# Best search APIs for AI agents in 2026: 9 options compared

> Best web search APIs for AI agents and LLMs in 2026: Google SERP APIs vs Tavily, Exa, Brave, Perplexity. Price per 1,000, crypto, x402, KYC. Checked 2026-10-22.

- URL: https://serpcrypto.com/best/search-apis-for-ai-agents/
- Last updated: 2026-10-22
- Publisher: SerpCrypto (https://serpcrypto.com)

An agent's web search tool can return Google's results page or an answer from a provider's own index. This page compares nine APIs on price, output, free tier, payment (including per-call crypto) and identity checks. We publish SerpCrypto, which is listed first.

**Quick answer — What is the best web search API for AI agents in 2026?**

It depends on what the agent needs. For Google's own results, rankings and AI Overview sources, use a SERP API: **SerpCrypto** charges $0.75/1K searches down to $0.30/1K searches, paid in crypto with no KYC. For answers from a dedicated index, Brave, Perplexity, Linkup and You.com list $5.00 per 1,000 and Exa from $4.00, as of 22 October 2026; Tavily lists $7.50 at entry.

## The 9 best search APIs for AI agents in 2026

**Methodology.** Published by SerpCrypto (SerpGoat LLC). Every provider is compared on the same criteria, taken from its own public website: list price per 1,000 searches, what the API returns (a search engine's results page or its own index), free tier, accepted payment methods, including per-call crypto (x402), identity or card requirements, the date the prices were checked.

*Prices checked on October 22, 2026.*

### 1. SerpCrypto — Our product

Google and Bing results pages as JSON for agents that need what users actually see: rankings, People Also Ask, local results and AI Overview sources.

- Best for: Agents grounded in Google results; builders who pay in crypto
- Price: $0.75/1K searches on 10,000 searches; $0.30/1K searches on 5,000,000 searches
- KYC: None
- Crypto payment: BTC, USDT, USDC, ETH, SOL, LTC (prepaid balance, not per call)
- Pros: Credits never expire
- Pros: Ready tool code for MCP, LangChain, OpenAI, n8n and OpenClaw
- Cons: No free tier
- Cons: Returns results, not page content or written answers
- Cons: No per-call x402 payment

### 2. Tavily

A search API built for LLM agents, which returns content prepared for a model. Nebius agreed to acquire Tavily in February 2026; Tavily keeps its brand.

- Best for: Agent frameworks that expect LLM-ready content
- Price: $7.50 per 1,000 (Project, $30 for 4,000 credits); $5.00 on Growth ($500 for 100,000); $8.00 pay as you go
- KYC: Not stated
- Crypto payment: USDC per call via x402, $0.01 a call
- Pros: 1,000 free credits a month
- Pros: Per-call crypto without an account
- Cons: Monthly credits reset
- Cons: Not Google's results page

### 3. Exa

A search engine with its own index, designed for AI applications, with two search modes priced separately.

- Best for: Semantic search over its own web index
- Price: $4.00 per 1,000 (lite) or $7.00 (auto)
- KYC: Not stated
- Crypto payment: Per-request USDC via x402
- Pros: $10 of free usage a month
- Pros: Among the fastest indices in Proxyway's March 2026 test
- Cons: Not Google's results page

### 4. Brave Search API

Results from Brave's independent index at a flat price, with a monthly credit.

- Best for: A non-Google index at a predictable flat price
- Price: $5.00 per 1,000; $5 free credit a month (about 1,000 requests)
- KYC: Credit card required, "to prevent abuse"
- Crypto payment: Not stated
- Pros: Own independent index
- Pros: Flat price
- Cons: Card required even for the free credit

### 5. Perplexity Search API

Search results from Perplexity's index, with a cheaper fast mode.

- Best for: Agents that want Perplexity's retrieval
- Price: $5.00 per 1,000; $1.00 in fast mode
- KYC: Not stated
- Crypto payment: Not stated
- Pros: Among the fastest indices in Proxyway's March 2026 test
- Pros: Low-cost fast mode
- Cons: Not Google's results page

### 6. Linkup

A search API for AI with standard and deep modes, payable per request in USDC without an account.

