AI agent developers start with free tiers. The question is which free tier lets you build a meaningful agent prototype without hitting walls. We compared every agent-compatible search API free tier available in May 2026, evaluating not just query volume but platform coverage, agent framework support, and the upgrade path when you need more.
For agent development specifically, Scavio's free tier wins on breadth: 250 credits across six platforms with MCP server access means your agent prototype can demonstrate multi-platform search from day one. Tavily's 1K credits win on pure volume for web-only agents.
Full Ranking
Scavio
Agent prototypes needing multi-platform search
- 250 free credits across 6 platforms
- MCP server included in free tier
- No credit card required
- On-demand upgrade at $0.005/credit
- 250 credits limits extensive agent testing
- Less volume than Tavily free tier
Tavily
Web-only agent prototypes needing maximum queries
- 1K free credits, most generous volume
- No card required
- LangChain integration for agents
- Web only, agent can only search the web
- No official MCP server
- AI summaries may not suit all agent architectures
Brave Search API
Simple agent web search prototypes
- $5 free credit covers ~1K searches
- Simple API for quick prototyping
- Independent index
- Original free tier removed Feb 2026
- No MCP server or agent framework adapters
- Web only
Linkup
European agent developers
- EUR 5 free monthly credit
- Standard and deep search options
- REST API for agent integration
- EUR denomination
- No MCP server
- Smaller community for agent use cases
SearXNG
Agent developers who can self-host everything
- Unlimited free queries
- Open source
- Full control over search backend
- Infrastructure costs offset free pricing
- Fragile under volume
- No structured output for agent tools without custom work
Side-by-Side Comparison
| Criteria | Scavio | Runner-up | 3rd Place |
|---|---|---|---|
| Free credits/mo | 250 | 1,000 | ~1,000 ($5 credit) |
| MCP server | Yes (free tier) | Community only | No |
| Platform coverage | 6 platforms | Web only | Web only |
| Card required | No | No | No |
| Agent framework support | MCP + LangChain | LangChain | Custom |
| Upgrade path | $0.005/credit on-demand | $30/mo Researcher | $5/1K requests |
Why Scavio Wins
- The MCP server on the free tier means agent prototypes can demonstrate real MCP tool calling from day one, the single most impressive demo capability for agent projects.
- Six-platform coverage lets agent demos show Google, YouTube, Amazon, Reddit, and TikTok data retrieval, far more compelling than web-only search results.
- The on-demand upgrade path at $0.005 per credit means you can scale past the free tier gradually without committing to a monthly plan.
- For agents that only need web search volume, Tavily's 1K free credits is genuinely the better choice, and we recommend it for that specific use case.
- No card required plus MCP server access creates the fastest path from zero to a working agent search demo.