Best AI Search & Retrieval APIs for small businesses
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Crail tracks 6 AI Search & Retrieval APIs vendors that list small businesses as a fit. These are the 5 that rank highest once the list is weighted for small businesses, and each one is shown with the published entry price, what that tier actually includes, and whether you can try it first — the facts that decide the shortlist at this size, rather than the same summary on every page.
How this list is weighted for small businesses
- 60% of the vendor's Crail agent-readiness score
- 15 points for a published free tier
- 15 points for being buyable self-serve, without a sales call
- up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75)
Startups and small businesses share the price-and-self-serve weighting; midmarket and enterprise share the compliance weighting. The full rules are on the methodology page.
1. Exa80/100 agent-readiness
Search engine and API built for AI agents, offering semantic web search, content retrieval, and agentic research tools.
- Pricing model: usage-based
- Entry paid tier: Search at $7 (usage-based), 1,000 requests (up to 10 results)
- Free trial: none published, but there is an ongoing free tier
- Buy self-serve: yes
2. Brave Search API76/100 agent-readiness
Independent web index search API with Search and Answers plans, SOC 2 Type II attested, and an official MCP server for AI agents.
- Pricing model: hybrid
- Entry paid tier: Search at $5 (usage-based), $5 per 1,000 requests; $5 free credits per month
- Free trial: none published, but there is an ongoing free tier
- Buy self-serve: yes
3. Serper59/100 agent-readiness
Low-cost, high-speed Google Search API (SERP data) for AI agents, RAG pipelines, and SEO tools, billed per-query with no subscription.
- Pricing model: usage-based
- Entry paid tier: Starter at $50 one-time, 50,000 credits ($1.00 per 1,000 queries)
- Free trial: none published, but there is an ongoing free tier
- Buy self-serve: yes
4. Perplexity Sonar API87/100 agent-readiness
Usage-based Sonar model API for real-time, citation-backed web search and Q&A, alongside standalone Search and Embeddings APIs.
- Pricing model: usage-based
- Entry paid tier: Search API at $5 (usage-based), $5 per 1,000 search requests
- Free trial: none published
- Buy self-serve: yes
5. Tavily79/100 agent-readiness
Search API built for AI agents, providing real-time web search, extraction, crawling, mapping, and research endpoints.
- Pricing model: usage-based
- Entry paid tier: no price published, quoted on request
- Free trial: none published, but there is an ongoing free tier
- Buy self-serve: no, sales call required
FAQ
How is this AI Search & Retrieval APIs ranking calculated for small businesses?
This is not the raw agent-readiness leaderboard. Crail scores the 6 AI Search & Retrieval APIs vendors it tracks that fit small businesses, using 60% of the vendor's Crail agent-readiness score; 15 points for a published free tier; 15 points for being buyable self-serve, without a sales call; up to 10 points for a low entry price (free tier, then a cheapest paid tier under $30, then under $75). Exa ranks first once the small businesses weighting is applied, even though Perplexity Sonar API scores higher on raw agent-readiness (87/100 against Exa's 80/100), because the weighting adds points that score does not cover.
What does the cheapest paid plan on this list cost?
None of them publish a monthly entry price. Exa ($7 (usage-based)), Brave Search API ($5 (usage-based)), Serper ($50 one-time) and Perplexity Sonar API ($5 (usage-based)) are priced on a different basis, so they do not compare directly. Tavily publishes no paid price and quotes on request.
Can a small business trial these before committing?
None of them publish a fixed-length free trial. Exa, Brave Search API, Serper and Tavily offer an ongoing free tier instead, which is the usual way in to this list.