- Best for: Agents that pay per request with no signup
- Price: $5.00 per 1,000 (standard); $50.00 (deep)
- KYC: Professional email for the free monthly credit; none via x402
- Crypto payment: USDC on Base via x402, $0.01 a request
- Pros: No account needed with x402
- Pros: Monthly free credit
- Cons: Deep mode costs 10 times standard

### 7. You.com Web Search API

A web search API returning up to 100 results per call, with machine payments in stablecoins.

- Best for: Many results per call; agents paying in stablecoins
- Price: $5.00 per 1,000 calls
- KYC: None for machine payments
- Crypto payment: USDC via x402 (Base, Solana) and MPP
- Pros: Up to 100 results per call
- Pros: $10 free credit (about 2,000 searches)
- Cons: Not Google's results page

### 8. Serper

A low-cost Google SERP API, the usual low-price reference in published SERP API comparisons.

- Best for: High-volume Google results for agents paid by card
- Price: $1.00 per 1,000 down to $0.30 at 12.5 million
- KYC: None stated
- Crypto payment: Not mentioned
- Pros: Low price at volume
- Pros: 2,500 free queries, no card
- Cons: Credits expire after 6 months

### 9. Firecrawl search

Web search combined with page scraping, for agents that need the content of the pages they find.

- Best for: Search plus full-page content in one call
- Price: $7.60 per 1,000 at entry (2 credits per search) down to $1.50 on the Scale plan
- KYC: Not stated
- Crypto payment: Not stated
- Pros: Returns page content
- Pros: 1,000 free credits a month
- Cons: Plan credits do not roll over

*Disclosure: this page is published by SerpCrypto. Competitor details come from their public websites at the date shown above and may have changed since.*

## Does my agent need a SERP API or an AI search API?

Ask what the agent has to know. If it must know what Google shows, choose a SERP API. That covers rankings, ads, local results, the AI Overview and its sources, and fresh news cards: things only the engine's own page holds.

If it needs relevant text to answer a question, an AI search API is often simpler. Tavily, Exa, Brave, Perplexity, Linkup and You.com answer from their own index or retrieval, and some return text ready for the model.

Many agents use both: a SERP API to find and rank sources as people see them, and a fetch or extract step to read the pages. The [AI agents guide](https://serpcrypto.com/use-cases/ai-agents/) shows how to keep the SERP part small in tokens.

## Can an AI agent pay for each search in crypto?

Yes, with some AI search APIs. Linkup, You.com, Tavily and Exa accept per-request payments in USDC through x402, an HTTP payment protocol: the agent pays for a call without an account. Linkup lists $0.01 a request, Tavily $0.01 a call, and You.com $0.005 a call on x402.

SerpCrypto works differently: you top up a balance once in BTC, USDT, USDC, ETH, SOL, LTC, buy credits that never expire, and the agent uses an API key. That suits agents run by a team; per-call x402 suits fully autonomous agents. We do not offer x402 today.

## Which search APIs are fastest for agents?

The most-cited independent test is Proxyway's report of 4 March 2026, which ran 15 services three times with 2,000 requests. It found Perplexity, Exa and Tavily the fastest of the index-based APIs, and Oxylabs and Serper the fastest live SERP APIs, at a median of about 0.6 to 0.7 seconds.

We have not published speed figures for SerpCrypto; we will add them with a method and a date once measured. For an agent, total latency also depends on how much text you pass to the model, so trimming the response matters as much as the API.

## What does SerpCrypto cost for an agent?

An agent that runs 300 searches a day uses about 9,000 a month: 10,000 searches covers it for $7.50. Credits never expire, so idle weeks cost nothing.

| Plan | Quantity | Price | Price per unit |
| --- | --- | --- | --- |
| Test | 10,000 searches | $7.50 | $0.75/1K searches |
| Starter | 25,000 searches | $18.75 | $0.75/1K searches |
| Build | 100,000 searches | $56.25 | $0.56/1K searches |
| Volume | 1,000,000 searches | $375 | $0.38/1K searches |

