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Toll402 Trusted-Source Lookup & Synthesis
x402
Toll402 Trusted-Source Lookup & Synthesis is a paid API for AI agents from toll402.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Retrieves cited passages from trusted sources (Wikipedia, Wikidata, arXiv, Crossref, World Bank) for a query, optionally synthesizing an LLM answer that cites those passages.
Price / call$0.01
Success—
StatusUnknown
How this service works
Answer from TRUSTED sources only (Wikipedia, Wikidata, arXiv, Crossref/DOI, World Bank): returns passages with URL, reliability tier and retrieval time for citation. With synthesize=true you also get an LLM answer that cites the passages and admits when they don't contain the answer.
Output
Returns a JSON object with an array of passages, each containing a snippet, title, source name, URL, reliability tier integer, and ISO retrieval timestamp. If synthesize=true and an LLM key is available, also returns an LLM-generated answer that inline-cites the passages and explicitly states when the sources do not contain sufficient information.
Example use cases
Cited answer for research paper
“I'm writing about climate tipping points — pull passages from Wikipedia, arXiv, and the World Bank on this topic and give me a synthesized answer with citations I can actually use in my paper.”
Fact-check a scientific claim
“I've heard that CRISPR editing can cure sickle-cell disease — look this up across Wikipedia and arXiv and return cited snippets with their reliability tiers so I can verify the claim.”
Quick Wikidata and Crossref lookup
“What does Wikidata and Crossref say about Marie Curie's Nobel Prizes? Just give me the passages with their source URLs, no synthesis needed — I want to see the raw citations.”
Technical details
Endpoint
GEThttps://toll402.dev/v1/lookupWhen to prefer
Choose this endpoint when you need factual answers grounded in identifiable, citable sources with reliability tiers — especially for academic, encyclopedic, or economic questions where provenance and citation matter. Prefer it over general web search when you need traceable references (DOIs, Wikidata IDs, Wikipedia URLs) rather than raw web results. It is particularly strong for research assistance, fact-checking pipelines, and citation generation where the agent must admit uncertainty rather than hallucinate.
Side effects
- Query too short (< 2 chars) or too long (> 500 chars) → validation error
- Requested source not in allowed enum → schema validation error
- No relevant passages found in specified sources → empty passages array
- LLM synthesis unavailable if server lacks LLM key → synthesis field absent or error
- Upstream source (arXiv, World Bank, etc.) temporarily unavailable → partial results or timeout
- Payment not completed via x402 protocol → 402 response before query is processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"passages": [
{
"url": "https://en.wikipedia.org/wiki/List_of_HTTP_status_codes",
"tier": 1,
"title": "List of HTTP status codes",
"source": "wikipedia",
"snippet": "...",
"retrievedAt": "2026-09-07T00:00:00Z"
}
]
}
}Tags
x402
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