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Exa Grounded Answer
x402
Exa Grounded Answer is a paid API for AI agents from agent402.tools, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Ask a natural language question and receive a model-generated written answer with citations (title, URL, published date) sourced from Exa's web index.
Price / call$0.01
Success—
StatusUnknown
How this service works
Ask a question and get a written answer with the sources it was drawn from. Exa searches its index, reads the pages and composes the answer, returning the citation list (title, URL, published date) alongside it so every claim can be checked. Model-backed: the answer text is generated, the citations are retrieved.
Output
A model-generated prose answer to the submitted question, accompanied by a structured citation list. Each citation includes the page title, URL, and published date. Optionally, the full text of each cited page can be included (at additional cost per page). This lets the agent or user verify every claim against its original source.
Example use cases
Cited research on a policy topic
“What are the arguments for and against universal basic income? I want a written summary with the sources it's based on so I can verify each claim.”
Fact-checking a news claim
“Someone told me that electric vehicles have a higher lifetime carbon footprint than gas cars — can you look that up and give me a sourced answer explaining what the evidence actually says?”
Competitive landscape research
“What are the key differences between the major large language model providers right now? Give me a grounded answer with citations I can follow up on.”
Technical details
Endpoint
POSThttps://agent402.tools/api/exa-answerWhen to prefer
Choose this endpoint when you need a synthesized, human-readable answer to a factual question AND you need verifiable citations alongside it. It is superior to a raw search endpoint when the user wants a composed response rather than a list of links, and better than a generic LLM when groundedness and source attribution matter. Ideal for research tasks, fact-checking, competitive analysis, or any situation where the agent must show its work.
Side effects
- Query exceeds 1000 character limit — request rejected
- No relevant sources found in Exa's index for niche or very recent topics — sparse or low-quality answer returned
- Ambiguous query leads to off-topic citations
- Full page text flag enabled for many sources drives up cost unexpectedly
- Network or index latency causes timeout on complex queries
- Payment of $0.01 USDC not satisfied — request blocked by x402 paywall
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| text | boolean | Include the full page text of each citation (bills extra per page; default false). |
| query | string | The question to answer (max 1000 chars). |
Tags
x402
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