AI APIs expose large language models, image generators, speech-to-text, and embedding models over HTTP. Pricing is typically per-token or per-request, with free tiers that are enough for prototyping. Check rate limits and latency carefully — these are the two signals that determine whether an AI API works in production. CORS support varies: some providers allow browser calls, others require a backend proxy.
| API | Pricing | Auth | CORS | Health | |
|---|---|---|---|---|---|
| AI Economics Tools API Token cost, LLM energy, agent-hour and Proof-Adjusted Autonomy calculators by Michał Piszczek | Paid | API Key | Yes | Profile | |
| AI21 Labs API AI21 Labs Jamba family foundation models via Maestro and chat completion APIs for long-context enterprise workloads. | Freemium | API Key | No | Profile | |
| AIception Interactive API Here you can play & test & prototype all the endpoints using just your browser! Go ahead! | Paid | Unknown | Yes | Profile | |
| AWS CloudSearchDomain API Official AWS CloudSearchDomain service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS CloudTrail API Official AWS CloudTrail service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Comprehend API Official AWS Comprehend service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS ComprehendMedical API Official AWS ComprehendMedical service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS ForecastQueryService API Official AWS ForecastQueryService service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS ForecastService API Official AWS ForecastService service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS LexModelBuildingService API Official AWS LexModelBuildingService service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS LexRuntime API Official AWS LexRuntime service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Lightsail API Official AWS Lightsail service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS ManagedBlockchain API Official AWS ManagedBlockchain service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS MediaTailor API Official AWS MediaTailor service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Personalize API Official AWS Personalize service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS PersonalizeEvents API Official AWS PersonalizeEvents service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS PersonalizeRuntime API Official AWS PersonalizeRuntime service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS PinpointEmail API Official AWS PinpointEmail service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Polly API Official AWS Polly service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Rekognition API Official AWS Rekognition service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Route53Domains API Official AWS Route53Domains service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SageMaker API Official AWS SageMaker service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS SageMakerRuntime API Official AWS SageMakerRuntime service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS TranscribeService API Official AWS TranscribeService service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS Translate API Official AWS Translate service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS WorkMail API Official AWS WorkMail service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| AWS WorkMailMessageFlow API Official AWS WorkMailMessageFlow service API exposed through AWS SDKs and service API references. | Paid | API Key | Yes | Profile | |
| Aleph Alpha API Aleph Alpha Luminous multilingual LLM API with explainability features, hosted in the EU for European data-sovereignty requirements. | Paid | API Key | No | Profile | |
| Alibaba Qwen Model Studio API Qwen chat, image and video models via Alibaba Cloud Model Studio. | Unknown | Unknown | Yes | Profile | |
| Amazon Bedrock API AWS API for model inference, agents, evaluation, fine-tuning, and managed generative AI workloads through Amazon Bedrock. | Paid | API Key | No | Profile | |
| Anthropic API Anthropic API: Claude AI models for text generation, analysis, coding, and conversation with safety-focused design. | Freemium | API Key | Yes | Profile | |
| Anthropic Claude API Build assistants and agents with Claude models, tool use, vision, files, batches, and streaming. | Paid | API Key | No | Profile | |
| AssemblyAI API AssemblyAI speech-to-text and audio intelligence API: transcription, speaker diarization, summarization, sentiment, and LeMUR LLM framework over audio. | Freemium | API Key | No | Profile | |
| Azure AI.Agents Azure.AI.Agents API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/Azure.AI.Agents/stable/2025-05-01/azure-ai-agents.json. | Paid | API Key | Yes | Profile | |
| Azure AI.Agents Azure.AI.Agents API v1 Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/Azure.AI.Agents/stable/v1/azure-ai-agents.json. | Paid | API Key | Yes | Profile | |
| Azure AI.Projects Azure.AI.Projects API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/Azure.AI.Projects/stable/2025-05-01/azure-ai-projects.json. | Paid | API Key | Yes | Profile | |
