build-with-exa

Build with Exa

Scope

Included by default:

• Core retrieval APIs: search endpoint, contents endpoint, answer endpoint
• Long-running research workflows: Agent API (/agent)
• Async and recurring workflows: Monitors API
• Legacy surface: Websets API (existing integrations only; new collection-building work uses the Agent API)
• SDK guidance: Python exa-py, TypeScript exa-js

Note on data retention: /search, /answer, and /agent/ offer Zero Data Retention (ZDR). Websets and Monitors are not ZDR. If a use case requires ZDR, stay on the ZDR surfaces or contact Exa.

Installation

# Python
pip install exa-py

# TypeScript / JavaScript
npm install exa-js

Install the latest SDK release with the package manager so it resolves the latest release and all SDK surfaces will be available.

Authentication

export EXA_API_KEY="your_api_key_here"

Exa accepts either the x-api-key header or Authorization: Bearer <key>.

The recommended Exa search request is the query plus token-efficient content extraction, and nothing else. Content extraction is a recommendation, not a server default: omit contents and results carry only metadata (title, URL, dates), no page content.

{
  "query": "latest developments in LLMs",
  "type": "auto",
  "contents": { "highlights": true }
}

Every other request field is gated: add it only when the user's task explicitly requires it. Do not restate server defaults, and do not add controls because they seem plausibly useful. In particular:

• type defaults to auto; stating type: "auto" explicitly is fine, but do not send another mode unless the task requires it (for example a latency-critical UX or deep synthesis).
• numResults defaults to 10; omit numResults unless the task requires a different number of results. Set it only as an intentional product decision, not as boilerplate.
• Omit category. Use it only when the user explicitly asks for category-constrained retrieval.
• includeDomains and excludeDomains should be set only when the user explicitly requests a hard allowlist or blocklist and supplies or approves its contents. Express source preferences through query phrasing or systemPrompt instead.
• maxAgeHours should be set only when extracted page content must be current. It caps cache age before a live crawl; it is not a publication-recency filter.
• For "recent stories" tasks, put the recency in the query ("latest", "recent"). startPublishedDate / endPublishedDate are hard filters that drop undated and misdated pages; add them only when the task states a bounded window that must be enforced ("from the last seven days", "published in 2026"). Do not reach for maxAgeHours.
• highlights should be set to true by default for all tasks unless otherwise specified. Do not add maxCharacters or other highlight options without an explicit budget requirement in the task.

API Decision Workflow

Before picking an endpoint, decide which workflow shape fits:

• Raw web content for your own LLM or agent: use /search with the recommended request above
• Synthesized structured output: use /search and add outputSchema (and systemPrompt if behavior guidance is needed)
• Long-running multi-step research, list-building, or enrichment with structured output: use the Agent API (/agent)

Default to the search endpoint. Use the search endpoint (/search) for most new integrations, then move to a more specialized Exa surface only when the task shape clearly calls for it.

1. Need general semantic web retrieval, synthesized output, or content extraction from search results: use the search endpoint (/search)
2. Already know the URLs and need clean page extraction or freshness controls: use the contents endpoint (/contents)
3. Need pages related to a known seed URL: use the search endpoint (/search) with a query derived from the page (for example title, topic, or text from /contents)
4. Need a grounded answer with citations and no LLM of your own doing generation: use the answer endpoint (/answer). If the product already has a chat LLM, give it /search as a tool instead.
5. Need OpenAI SDK drop-in compatibility for chat or responses clients: use the OpenAI-compatible endpoints (/chat/completions, /responses)
6. Need asynchronous multi-step research, list-building, enrichment, or follow-up questions over prior research: use the Agent API (/agent)
7. Need scheduled recurring search with webhook delivery: use the Monitors API (/monitors)
8. Maintaining an existing Websets integration: see the migration guide (references/migrate-websets-to-agent.md) and transition to the Agent API (references/agent.md). Do not use Websets for new work; use the Agent API instead.

Quick Start

For more complete examples, see the relevant reference file in the table below.

Python (/search):

from exa_py import Exa

exa = Exa(api_key="YOUR_EXA_API_KEY")
result = exa.search(
    "latest developments in LLMs",
    type="auto",
    contents={"highlights": True}
)

for item in result.results:
    print(item.title, item.url)

TypeScript (/search):

import Exa from "exa-js";

const exa = new Exa();
const result = await exa.search("latest developments in LLMs", {
  type: "auto",
  contents: { highlights: true }
});

for (const item of result.results) {
  console.log(item.title, item.url);
}

Raw HTTP (/search):

curl -X POST "https://api.exa.ai/search" \
  -H "Content-Type: application/json" \
  -H "x-api-key: $EXA_API_KEY" \
  -d '{
    "query": "latest developments in LLMs",
    "type": "auto",
    "contents": {
      "highlights": true
    }
  }'

Critical Pitfalls

• Do not decorate the recommended request without reason. Adding category, domain filters, boilerplate numResults, or freshness controls without an explicit task requirement is the most common integration mistake.
• On the search endpoint, text, highlights, and summary belong inside contents, not at the top level.
• On the contents endpoint, text, highlights, and summary are top-level fields, not nested inside contents.
• Pick one of highlights, text, or summary. Do not stack them. summary requires an explicit user request for Exa-side per-result synthesis.
• Almost all tasks should use bare highlights: true. numSentences and highlightsPerUrl are deprecated, and maxCharacters needs an explicit budget requirement.
• List-building and enrichment workflows belong on the Agent API (/agent), not on /search with category: "people" or category: "company". Those categories are only for retrieving raw people or company documents.
• maxAgeHours controls crawl/cache freshness (how old extracted page content may be before a live crawl), not publication recency. Do not use it as a "recent results" control; recency belongs in query phrasing. startPublishedDate / endPublishedDate are for task-stated bounded windows ("the last seven days", "in 2026") that must be enforced, not for "recent" or "latest" alone.
• Never invent category values like github, documentation, qa, or pdf. When a user does request category-constrained retrieval, check the search reference first: specialized categories such as people and company restrict which filters are valid.
• OpenAI-compatible endpoints are for compatibility-first use cases. Prefer native Exa endpoints for new integrations when you want clearer request semantics.
• Do not treat /agent as a drop-in replacement for /search. It is higher-latency and async, so use the dedicated Agent reference when that workflow shape is the real fit. Prefer it over Websets for new collection-building work.
• Agent requests should always set effort explicitly, wait for a terminal status via polling or SSE and check how the run ended before reading output, and expose output.grounding when relevant in a product.
• Treat /findSimilar as deprecated. Prefer /search (optionally after /contents on the seed URL) for related-page discovery.

Reference Files

Canonical Docs

• Docs home: https://exa.ai/docs
• Documentation index: https://exa.ai/docs/llms.txt
• Search reference: https://exa.ai/docs/reference/search
• Agent API guide: https://exa.ai/docs/reference/agent-api-guide
• Exa Connect overview: https://exa.ai/docs/reference/agent-api/connect/overview
• Python SDK spec: https://exa.ai/docs/sdks/python-sdk-specification
• TypeScript SDK spec: https://exa.ai/docs/sdks/typescript-sdk-specification