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The 7 free web search APIs for AI agents are Tavily, Brave Search API, Exa, Firecrawl, SerpApi, self-hosted SearXNG, and Google Custom Search JSON API. Tavily is the best default for research agents; Brave, Exa, Firecrawl, SerpApi, and SearXNG serve different architectures, while Google is only a temporary legacy option for existing customers.
These services are not interchangeable. Some return conventional search results, some retrieve semantically relevant pages or content, one combines search with crawling, and one is software you operate yourself. Their free offers also use different units: monthly credits, fixed searches, signup credits, or infrastructure that you pay for indirectly with hosting and maintenance.
The comparison below focuses on the practical choice for an AI agent: what the service returns, how its free allowance is measured, which workflow it supports, and where the free option stops being a sensible production foundation.
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Key takeaways
- Tavily provides 1,000 free API credits per month without a credit card and is the strongest default for general research agents.
- Brave Search API provides $5 in free monthly credits, but requires a card for verification and is not an unlimited no-card plan.
- Exa combines $20 in signup credits with a recurring $10 monthly free allowance for semantic and coding-oriented retrieval.
- Firecrawl provides 1,000 free monthly credits for search, scraping, crawling, mapping, and related workflows, plus five free daily Agent preview runs.
- SerpApi offers 250 free searches per month and 50 searches per hour for structured results from familiar search properties.
- SearXNG is free, open-source, and self-hosted rather than a hosted quota-free provider; Google Custom Search JSON API is a legacy option for existing customers and is scheduled for discontinuation on January 1, 2027.
What does “free” mean for these web search APIs?
A free web search API for an AI agent usually means a limited free tier, not unlimited hosted search. Tavily, Brave Search API, Exa, Firecrawl, and SerpApi all impose a quota, credit allowance, or rate limit. SearXNG is free software that you operate yourself, while Google Custom Search JSON API offers a legacy free quota only to existing customers.
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The distinction matters because a “search” does not consume the same amount of allowance on every platform. Tavily charges one credit for basic, fast, and ultra-fast searches and two credits for advanced searches. Firecrawl charges two credits per ten search results, while scraping, crawling, mapping, and monitoring generally cost one credit per page, subject to feature-specific charges. A monthly credit balance therefore cannot be compared directly with a fixed search count.
Free-tier prices, quotas, rate limits, endpoint behavior, and eligibility can change. Verify the linked official pricing or documentation pages before putting a provider into production, and do not describe any of these hosted services as unlimited.
How do the 7 free web search APIs for AI agents compare?
The seven choices fall into four practical groups: AI-native search and retrieval, conventional search-result APIs, search-plus-content extraction, and self-hosted metasearch. Google’s API belongs in a fifth practical category: legacy compatibility.
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|---|---|---|---|---|
| Tavily | AI-native search and retrieval | 1,000 credits per month; no credit card; basic, fast, and ultra-fast searches use 1 credit, advanced uses 2 | Research agents, RAG pipelines, and prototypes needing snippets or extracted context | Credits do not equal a fixed number of searches |
| Brave Search API | Conventional search API using an independent index | $5 in free monthly credits; then $5 per 1,000 Search-plan requests; card required for verification | Broad web search, structured metadata, and agents needing a non-Google/Bing index | Free means monthly credit, not an unlimited no-card tier |
| Exa | AI-native semantic or neural retrieval | $20 in signup credits plus a recurring $10 monthly free allowance | Semantic search, coding agents, research assistants, and token-efficient page retrieval | Signup credits are not a permanent monthly quota; pricing varies by mode and result count |
| Firecrawl | Search plus scraping, crawling, mapping, and browser interaction | 1,000 credits per month; no card; five free daily Agent preview runs | Agents that discover pages and then retrieve clean page content | Free-plan rate limits are low and concurrency is limited to two requests |
| SerpApi | Hosted search-result and engine-specific API | $0 Free plan with 250 searches per month and 50 searches per hour | Structured results from Google and other familiar search properties | Smaller free allowance and dependence on the selected engine’s behavior and terms |
| SearXNG | Free, open-source, self-hosted metasearch | No hosted provider quota; you supply infrastructure and configure upstream engines | Privacy-sensitive teams, hobbyists, and operators wanting gateway control | Availability, abuse prevention, formats, and upstream terms become your responsibility |
| Google Custom Search JSON API | Legacy Google search JSON interface | 100 free queries per day for existing customers; $5 per 1,000 additional queries until discontinuation | Existing integrations needing a short-term migration bridge | Closed to new customers and scheduled for discontinuation on January 1, 2027 |
The allowance details in the table come from the providers’ official pages: Tavily pricing, Brave Search API pricing, Exa API pricing, Firecrawl pricing, and SerpApi pricing. SearXNG’s architecture and API behavior are described in the official SearXNG repository and SearXNG Search API documentation.
