LangChain Web Search: Best API Options

Compare web search APIs for LangChain.

10 min readLuca Moretti

LangChain Search Options

Tool Price/1K Quality
Keiro $0.30 Excellent
Tavily $8.00 Good
Exa $6.13 Good

Using Keiro

from langchain_keiro import KeiroSearchTool

search = KeiroSearchTool(api_key="your_key")
result = search.run("AI news")

Keiro is 26x cheaper than Tavily.

Get Keiro

Luca Moretti
Luca Moretti
Senior Engineer · 34 articles

Senior engineer on the Keiro core team. Writes about search infrastructure, latency optimization, and cost-efficient API design. Worked with Cloudflare Workers and Go at scale.

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Updated March 23, 2026

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