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HARS-Zero Signal URL Fetch & Content Extraction API
x402
HARS-Zero Signal URL Fetch & Content Extraction API is a paid API for AI agents from hars.cryptotavern.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-14).
Fetches a URL and returns clean markdown content plus structured metadata (title, canonical URL, OG tags, content type, confidence score, and optional next-best-action hint) for AI agent consumption.
Price / call$0.001
Success—
StatusUnknown
How this service works
Utility API for AI agents — fetch URLs, extract structured HTML, summarize text, get live FX rates, and geocode addresses. Pay per call in USDC on Base or Solana via x402. No API keys, no subscriptions. Sub-cent pricing optimized for high-volume agent loops.
Output
Returns a JSON object containing: the resolved URL, page title, clean markdown of the page body, OG image URL, OG description, canonical URL, content-type, HTTP status code, page size in bytes, RFC3339 as_of timestamp, a boolean truncated flag, a confidence score (0.0–1.0), optional arrays of risk strings and evidence URLs, optional Polymarket market_ids, and an optional next_best_action object suggesting a follow-up endpoint with reasoning and price.
Example use cases
Research article summarization for agent
“Go fetch https://www.bbc.com/news/world-us-canada-12345678 and pull out the title, the clean article text as markdown, and the publication timestamp so I can summarize it.”
Competitor landing page monitoring
“Fetch https://www.competitor.com/pricing and return the full page as markdown along with the canonical URL and confidence score — I want to track what their pricing page says.”
Evidence gathering for prediction markets
“Pull the content from https://apnews.com/article/election-results-2025 and return the markdown text plus any Polymarket evidence links you find, so I can verify the outcome of this event.”
Technical details
Endpoint
GEThttps://hars.cryptotavern.xyz/paid/fetchWhen to prefer
Choose this endpoint when an AI agent needs to fetch and read arbitrary live web content without managing API keys or subscriptions, especially in high-volume loops where sub-cent per-call pricing matters. It is ideal when you need both clean readable markdown AND structured metadata (OG tags, canonical URL, confidence score) in a single call. Prefer it over generic HTTP fetch when you want the content pre-processed into markdown with structured fields your agent can act on directly. The built-in next_best_action hint makes it useful in multi-step agent pipelines that need guidance on follow-up calls.
Side effects
- Target URL is unreachable or returns a non-200 status — status field will reflect the HTTP error code
- Page content is too large and gets truncated — truncated field set to true with partial markdown
- URL is malformed or not a valid URI — request validation error
- Target site blocks crawlers — may return empty or low-confidence markdown
- Confidence score near 0 indicating extraction was unreliable
- Payment via x402 fails or is rejected — 402 response before content is returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| urlrequired | string | |
| size | integer | |
| as_ofrequired | string | RFC3339 timestamp |
| risks | array | |
| titlerequired | string | |
| status | integer | |
| product | string | |
| evidence | array | Polymarket order book / event / reference URLs |
| markdownrequired | string | |
| og_image | string | |
| canonical | string | |
| final_url | string | |
| truncated | boolean | |
| confidence | number | Model confidence 0.0-1.0 |
| market_ids | array | Polymarket slugs or ids referenced in this response |
| content_type | string | |
| og_description | string | |
| next_best_action | object |
Output
Schema · Response
| Field | Type | Description |
|---|---|---|
| urlrequired | string | |
| size | integer | |
| as_ofrequired | string | RFC3339 timestamp |
| risks | array | |
| titlerequired | string | |
| status | integer | |
| product | string | |
| evidence | array | Polymarket order book / event / reference URLs |
| markdownrequired | string | |
| og_image | string | |
| canonical | string | |
| final_url | string | |
| truncated | boolean | |
| confidence | number | Model confidence 0.0-1.0 |
| market_ids | array | Polymarket slugs or ids referenced in this response |
| content_type | string | |
| og_description | string | |
| next_best_action | object |
Tags
x402
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