In every plan: Every engine at 1 credit per search · Failed requests not charged · Credits never expire · Country, language, city and device targeting

**Before you pay**

- Minimum top-up $25. Top up once in crypto, then buy any plan from your balance.
- Unused balance stays on your account and never expires, and it pays for search credits. When a purchase costs less than the minimum top-up, the part added only to reach the minimum is refundable on request to support within 30 days of the payment, in USDT or USDC, as long as it has not been spent. The rest of the balance is not paid back, except where the law requires it.
- Credited once your payment is checked on the blockchain. Typical network confirmation time: BTC ≈ 20 min · USDT TRC-20 ≈ 1 min · USDT ERC-20 ≈ 5 min · USDC ERC-20 ≈ 5 min · ETH ≈ 5 min · SOL ≈ 1 min · LTC ≈ 15 min

## Search APIs for AI agents: common questions

### Which search API do Claude, ChatGPT and Cursor agents use?

Any API wrapped as a tool. Through MCP, Claude Desktop, Cursor and other clients can call a search tool you configure. Our [MCP page](https://serpcrypto.com/docs/mcp/) has a small server, and [OpenClaw](https://serpcrypto.com/docs/openclaw/) and [n8n](https://serpcrypto.com/docs/n8n/) have their own guides.

### Is there a free web search API for AI agents?

Several have free allowances: Tavily 1,000 credits a month, Exa $10 a month, Brave a $5 monthly credit with a card on file, and Serper 2,500 queries once. SerpCrypto has no free tier; its smallest pack is 10,000 searches for $7.50.

### Which search API works without a credit card?

Serper's free queries need no card, and Linkup, You.com, Tavily and Exa accept per-call USDC via x402. SerpCrypto never asks for a card: you pay in BTC, USDT, USDC, ETH, SOL, LTC with no KYC.

### What is x402?

An HTTP-based protocol for paying per request in stablecoins such as USDC, without an account. Several AI search APIs accept it for agent payments. SerpCrypto does not offer it today.

### How many tokens does a search result cost an agent?

It depends on what you pass on. Sending only the title, link and snippet of 10 organic results keeps the tool output short. The [AI agents guide](https://serpcrypto.com/use-cases/ai-agents/) shows a helper that trims our JSON before it reaches the model.

## Sources

1. [Search APIs 2026 report](https://proxyway.com/research/search-apis-2026-report) — Proxyway (2026-03-04)
2. [API credits](https://docs.tavily.com/documentation/api-credits) — Tavily (read 2026-10-22)
3. [Tavily on x402](https://tavily.com/blog/tavily-on-x402) — Tavily (read 2026-10-22)
4. [Nebius announces agreement to acquire Tavily](https://nebius.com/newsroom/nebius-announces-agreement-to-acquire-tavily-to-add-agentic-search-to-its-ai-cloud-platform) — Nebius (2026-02-10)
5. [Pricing](https://exa.ai/pricing) — Exa (read 2026-10-22)
6. [x402 guide](https://exa.ai/docs/reference/x402-guide) — Exa (read 2026-10-22)
7. [Brave Search API](https://brave.com/search/api/) — Brave (read 2026-10-22)
8. [Search API overview](https://docs.perplexity.ai/docs/search/overview.md) — Perplexity (read 2026-10-22)
9. [Pricing](https://docs.linkup.so/pages/documentation/development/pricing) — Linkup (read 2026-10-22)
10. [x402](https://docs.linkup.so/pages/documentation/platform/x402) — Linkup (read 2026-10-22)
11. [Pricing](https://you.com/pricing) — You.com (read 2026-10-22)
12. [Machine payments](https://you.com/docs/administration/machine-payments) — You.com (read 2026-10-22)
13. [Serper](https://serper.dev/) — Serper (read 2026-10-22)
14. [Pricing](https://www.firecrawl.dev/pricing) — Firecrawl (read 2026-10-22)

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SerpCrypto: SerpCrypto is a SERP API for developers and AI agents that returns Google and Bing results as JSON, paid in crypto with no ID upload. Prepaid search credits from $0.30/1K searches never expire. No KYC — no ID, no selfie, no documents. Pay in crypto.