| Azure AI.Projects Azure.AI.Projects API v1 Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/Azure.AI.Projects/stable/v1/azure-ai-projects.json. | Paid | Unknown | Yes | Profile | |
| Azure Ai Content Understanding API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/ContentUnderstanding/stable/2025-11-01/ContentUnderstanding.json. | Paid | Unknown | Yes | Profile | |
| Azure Ai Document Intelligence API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/DocumentIntelligence/stable/2024-11-30/DocumentIntelligence.json. | Paid | API Key | Yes | Profile | |
| Azure Ai Face API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/Face/stable/v1.0/Face.json. | Paid | API Key | Yes | Profile | |
| Azure Ai Health Insights API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/HealthInsights/stable/2024-10-01/openapi.json. | Paid | API Key | Yes | Profile | |
| Azure Ai Image Analysis API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/ImageAnalysis/stable/2023-10-01/generated.json. | Paid | API Key | Yes | Profile | |
| Azure Ai Voice Live API Official Microsoft Azure REST API OpenAPI specification for specification/ai/data-plane/VoiceLive/stable/2026-07-15/VoiceLive.json. | Paid | API Key | Yes | Profile | |
| Azure OpenAI Service API Microsoft Azure-hosted OpenAI-compatible model inference API for chat, embeddings, image, and audio workloads. | Paid | API Key | No | Profile | |
| BRAINIALL API PT-BR and Spanish audio transcription with diarization and SRT/VTT | Unknown | API Key | Yes | Profile | |
| Baidu Qianfan API ERNIE and open models on Baidu's Qianfan MaaS platform. | Unknown | Unknown | Yes | Profile | |
| Baseten API Baseten platform API for deploying and calling open-source and custom models with autoscaling GPUs, TensorRT-LLM optimization, and model APIs. | Paid | API Key | No | Profile | |
| Black Forest Labs FLUX API Black Forest Labs FLUX API for frontier image-generation models (FLUX.1 family) with async task queueing and commercial licensing tiers. | Paid | API Key | No | Profile | |
| Brainshop.ai AI chatbot API for creating conversational bots with natural language understanding and customizable responses. | Freemium | API Key | Unknown | Profile | |
| Braintrust API Braintrust API for AI evaluation, logging, and prompt playground workflows, enabling teams to ship reliable LLM features iteratively. | Freemium | API Key | No | Profile | |
| Cartesia Sonic API Cartesia Sonic low-latency voice synthesis and voice-changing API with WebSocket streaming designed for real-time conversational agents. | Freemium | API Key | No | Profile | |
| Cerebras Inference API Run open language and vision models with high-speed OpenAI-compatible inference and streaming. | Freemium | API Key | No | Profile | |
| Clipdrop API Clipdrop API suite from stability ecosystem: background removal, cleanup, relighting, upscaling, and text/image tools as simple HTTP endpoints. | Freemium | API Key | No | Profile | |
| Cloudflare Workers AI Run serverless open AI models on Cloudflare's global network from Workers or the REST API. | Freemium | API Key | No | Profile | |
| CodexHot GPT API Paid OpenAI-compatible Responses API for GPT model access, with API-key authentication. | Paid | API Key | Unknown | Profile | |
| Cohere API Cohere API: text generation, embeddings, classification, reranking, and multilingual NLP models. | Freemium | API Key | Yes | Profile | |
| Copyleaks API Copyleaks AI-content and plagiarism detection API with multi-language support, source-matching reports, and enterprise compliance controls. | Paid | API Key | No | Profile | |
| Customer Credit API With Customer Credit your store can enable **credit payments** through the checkout. You can also control **invoices** and the **credit limits** of your clients. Learn more about Customer Credit in our [Help Center artic | Unknown | API Key | Yes | Profile | |
| DeepAI API Provides AI-powered APIs for text generation, image processing, and more | Free | API Key | Yes | Profile | |
| DeepInfra API Run open models for chat, vision, embeddings, images, video, and speech through an OpenAI-compatible API. | Paid | API Key | No | Profile | |
| DeepSeek API DeepSeek API for DeepSeek-V3 chat/reasoning and DeepSeek-R1 reasoning models with OpenAI-compatible endpoints and transparent token pricing. | Paid | API Key | No | Profile | |
| Deepcode API AI for code review | Free | OAuth | Unknown | Profile | |
| Deepgram API Deepgram speech-to-text, text-to-speech, and voice-agent APIs with streaming transcription over HTTP and WebSocket. Includes free credits to start. | Freemium | API Key | No | Profile | |
| DreamThreads API Parse dreams into structured entities, emotions, agency, threat, and outcomes | Free | API Key | Yes | Profile | |
| ElevenLabs API Generate speech, transcribe audio, create voices, dub media, and build realtime conversational voice agents. | Freemium | API Key | No | Profile | |
| ElevenLabs API Documentation API This is the documentation for the ElevenLabs API. You can use this API to use our service programmatically, this is done by using your xi-api-key. <br/> You can view your xi-api-key using the 'Profile' tab on https://bet | Free | Unknown | Yes | Profile | |
| Fal API Fast generative media and model inference API. | Freemium | API Key | Yes | Profile | |
