystack API logo

Haystack API

API · Machine Learning
Free tierAPI Key

Haystack is deepset's open-source Python framework for building LLM applications - retrieval-augmented generation, semantic search and agents - by wiring components like retrievers, embedders and generators into pipelines.

11K+ usersNot rated yetView
Jina AI Embeddings API logo

Jina AI Embeddings API

API · Machine Learning
FreemiumAPI Key

Jina AI's Embeddings API turns text (and images) into vector embeddings for search, RAG and clustering. Send inputs with a Bearer token and get back high-quality multilingual embeddings as JSON.

15K+ usersNot rated yetView
Nomic Atlas Embeddings API logo

Nomic Atlas Embeddings API

API · Machine Learning
FreemiumAPI Key

The Nomic Atlas Embeddings API turns text and images into vector embeddings using open nomic-embed models, for semantic search, recommendations and retrieval-augmented generation.

1000+ usersNot rated yetView
Replicate ML API logo

Replicate ML API

API · Machine Learning
FreemiumAPI Key

Replicate runs thousands of machine-learning models in the cloud through one API - image, text, audio and video - with no GPU management, billed by the compute each run uses.

4500+ usersNot rated yetView
Ollama API logo

Ollama API

🔥 Hot
Machine Learning

Ollama lets you run open large language models locally and exposes them through a simple REST API. Pull a model like Llama or Mistral and call /api/generate or /api/chat on your own machine - no key, fully private.

Free tierNo Auth
View details
LlamaIndex API logo

LlamaIndex API

🔥 Hot
Machine Learning

LlamaIndex is an open-source data framework for LLM apps. It connects your data to models for retrieval-augmented generation - loading, indexing and querying documents - in Python and TypeScript, with optional LlamaCloud services.

FreemiumAPI Key
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Stability AI API logo

Stability AI API

🔥 Hot
Machine Learning

The Stability AI API gives hosted access to Stable Diffusion models for generating, editing, upscaling and background-removing images from text prompts, returned as image data or JSON.

FreemiumAPI Key
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Showing 9 of 9 resources

At a glance

Compare the top Machine Learning APIs

Browse all APIs
APIAccessAuthFormatsRating
Google Cloud Vision AI logo
Google Cloud Vision AI
FreemiumAPI KeyRESTJSONView
SpeechBrain API logo
SpeechBrain API
FreemiumNo AuthRESTJSONView
Haystack API logo
Haystack API
Free tierAPI KeyRESTJSONView
Jina AI Embeddings API logo
Jina AI Embeddings API
FreemiumAPI KeyRESTJSONView
Nomic Atlas Embeddings API logo
Nomic Atlas Embeddings API
FreemiumAPI KeyRESTJSONView
Replicate ML API logo
Replicate ML API
FreemiumAPI KeyRESTJSONView
Ollama API logo
Ollama API
Free tierNo AuthRESTJSONView
LlamaIndex API logo
LlamaIndex API
FreemiumAPI KeyRESTJSONView

About this category

Machine Learning — developer guide

What Are Machine Learning APIs?

Machine learning APIs abstract the complex, expensive infrastructure required to train, version, deploy, and monitor predictive models. Without managed ML platforms, teams spend more time on infrastructure — provisioning GPU clusters, configuring distributed training, managing model artefacts, and building serving endpoints — than on the actual modelling work. Managed ML APIs handle this undifferentiated heavy lifting so data scientists and ML engineers can focus on data, features, and model quality.

What ML Teams Use These APIs For

  • AutoML training to build custom classifiers and regressors without writing model code
  • Feature store APIs for consistent feature computation and sharing across training and serving
  • Model registry to version, tag, and compare model artefacts from different experiment runs
  • Online prediction endpoints that serve low-latency inference behind a managed REST API
  • Batch prediction jobs that score millions of records on a schedule without provisioning servers
  • Model monitoring to detect data drift, concept drift, and prediction quality degradation in production

Choosing an ML Platform

Google Vertex AI provides the most fully integrated MLOps platform — AutoML, pipelines, Feature Store, Workbench, and Model Garden — on Google's infrastructure. AWS SageMaker dominates in organisations already on AWS, offering the widest range of training instances and managed inference options. Hugging Face is the open-source hub — 2M+ models, the Inference API for hosted serving, AutoTrain for no-code fine-tuning, and Spaces for demo deployment. Weights & Biases is the gold standard for experiment tracking regardless of what platform you train on. For local development, MLflow is the open-source default for tracking and packaging models.