Hacker News Topic Sentiment
Fetch recent Hacker News stories for a topic and apply a transparent keyword-lexicon sentiment score.
Preview request
The preview path is rate-limited and does not charge. Production requests use the same parameters and return a standard x402 challenge when no payment signature is present.
curl --request GET \ "https://ai-data-marketplace-1042299154756.us-central1.run.app/api/v1/news_sentiment?preview=true&entity=Microsoft&days=1"
Input contract
| Parameter | Type | Required | Description |
|---|---|---|---|
entity | string | Yes | Company, brand, or person name. |
days | integer | No | Lookback period in days. |
Guaranteed response metadata
Every successful product response identifies how the result was produced. Product-specific output fields are documented in the paid OpenAPI contract and can be inspected through the preview request where available.
{
"marketplace_metadata": {
"data_mode": "live_source",
"billable": true,
"availability": "operational",
"source": "Hacker News Algolia API plus deterministic lexicon"
}
}Agent payment flow
Request the product, read the base64 PAYMENT-REQUIRED challenge, sign the exact Base-USDC authorization with an x402 buyer client, and retry using PAYMENT-SIGNATURE. A successful response includes PAYMENT-RESPONSE.