API Ninjas

Nitro API (Nitro Translate) is a human translation API for AI agents, provided from nitrotranslate.com. It connects AI agents to professional native‑speaker translators in 80+ languages and advertises an account‑free, no‑API‑key agentic payment flow via MPP.

Apify is a marketplace and platform for web-data extraction and AI automation tools called Actors. Actors collect data from sources such as TikTok, Instagram, Google Maps, and websites; their results can be exported, accessed through an API, scheduled, monitored, or integrated with applications, workflows, and AI agents. Apify’s Website Content Crawler cleans HTML, extracts website text in Markdown and other rich formats, downloads files, and supplies content to AI models, LLM applications, vector databases, and retrieval-augmented generation pipelines, with integrations including LangChain and LlamaIndex.

Public APIs is a community-maintained, open-source directory of free public APIs for software projects. The repository organizes APIs by domains such as finance, weather, development, games, and transportation, and records integration details including authentication requirements, HTTPS support, and CORS availability. It also provides contribution guidance and an API for the project.

Anthropic API is the cloud API provided by Anthropic, the AI research company, offering programmatic access to its Claude family of large language models for text generation, chat, and reasoning. The API is intended for developers to integrate Anthropic's models into applications and services.

OpenAI API is a cloud service that provides access to OpenAI's AI models, enabling developers to integrate language processing capabilities into applications. It is used for tasks such as generating text, building chatbots, and orchestrating context and model selection. The API is commonly employed as a backend for various AI-powered tools and services.