Which free web search API should you choose?
Choose Tavily for the most balanced general research-agent starting point, but choose another option when your agent needs a particular index, semantic retrieval, page extraction, self-hosting, or legacy compatibility.
- Choose Tavily when the agent needs configurable search depth, domain inclusion or exclusion, country preference, time ranges, answer generation, raw content, images, and usage reporting in a research-oriented endpoint.
- Choose Brave Search API when you want conventional web, news, image, or related search data from Brave’s independent search index rather than a repackaged Google or Bing result.
- Choose Exa when semantic or neural retrieval, webpage text, highlights, coding-agent workflows, or configurable search latency matter more than a simple fixed query quota.
- Choose Firecrawl when search is only the discovery step and the agent also needs scraping, crawling, mapping, monitoring, or browser interaction from the same vendor.
- Choose SerpApi when the application needs a normalized hosted interface to familiar search properties and specialized engine result types.
- Choose SearXNG when privacy and operational control justify running and maintaining your own metasearch gateway.
- Choose Google Custom Search JSON API only when an existing customer has a working integration and needs time to migrate; do not start a new product on the API.
This is an architectural shortlist, not a performance ranking. The supplied research contains official documentation and pricing evidence, but no controlled independent benchmark of result quality, freshness, latency, geographic coverage, or extraction quality.
Why is Tavily a strong default for research agents?
Tavily is a strong default when an AI agent needs search results plus useful context without assembling a separate search and extraction stack.
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The current free allocation is 1,000 API credits per month and does not require a credit card, according to Tavily’s pricing page. Basic, fast, and ultra-fast searches cost one credit; advanced searches cost two credits. A prototype that uses advanced search on every agent step will therefore exhaust the allowance twice as quickly as a prototype using one-credit search modes.
Tavily’s main trade-off is credit accounting. The free allowance is not a fixed number of searches, and pricing or endpoint behavior should be rechecked before publication or deployment.
What makes Brave Search API different?
Brave Search API is the clearest choice when an agent needs a conventional web-search index and structured search data rather than an AI-specific page-retrieval workflow.
Brave exposes web, news, image, and related search data from Brave’s independent search index. Brave positions the API as an alternative to repackaging Google or Bing results, which can matter when index independence is part of an application’s requirements. The official Brave Search API page provides the current product and pricing details.
Brave’s public pricing page advertises $5 in free monthly credits for the Search plan, priced at $5 per 1,000 requests after the free credit is consumed. Brave says a credit card is required for identity and anti-fraud verification, but the card is not charged for the free plan. That makes Brave free to try, but it is not equivalent to an unlimited, no-card free tier.
Older articles may describe Brave using a larger fixed free-query allowance. Use the current credit-based offer instead, and confirm the pricing page before relying on a particular request volume.
When is Exa the better fit?
Exa fits agents that benefit from semantic or neural retrieval and useful webpage content, especially coding agents, research assistants, and systems that need more than short search-result snippets.
Exa positions its API for AI-native search and retrieval, coding agents, research, news monitoring, and related workflows. Exa’s search endpoint provides web-search tool calls and webpage text or highlights, with configurable latency. The Exa Search reference explains the endpoint, while the Exa API pricing page lists the current allowance and search modes.
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The current offer combines $20 in signup credits with a recurring $10-per-month free allowance. The $20 signup amount should not be presented as a permanent monthly quota. Endpoint pricing also varies by search mode and result count, so estimate usage from the exact mode and number of results your agent will request.
