Brave Search API
Brave Software, Inc. · Search & web-data APIs
Developer API over Brave's independent web index offering web, news, image, video, LLM-context and grounded-answer endpoints on prepaid credits
ProprietaryFreemiumUsage-basedNov 2, 2026
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Claude Platform
Anthropic · Model providers & APIs
Anthropic's developer platform for the Claude models: Messages API, tool use, structured outputs, prompt caching, batch processing and Managed Agents, plus cloud availability
ProprietaryUsage-basedEnterpriseNov 2, 2026
Exa
Exa Labs · Search & web-data APIs
Search API for AI agents built on Exa's own web index, offering search, page contents, deep research and asynchronous agent endpoints with Python and JavaScript SDKs
ProprietaryFreemiumUsage-basedNov 2, 2026
LangSmith
LangChain, Inc. · Prompting, evaluation & observability
LangChain's hosted platform for tracing, evaluating and deploying LLM applications and agents, with prompt tooling, an LLM gateway and cloud, hybrid or self-hosted options
ProprietaryFreemiumPaidSelf-hostedNov 2, 2026
OpenAI API
OpenAI · Model providers & APIs
OpenAI's hosted developer platform: Responses and Chat Completions APIs, Realtime voice, embeddings, images, audio, fine-tuning, evals and managed agents
ProprietaryUsage-basedEnterpriseNov 2, 2026
Tavily
Tavily (Alpha AI Technologies Inc.) · Search & web-data APIs
Web search, extraction, crawling and research API designed for LLM agents, returning concise source content with SDKs, framework integrations and a hosted MCP server
ProprietaryFreemiumUsage-basedNov 2, 2026
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