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agent402.tools Answer — AI-synthesized answer with live web citations
x402
agent402.tools Answer — AI-synthesized answer with live web citations is a paid API for AI agents from agent402.tools, paid per call via x402, $0.03/call, status unknown (last checked 2026-10-09).
Returns an AI-generated prose answer to a natural-language question, grounded in live web search results, along with a structured citations array (URL, snippet, favicon).
Price / call$0.03
Success—
StatusUnknown
How this service works
A synthesized answer to a natural-language question, grounded in a live web search and returned with source citations (URL, snippet). Use it when an agent needs a direct, current answer plus the receipts to verify or follow up, instead of reading several pages itself.
Output
A clean prose answer synthesized from live web search results, plus a structured citations array containing the source URL, a relevant snippet, and a favicon for each source used — grounded in real-time web data rather than the model's training knowledge.
Example use cases
Example prompt
“What are the latest developments in the EU AI Act as of this week — give me a clear summary with sources I can check?”
Technical details
Endpoint
GEThttps://agent402.tools/api/answer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a synthesized, human-readable answer to a factual or research question AND want verifiable source citations — especially when the question requires current information beyond training data. Prefer this over a raw search endpoint when you want the model to synthesize results into prose rather than just returning a list of links. Prefer this over a general LLM when you need live grounding and source receipts.
Side effects
- Question exceeds 400 characters — truncate or rephrase
- No live web results found for the query — returns empty citations or degraded answer
- Invalid country or language code — falls back to defaults (us/en)
- max_tokens set below minimum of 64 — rejected with validation error
- Payment of 0.03 USDC not completed — 402 Payment Required response
- Search index temporarily unavailable — 503 or timeout error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"query": "what is the x402 payment protocol?",
"answer": "x402 is an open standard for internet-native, pay-per-request HTTP APIs that uses the HTTP 402 \"Payment Required\" status code to negotiate and settle micro-payments inline with the original request.",
"citations": [
{
"url": "https://www.x402.org/",
"number": 1,
"favicon": "https://imgs.search.brave.com/...",
"snippet": "x402: An open standard for internet-native payments."
}
],
"citationCount": 1
}
}Tags
x402
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