Exa is not automatically “better” than a conventional search API. Exa is a better architectural fit when semantic retrieval and token-efficient page content are central requirements; a conventional structured-results API may be simpler when the agent only needs ranked links, titles, snippets, and metadata.
Why use Firecrawl for search and content extraction?
Firecrawl is the most natural choice of these seven when an agent must discover pages and then turn those pages into clean, usable content.
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The no-cost plan requires no card and includes 1,000 credits per month. Search costs two credits per ten results. Scraping, crawling, mapping, and monitoring generally cost one credit per page, although feature-specific charges can apply. Firecrawl also advertises five free daily Agent preview runs.
Firecrawl’s free plan has low rate limits and allows two concurrent requests. A search-plus-scrape workflow can consume credits much faster than a search-only workflow because every discovered page may trigger another billable operation. Treat Firecrawl as a content-extraction platform with search, not merely as a SERP API.
What does SerpApi offer?
SerpApi offers a simple hosted abstraction for structured search-engine results, making it useful when the application needs familiar search properties or specialized result types.
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SerpApi is a good fit for developers who need results from Google and other specialized search endpoints in a structured response. The trade-off is that the free allowance is smaller than several AI-native competitors, and the application is using a hosted scraping or search-results abstraction. Before committing, review the target engine, geographic behavior, result type, terms, and how the chosen engine handles automated requests.
Is SearXNG really a free web search API?
SearXNG is free and open-source metasearch software with an HTTP API, but SearXNG is not a hosted provider that gives you an unlimited external search quota.
SearXNG aggregates results from configured search services and databases. You install and operate the instance, select and configure engines, provide infrastructure, manage abuse prevention, and accept that upstream availability and terms may vary. The SearXNG project repository describes the software’s open-source metasearch model.
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SearXNG provides a simple HTTP Search API through the / and /search endpoints. Requests can use GET or POST, and instances can return JSON, CSV, or RSS when the operator enables those formats. The SearXNG Search API documentation describes the supported request and output behavior.
Self-hosting can provide more control over privacy, routing, and configuration, but it moves operational work to you. Public SearXNG instances may disable machine-readable formats, so a public instance should not be treated as a guaranteed production API.
Can a new project use Google Custom Search JSON API?
A new project should not choose Google Custom Search JSON API because Google’s current documentation says the API is closed to new customers and is scheduled for discontinuation on January 1, 2027.
For existing customers, Google documents 100 free queries per day. Existing customers can pay $5 per 1,000 additional queries, subject to the documented daily cap, until discontinuation. Google’s documentation dated February 18, 2026, describes the closure and quota in the Custom Search JSON API overview.
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Each request requires an API key, a Programmable Search Engine ID, and a query. Google documents the REST request requirements in Use REST to Invoke the Custom Search JSON API.
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Google Custom Search JSON API belongs in this comparison for legacy compatibility, not as a durable recommendation. Existing integrations should treat the discontinuation date as a migration deadline and evaluate a replacement before the service ends.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you evaluate a free search API before building an agent?
Evaluate the agent’s required output, real request pattern, content needs, geographic scope, failure behavior, and terms instead of selecting the largest advertised free number.
- Define the minimum response. Decide whether the agent needs ranked URLs and snippets, full webpage text, highlighted passages, images, news results, or a generated answer. Tavily and Exa expose agent-oriented retrieval features; Firecrawl adds content extraction; Brave and SerpApi emphasize structured search results; SearXNG provides an operator-controlled HTTP interface; Google provides a legacy JSON search interface.
- Calculate consumption from the actual workflow. Count searches per user request, retry behavior, number of agent turns, requested results, and any follow-up page extraction. Use credit semantics rather than dividing a monthly credit number by an assumed search cost. Tavily advanced searches use two credits, and Firecrawl search uses two credits per ten results before any page extraction is added.
- Separate discovery from extraction. A search-result API may return links, titles, snippets, and metadata without supplying the complete page. If the agent must quote or synthesize page content, choose an API with relevant content retrieval or add an extraction stage. Firecrawl is purpose-built for the combined workflow; Tavily and Exa expose raw content, webpage text, or highlights within their retrieval-oriented offerings.
