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SignalHarness Web Metadata Extractor
x402
SignalHarness Web Metadata Extractor is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Extracts structured web metadata (Open Graph, JSON-LD, Twitter cards, robots, icons, content type) from a given URL or raw HTML.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing extracted structured metadata from the target webpage, including: Open Graph properties, JSON-LD objects, Twitter card tags, robots directives, page icons, content type, alternate language links, and any parsing warnings. Also includes a receipt with payment confirmation, latency, and execution details.
Example use cases
SEO audit for a landing page
“Grab the Open Graph tags, JSON-LD structured data, and Twitter card metadata from https://mycompany.com/landing-page so I can audit what gets shown when people share it on social media.”
Enrich link previews in a feed
“I have this URL https://techcrunch.com/2024/01/ai-startups — can you extract its Open Graph image, title, description, and any JSON-LD so I can build a rich link preview card?”
Check for alternate language versions
“Look up https://wikipedia.org/wiki/Artificial_intelligence and tell me all the alternate language URLs, plus any robots directives and the content type that come back in the metadata.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/web_metadata_extract/invokeWhen to prefer
Choose this endpoint when you need to extract all standard web metadata formats (OG, JSON-LD, Twitter cards, robots, icons) from a single URL in one call at very low cost ($0.01 USDC). Prefer it over general scraping tools when the goal is specifically structured SEO/social metadata rather than full page content, and over browser automation when you don't need JavaScript rendering.
Side effects
- URL is not reachable or returns non-2xx HTTP status
- HTML content exceeds 65,536 character limit
- URL does not start with https:// (pattern validation failure)
- Page has no structured metadata — returns empty arrays for all fields
- Network timeout fetching the remote URL
- Malformed HTML that cannot be parsed cleanly — warnings array may be populated
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | |
| html | string | |
| baseUrl | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"icons": [
{
"href": "example",
"sizes": "example",
"relation": "example"
}
],
"jsonLd": [
"{\"example\":\"schema-valid caller-supplied data\"}"
],
"robots": [
"example"
],
"twitter": [
{
"name": "example",
"value": "example"
}
],
"warnings": [
"Verify the caller-supplied data before relying on this result."
],
"openGraph": [
{
"name": "example",
"value": "example"
}
],
"contentType": "Example caller-supplied content.",
"alternateLanguages": [
{
"href": "example",
"language": "example"
}
]
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "web_metadata_extract",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "6fd2a8bfad3dba7e59252456d43728a949ecd09f865325d69489315168e8e7ad",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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