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OnHub URL Context Q&A
x402
OnHub URL Context Q&A is a paid API for AI agents from api.onhub.ai, paid per call via x402, $0.4/call, status unknown (last checked 2026-10-02).
Fetches content from up to 3 public URLs and answers a natural language question grounded in that content, returning cited, evidence-backed answers.
Price / call$0.4
Success—
StatusUnknown
How this service works
OnHub is the pay-per-request API layer for agents. Text inference paid per request with USDC on Base.
Output
A JSON object containing a natural language answer grounded in the fetched URL content, an array of source objects with retrieval status for each URL, and an evidence_status field ('grounded') indicating the answer is attributable to the source material. Citations like [1] appear inline in the answer text.
Example use cases
Changelog summarization for product teams
“Go to https://github.com/openai/openai-python/blob/main/CHANGELOG.md and tell me what breaking changes were introduced in the last three releases.”
Competitive research from public pages
“Read https://stripe.com/pricing and https://paddle.com/pricing and answer: which one is cheaper for a SaaS company doing $50k/month in revenue?”
Documentation fact-check
“Check https://docs.aws.amazon.com/lambda/latest/dg/gettingstarted-limits.html and answer: what is the maximum deployment package size for AWS Lambda?”
Technical details
Endpoint
POSThttps://api.onhub.ai/v1/url-context?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you have specific, known URLs whose content you want to read and query against — it is ideal for targeted Q&A over documentation pages, changelogs, pricing pages, or articles where you already know the source. Prefer it over a web search endpoint when you need grounded, cited answers directly from specific URLs rather than discovering new sources. Use when you need attribution and evidence status on the answer, not just a summary.
Side effects
- URL is localhost, private network, or paywalled — retrieval fails with URL_RETRIEVAL_STATUS error
- URL points to video or audio content which is not supported
- Query is under 3 or over 2000 characters — request rejected
- More than 3 URLs submitted — request rejected
- URL content is too short or empty to answer the query — low-confidence or empty answer
- Network timeout fetching one or more URLs — partial results returned
- Non-HTTPS or malformed URL — validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urls | array | |
| query | string | The question to answer using the content of the given URLs. |
Output
Schema · Response
{
"type": "json",
"example": {
"query": "Summarize the key changes on this page",
"answer": "The changelog highlights new Workers Builds. [1]",
"object": "url_context.result",
"sources": [
{
"url": "https://developers.cloudflare.com/changelog/",
"status": "URL_RETRIEVAL_STATUS_SUCCESS"
}
],
"evidence_status": "grounded"
}
}Tags
x402
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