- Build a provider adapter. Normalize each provider into an internal response containing the query, ranked results, URLs, titles, snippets or page text, domain information, and provider error or rate-limit status. Keep domain filters and recency controls in the adapter where the provider supports them, rather than assuming every API interprets those controls identically.
- Design for limits and failure. Record remaining credits when the provider exposes usage reporting, cap concurrency, handle HTTP errors and rate limits, and avoid retry loops that multiply usage. Firecrawl’s free plan allows two concurrent requests, while each provider’s quota and rate behavior can differ.
- Test the exact locations and content types you need. Compare freshness, search-result quality, extraction quality, latency, geographic controls, and coverage using the same queries and evaluation set. The available research does not establish a universal winner for those performance dimensions, so do not treat a nominal free quota as a quality benchmark.
- Review terms and privacy requirements. Check each provider’s current terms before storing results, sending sensitive queries, or deploying at scale. With SearXNG, review both your own operating obligations and the terms and availability of the upstream engines you configure.
What is the simplest decision framework?
The simplest decision framework is to match the API’s architecture to the agent’s output, then verify the quota and operational constraints for the expected workload.
| If the agent needs… | Start with… | Why |
|---|---|---|
| General research search with filters and extracted context | Tavily | Agent-oriented search controls, raw content options, and a 1,000-credit monthly free allocation |
| An independent conventional web index | Brave Search API | Web, news, image, and related search data from Brave’s own index |
| Semantic retrieval or coding-oriented page content | Exa | Neural search positioning, webpage text or highlights, and configurable latency |
| Search followed by scraping or crawling | Firecrawl | Search, extraction, crawling, mapping, monitoring, and browser features in one platform |
| Familiar search-engine result formats | SerpApi | Hosted structured access to Google and other specialized search properties |
| Maximum operator control and self-hosting | SearXNG | Free open-source software and a configurable HTTP metasearch interface |
| An existing Google legacy integration | Google Custom Search JSON API temporarily | Existing customers retain a documented free quota, but the API has a scheduled 2027 discontinuation |
For developers learning request design, authentication, pagination, rate limits, and integration patterns, a current REST API design book can be useful optional background reading. A book complements, but does not replace, live provider documentation; AWS also provides a free explanation of what a RESTful API is.
Bottom line
Tavily is the best general starting point for a research agent, Brave Search API is the strongest conventional-index alternative, Exa suits semantic retrieval, Firecrawl suits search-plus-scrape pipelines, SerpApi suits structured multi-engine results, and SearXNG suits teams willing to self-host. Do not build a new product on Google Custom Search JSON API: Google limits the free quota to existing customers and has scheduled the API for discontinuation on January 1, 2027.
Frequently Asked Questions
Are any of these free web search APIs unlimited?
No. Tavily, Brave Search API, Exa, Firecrawl, and SerpApi provide limited hosted free tiers rather than unlimited usage. SearXNG is free self-hosted software, but the operator still supplies infrastructure and manages upstream engines.
Is SearXNG actually a free hosted search API?
SearXNG software is free and open-source, and SearXNG exposes HTTP search endpoints, but SearXNG is not a hosted unlimited search service. You must host the instance, configure upstream search engines, manage abuse prevention, and account for upstream availability and terms.
Can new projects still use Google Custom Search JSON API?
No. Google’s current documentation says Custom Search JSON API is closed to new customers and scheduled for discontinuation on January 1, 2027. Existing customers can use the documented legacy quota temporarily, but new projects should select and test a replacement.
Should an AI agent use a search API or a search-and-scrape platform?
Choose a search-plus-content platform when the agent must discover pages and then retrieve clean page content. Firecrawl combines search with scraping and crawling, while Tavily and Exa provide retrieval-oriented content options; conventional APIs such as Brave and SerpApi are better suited to structured search results when full-page extraction is not required.
The Bottom Line
Use Tavily for a balanced research-agent prototype, Brave for an independent conventional index, Exa for semantic retrieval, Firecrawl for search plus extraction, SerpApi for structured multi-engine results, and SearXNG for self-hosted control. Treat Google Custom Search JSON API as a migration bridge only, not a new integration.
