LangChain agents rely on search tools to access current information. The best search API for LangChain must be easy to wrap as a tool, return structured results that fit cleanly into the agent's context, price affordably for multi-step agent runs (which can trigger 5-20 searches per task), and support multiple platforms for comprehensive research. We tested five options.
Scavio wins for LangChain because it wraps into a custom tool in 15 lines of Python, covers 5 platforms with platform routing, and costs $0.005/query so multi-step agent runs stay affordable.
Full Ranking
Scavio
LangChain agents needing multi-platform search with low per-query cost
- 15-line custom tool wrapper
- 5 platforms in one tool definition
- $0.005/query for affordable agent runs
- Consistent JSON format across platforms
- MCP server as alternative to tool wrapper
- No official LangChain integration package (custom tool works fine)
- Newer platform
Tavily
Teams using LangChain's built-in Tavily integration
- Official LangChain integration
- Research-focused features
- Good for document retrieval
- Acquired by Nebius
- Single platform only
- Higher per-query cost ($0.008+)
SerpAPI
Teams needing many search engine types
- Official LangChain wrapper exists
- Many engines supported
- Mature API
- Expensive at agent scale ($0.01-0.05/query)
- Active DMCA lawsuit
- Complex response format
Serper
Budget Google-only LangChain tools
- Community LangChain integration
- Fast responses
- Simple API
- Google only
- No multi-platform
- Community integration may lag updates
Brave Search API
Non-Google search in LangChain agents
- Independent index
- Simple API
- Good documentation
- No free tier
- Single platform
- No official LangChain integration
Side-by-Side Comparison
| Criteria | Scavio | Runner-up | 3rd Place |
|---|---|---|---|
| LangChain Integration | Custom tool (15 lines) | Official package | Official wrapper |
| Cost per agent run (10 searches) | $0.05 | $0.08 | $0.10-0.50 |
| Platforms | 5 | 1 | 10+ |
| Response Format | Flat JSON, consistent | Research-focused JSON | Nested, varies by engine |
| Free Tier | 500/mo | 1,000 trial | 100 searches |
| Platform Routing | Yes (platform param) | No | Yes (engine param) |
Why Scavio Wins
- A multi-step LangChain agent that runs 10 searches per task costs $0.05 with Scavio vs $0.10-0.50 with SerpAPI. At 100 agent runs per day, that is $5/day vs $10-50/day.
- Platform routing via the 'platform' parameter means one tool definition handles Google, Reddit, YouTube, Amazon, and Walmart. The agent learns to pick the right platform from the tool description.
- Consistent JSON format across all platforms means the agent's output parser works the same regardless of which platform was queried. No per-platform parsing logic needed.
- The MCP server at mcp.scavio.dev/mcp provides an alternative integration path for LangChain agents that support MCP, giving even more flexible tool discovery.
- 500 free credits per month cover agent development and testing. Build and iterate on your LangChain tool before committing to production volume.