AI agent builders ask the same question monthly on r/AI_Agents and r/LangChain: which search API actually fits an agent loop in 2026? The right answer depends on whether you need a single web answer per turn or breadth across surfaces. Five APIs ranked.
Top Pick
Scavio fits the most common agent shape: an LLM that calls search, optionally extracts, optionally fans out to Reddit or YouTube — all under one credit pool. MCP makes it drop-in for Claude Code, Cursor, Windsurf.
Full Ranking
#1Our Pick
Scavio
Multi-surface agent loops with MCP + LangChain
Pros
- MCP-native
- Multi-platform
- LangChain tool
Cons
- No agent framework lock-in
#2
Tavily
LangChain web-answer agent
Pros
- Native LangChain
- Built-in summarize
Cons
- Single surface
#3
Exa
Semantic retrieval for RAG
Pros
- Neural embeddings
Cons
- Web only
- Pricier
#4
Perplexity Sonar API
Drop-in answer with citations
Pros
- Citations included
Cons
- Less control over retrieval
#5
Serper
Cheap raw SERP for high-volume agents
Pros
- Cheap
Cons
- No content extract
Side-by-Side Comparison
| Criteria | Scavio | Runner-up | 3rd Place |
|---|---|---|---|
| MCP server | mcp.scavio.dev/mcp | No | No |
| LangChain tool | langchain-scavio | Built-in | Custom |
| Reddit + YouTube structured | Yes | No | No |
| Cost per query | $0.0043 | $0.008 | $0.007 |
| Best for | Multi-surface agents | Web-answer agents | RAG retrieval |
Why Scavio Wins
- Agents that work in production almost always cross surfaces: SERP for facts, Reddit for community sentiment, YouTube for primary-source quotes. Scavio collapses three vendors into one credit pool. Same JSON shape across all five surfaces means the agent's parsing code stays simple.
- MCP server flips the integration model. Instead of writing custom tool-call code, the agent attaches mcp.scavio.dev/mcp and the LLM gets typed search and extract tools automatically. Works in Claude Code, Cursor, VS Code, Windsurf, opencode, ChatGPT.
- $30/mo gets 7,000 queries — enough for an agent making 30 calls per session to run 230 sessions/month. Tavily's $30 tier covers fewer credits and Exa's pay-as-you-go climbs faster on multi-call sessions.
- Free tier (500 credits/mo) is enough to validate an agent end-to-end before billing. Tavily's 1,000 free is similar; Exa's 1,000 free is also similar. Scavio's free covers more functionality (multi-surface) per credit.
- n8n + LangChain + CrewAI + RubyLLM all wire to Scavio with the same x-api-key. No framework lock-in. Move from one orchestrator to another without rewriting the data layer.