LinkUp
Web search API built for AI grounding — Standard mode for quick lookups, Deep mode for multi-source research.
About
LinkUp is a web search API designed specifically for grounding AI outputs with real-time, factual web data. The key differentiator is a two-tier depth system: Standard search handles quick factual lookups (weather, stock prices, recent events) while Deep search performs thorough multi-source analysis for complex research questions. This lets agents choose speed vs. thoroughness on a per-query basis.
LinkUp achieved state-of-the-art results on OpenAI's SimpleQA benchmark for factuality, making it particularly well-suited for agents that need to minimize hallucinations. The official MCP server supports both search modes and page fetching with optional JavaScript rendering. Built-in LLM connectors for LangChain and LlamaIndex make integration straightforward, and a Prompt Optimizer tool helps agents write better search queries.
The platform offers a free tier with no credit card required. Standard search is priced at €5 per 1,000 queries, while Deep search runs €50 per 1,000 queries. LinkUp claims 5-minute integration time, reflecting their focus on API simplicity.