Agent developers need search APIs during development and testing without upfront costs. Free tiers vary dramatically: some offer 100 queries/month, others offer 2,500. The best free tier for agent development provides enough queries for testing, supports your agent framework, and covers the platforms your agent needs.
Top Pick
Scavio wins for agent developers with 500 free credits/mo (no card required), hosted MCP for instant agent integration, and five platforms that cover most agent search use cases.
Full Ranking
#1Our Pick
Scavio
Agent devs wanting multi-platform free search with MCP
Pros
- 500 free/mo renewing
- No credit card required
- Hosted MCP (instant setup)
- Five platforms
- LangChain + CrewAI support
Cons
- 500 limit (not the highest)
- Credit-based (shared across platforms)
- No semantic search
#2
Serper
Agent devs wanting maximum free Google searches
Pros
- 2,500 free credits (most generous)
- Fast response
- Simple API
- Low cost after free
Cons
- One-time (not renewing)
- Google only
- No MCP support
- No multi-platform
#3
Tavily
Agent devs in the LangChain ecosystem
Pros
- 1,000 free/month (renewing)
- AI-optimized results
- Community MCP server
- LangChain native
Cons
- Web-only
- Local MCP server required
- No multi-platform
- Nebius uncertainty
#4
Exa
Research agent devs wanting semantic search
Pros
- 1,000 free/month
- Semantic search
- Content extraction
- Good for RAG agents
Cons
- Single platform
- Contents costs extra
- Complex pricing
- No MCP support
#5
Google Custom Search
Agent devs in Google Cloud ecosystem
Pros
- 100 free/day (renewing)
- Official Google API
- Site-restricted search
- Image search support
Cons
- 100/day cap constrains testing
- Complex setup
- No multi-platform
- No agent framework support
Side-by-Side Comparison
| Criteria | Scavio | Runner-up | 3rd Place |
|---|---|---|---|
| Free Monthly Queries | 500 (renewing) | 2,500 (one-time) | 1,000 (renewing) |
| Card Required | No | No | No |
| MCP Support | Hosted (zero setup) | None | Local server |
| Platforms on Free | 5 | 1 (Google) | 1 (web) |
| Agent Frameworks | MCP, LangChain, CrewAI | API only | LangChain |
| Free Tier Type | Renewing monthly | One-time grant | Renewing monthly |
Why Scavio Wins
- 500 free credits/mo renew every month. Unlike Serper's one-time 2,500 that runs out, Scavio's free tier sustains ongoing agent development.
- Five platforms on the free tier. Test your agent against Google, Amazon, YouTube, Reddit, and Walmart without paying for separate APIs.
- Hosted MCP with zero setup on the free tier. Add one line to your config and your agent has search within minutes.
- No credit card required to start. Sign up, get your API key, and start building immediately.
- Agent framework native: MCP, LangChain, and CrewAI work out of the box. No adapter code, no custom tool definitions, no wrapper functions.