APIs Tools
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Mistral AI API
Freemium
Mistral AI's API provides access to Mistral Large, Small, and Codestral models for text generation, code completion, and embedding tasks. Mistral models offer excellent performance-per-cost ratios and are available under permissive open-weight licences for self-hosting. The La Plateforme API supports function calling, JSON mode, and streaming. Mistral's European base and GDPR compliance make it popular with European enterprises requiring data sovereignty alongside state-of-the-art AI capabilities.
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Stability AI API
Freemium
Stability AI's API provides access to Stable Diffusion, Stable Video Diffusion, and Stable Audio models for image generation, video generation, image editing, and audio synthesis. The REST API supports text-to-image, image-to-image, inpainting, outpainting, and upscaling workflows. Developers use it to integrate generative media capabilities into creative tools, design platforms, and content pipelines. Offers both hosted API access and open-weight models for self-hosting on own infrastructure.
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Replicate API
Freemium
Replicate's API makes it easy to run thousands of open-source AI models with a single REST endpoint. Access Stable Diffusion, Llama, Whisper, CodeLlama, and community models without managing GPU infrastructure. Pay per second of compute used with no minimum commitments. Webhooks notify your application when async predictions complete. Developers use Replicate to rapidly prototype AI features and integrate diverse model capabilities into products without the overhead of building and maintaining model serving pipelines.
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ElevenLabs API
Freemium
ElevenLabs API provides access to the most realistic AI text-to-speech and voice cloning technology available. Generate human-quality speech in 29 languages, clone voices from audio samples, and create custom AI voices for products. The API supports streaming audio for low-latency applications, voice design for creating synthetic voices, and dubbing for video content. Used by audiobook platforms, game studios, podcast tools, and accessibility applications requiring natural-sounding AI speech at scale.
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Deepgram API
Freemium
Deepgram provides a speech AI platform with APIs for speech-to-text transcription, text-to-speech synthesis, and audio intelligence. Its Nova-2 model delivers best-in-class transcription accuracy with sub-300ms latency for real-time streaming applications. Deepgram supports 100+ languages, speaker diarisation, custom vocabulary, and domain-specific models for medical and legal transcription. Used by Twilio, Spotify, and Natera for voice-enabled products requiring fast, accurate speech recognition at scale.
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AssemblyAI API
Freemium
AssemblyAI is a speech AI platform providing transcription, speaker detection, sentiment analysis, topic detection, PII redaction, and auto chapters from audio and video files via API. Its LeMUR feature uses LLMs to answer questions, summarise, and generate action items from transcripts. AssemblyAI handles async and real-time streaming transcription with high accuracy across accents and audio conditions. Used by meeting tools, podcast platforms, and call analytics companies for production audio intelligence.
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Together AI API
Freemium
Together AI's inference API provides access to 100+ open-source models including Llama 3, Mistral, Qwen, and DBRX with speeds up to 400 tokens per second and competitive pricing. It supports chat completions, embeddings, and image generation with an OpenAI-compatible API format for easy migration. Together's fine-tuning API enables custom model training on proprietary datasets with LoRA and full fine-tuning options. Popular as a cost-effective alternative to proprietary APIs for open-source model inference.
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Tavily API
Freemium
Tavily is a search API purpose-built for AI agents and RAG applications that returns clean, relevant web content optimised for LLM consumption. Unlike standard search APIs that return raw HTML and links, Tavily returns structured, clean text excerpts from the most relevant sources for any query. It handles search result filtering, content extraction, and relevance ranking automatically. Used extensively as the default search tool in LangChain, LlamaIndex, and CrewAI agent frameworks for giving agents real-time web access.
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Serper API
Freemium
Serper is a fast, affordable Google Search API that provides real-time search results including organic results, knowledge graph, images, news, and places data via a simple REST interface. At a fraction of the cost of official Google APIs, Serper is widely used by AI developers to give LLM agents access to current web information. Supports 50+ countries and languages. Popular in LangChain, AutoGPT, and custom AI agent stacks as a reliable, low-latency source of real-time web search data.
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fal.ai
Freemium
fal.ai is a high-performance inference API platform for generative AI models specialising in image and video generation with extremely fast inference times. It runs FLUX, Stable Diffusion, video generation, and other media models on optimised GPU infrastructure delivering results in 1-3 seconds. The queue-based API handles bursts of requests without rate limiting. Used by creative applications, design tools, and developers who need reliable, fast image generation API access without managing model infrastructure.
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Cerebras API
Freemium
Cerebras API provides access to Llama models running on Cerebras Wafer Scale Engine hardware, delivering inference speeds of 2000+ tokens per second — the fastest LLM inference commercially available. The API is OpenAI-compatible for easy integration and offers extremely low latency suitable for real-time applications including voice AI, interactive coding, and agentic workflows requiring rapid model responses. Free tier available with no daily token limits, making it popular for developers needing fast open-source model inference.
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APIdog
Freemium
APIdog is a comprehensive API development platform that combines API design, debugging, testing, and documentation into a single unified tool. It supports REST, GraphQL, WebSocket, and gRPC protocols, making it a versatile choice for modern API workflows. Teams can collaborate in real time, auto-generate mock servers, and export to OpenAPI or Postman formats with zero friction.
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