AgentIndex x402 Research is a paid API for AI agents from x402.agentindex.world, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-02).
Answers a research question by searching the web, verifying claims, and synthesizing a cited, fact-checked answer with source attribution
Jev-powered research: routed search, cited answer, claims verified against sources. Ask a question, get a 5-8 sentence answer, each claim tagged to a numbered source, built from real page content - no invented facts. A fast paid LLM writes it, under 4.5s guaranteed; on a rare miss, a no-LLM extractive fallback (top sentences from the sources, picked by Jev) takes over instead, marked "synthesis":"extractive". Try GET /research/sample.
A JSON object containing: a synthesized `answer` (plain text, with inline citation markers like [1][2]); a `sources` array with URL, title, source type, and published date for each reference; a `timing_ms` breakdown (total, search, verify, synthesis); and a `claims_verified` boolean with an optional `claims_verified_reason` explaining any caveats.
GEThttps://x402.agentindex.world/research?utm_source=zero.xyzChoose this endpoint when you need a synthesized, cited, fact-checked answer to a research question rather than a raw list of search results. It is especially valuable when source verification matters — e.g. fact-checking claims, investigating recent events, or producing reports that require attribution. Prefer it over a plain web-search endpoint when you want the synthesis and verification step done automatically and returned as a single structured response. Pay-per-call pricing at $0.005 USDC makes it cost-effective for on-demand agent queries without subscriptions.
| Field | Type | Description |
|---|---|---|
| query | string | The research question to answer, up to 500 characters. |
| max_sources | integer | How many web sources to consider, 1-10. Default 5. |
{
"type": "json",
"example": {
"query": "What caused the 2026 Base network congestion in September?",
"answer": "Base experienced elevated congestion in mid-September 2026 driven by a surge in memecoin launch activity on Uniswap V2/V3 and Aerodrome [1]. Average gas prices briefly spiked above typical levels during peak trading windows [1][2]. The Base team noted no protocol-level incident and attributed the load to organic demand rather than an attack [2]. Several DEX aggregators reported temporarily degraded quote latency during the same window [3]. Network conditions normalized within about a day as launch volume subsided [1].",
"sources": [
{
"url": "https://example.com/base-report",
"title": "Base network activity report",
"source": "web",
"published_at": "2026-09-15T00:00:00Z"
},
{
"url": "https://example.com/gas-tracker",
"title": "Gas price tracker",
"source": "web",
"published_at": "2026-09-16T00:00:00Z"
},
{
"url": "https://example.com/dex-status",
"title": "DEX aggregator status page",
"source": "web",
"published_at": "2026-09-15T00:00:00Z"
}
],
"timing_ms": {
"total": 3170,
"search": 1450,
"verify": 720,
"synthesis": 980
},
"claims_verified": true,
"claims_verified_reason": null
}
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