| Featherless AI API Featherless AI subscription inference service giving access to thousands of open-weight models through one OpenAI-compatible endpoint. | Paid | API Key | No | Profile | |
| Fireworks AI API Run language, image, and embedding models and manage fine-tuning, datasets, and deployments. | Paid | API Key | No | Profile | |
| GPTZero API GPTZero API for AI-content detection with sentence-level classification, plus plagiarism checking for education and publishing workflows. | Freemium | API Key | No | Profile | |
| GoldBean API OCR, Translation, NLP & ERNIE LLM via Baidu AI (free tier available) | Free | API Key | Unknown | Profile | |
| Google AI Commerce Search API Official Google AI Commerce Search API REST API (v2alpha) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google AI Platform Training & Prediction API Official Google AI Platform Training & Prediction API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Agent Platform API Official Google Agent Platform API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Air Quality API Official Google Air Quality API REST API (v1) discovered via Google APIs Discovery Service. | Paid | API Key | Yes | Profile | |
| Google Android Device Provisioning Partner API Official Google Android Device Provisioning Partner API REST API (v1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Blockchain Node Engine API Official Google Blockchain Node Engine API REST API (v1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Campaign Manager 360 API Official Google Campaign Manager 360 API REST API (v3.5) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Cloud Dataplex API Official Google Cloud Dataplex API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Cloud Document AI API Official Google Cloud Document AI API REST API (v1beta3) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Cloud Domains API Official Google Cloud Domains API REST API (v1alpha2) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Cloud Natural Language API Official Google Cloud Natural Language API REST API (v1beta2) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Cloud Speech-to-Text API Official Google Cloud Speech-to-Text API REST API (v1p1beta1) discovered via Google APIs Discovery Service. | Free | API Key | Yes | Profile | |
| Google Cloud Text-to-Speech API Official Google Cloud Text-to-Speech API REST API (v1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Cloud Translation API Official Google Cloud Translation API REST API (v3beta1) discovered via Google APIs Discovery Service. | Free | API Key | Yes | Profile | |
| Google Cloud Vision API Official Google Cloud Vision API REST API (v1p1beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Contact Center AI Insights API Official Google Contact Center AI Insights API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | Unknown | Yes | Profile | |
| Google Contact Center AI Platform API Official Google Contact Center AI Platform API REST API (v1alpha1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Container Analysis API Official Google Container Analysis API REST API (v1alpha1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Dialogflow API Official Google Dialogflow API REST API (v2beta1) discovered via Google APIs Discovery Service. | Paid | Unknown | Yes | Profile | |
| Google Discovery Engine API Official Google Discovery Engine API REST API (v1alpha) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Document AI Warehouse API Official Google Document AI Warehouse API REST API (v1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Gemini API Build multimodal AI applications with Gemini models for text, images, audio, video, tools, and structured output. | Freemium | API Key | Yes | Profile | |
| Google Gemini Enterprise for Customer Experience API Official Google Gemini Enterprise for Customer Experience API REST API (v1beta) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google Gmail API Official Google Gmail API REST API (v1) discovered via Google APIs Discovery Service. | Unknown | API Key | Yes | Profile | |
| Google Gmail Postmaster Tools API Official Google Gmail Postmaster Tools API REST API (v1beta1) discovered via Google APIs Discovery Service. | Unknown | API Key | Yes | Profile | |
| Google Kubernetes Engine API Official Google Kubernetes Engine API REST API (v1beta1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile | |
| Google On-Demand Scanning API Official Google On-Demand Scanning API REST API (v1beta1) discovered via Google APIs Discovery Service. | Free | OAuth | Yes | Profile | |
| Google Places Aggregate API Official Google Places Aggregate API REST API (v1) discovered via Google APIs Discovery Service. | Paid | API Key | Yes | Profile | |
| Google Recommendations AI (Beta) Official Google Recommendations AI (Beta) REST API (v1beta1) discovered via Google APIs Discovery Service. | Free | Unknown | Yes | Profile |
For AI APIs, prioritize latency and rate limits over raw model quality — a slightly weaker model with 10x the throughput often ships better products. Check whether the provider supports streaming, function calling, and your required context window before prototyping.