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Netzhandwerker Claim Checker
x402
Netzhandwerker Claim Checker is a paid API for AI agents from tools.netzhandwerker.de, paid per call via x402, $0.008/call, status unknown (last checked 2026-09-14).
Checks a textual claim against up to 8 source URLs and returns evidence quotes, verdict, and confidence score
Price / call$0.008
Success—
StatusUnknown
How this service works
x402-Werkzeuge für autonome Agenten.
Output
Returns a JSON object with a verdict ('in_quelle_belegt' or similar), an array of evidence quotes with direction (supporting or contradicting), confidence score (0-1), matched terms, count of supporting vs contradicting evidence, and per-source metadata including reachability, HTTP status, character count, and sentences scanned.
Example use cases
Fact-checking a news article statistic
“I read that 'The ECB raised interest rates by 25 basis points in March 2024' — can you verify that claim against these three sources: https://www.ecb.europa.eu/press/pr/date/2024/html/ecb.mp240307.en.html, https://www.reuters.com/markets/europe/, and https://www.ft.com/central-banks?”
Validating a politician's quoted statement
“Someone claimed that 'Germany's unemployment rate fell to 5.1% in Q1 2025' — please check if that's actually stated in any of these official sources: https://www.destatis.de/EN/Themes/Labour/Labour-Market/ and https://www.bundesagentur-fuer-arbeit.de”
Research assistant verifying cited figures
“Before I publish my report, can you check if the claim 'Renewable energy accounted for 46% of EU electricity in 2024' is supported by these sources: https://www.eurostat.ec.europa.eu/statistics-explained/index.php/Renewable_energy_statistics and https://www.iea.org/reports/renewables-2024?”
Technical details
Endpoint
POSThttps://tools.netzhandwerker.de/v1/claim/checkWhen to prefer
Use this endpoint when you need to check whether a specific factual claim is actually stated in one or more known source URLs, rather than searching the open web. Ideal for fact-checking pipelines, journalism tools, or research workflows where you already have candidate sources and want to verify if they support a claim — especially for numerical claims or quotes where exact matching matters.
Side effects
- Source URL unreachable or returns non-200 status — source marked as not reachable with no evidence extracted
- Claim contains no recognizable key terms — low confidence or empty evidence array
- Source URL content is not in a parseable text format (e.g. PDF, binary) — no sentences scanned
- Claim exceeds 600 character limit — request rejected
- More than 8 source URLs provided — request rejected
- Source page has no text matching claim terms — verdict may be 'nicht_belegt' with zero evidence
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| claim | string | Die zu pruefende Behauptung |
| sources | array | Bis zu acht Quell-URLs |
Output
Schema · Response
{
"type": "json",
"example": {
"note": "Belegsuche in den genannten Quellen, keine Bewertung des Wahrheitsgehalts.",
"claim": "Die Weltbank erwartet fuer 2026 ein globales Wachstum von 2,7 Prozent.",
"sources": [
{
"url": "https://www.worldbank.org/en/publication/global-economic-prospects",
"title": "Global Economic Prospects",
"status": 200,
"matches": 2,
"reachable": true,
"text_chars": 48219,
"content_type": "text/html",
"sentences_scanned": 312
}
],
"verdict": "in_quelle_belegt",
"evidence": [
{
"quote": "Global growth is projected to hold at 2.7 percent in 2026 as trade and investment recover slowly.",
"direction": "stuetzt",
"source_url": "https://www.worldbank.org/en/publication/global-economic-prospects",
"source_title": "Global Economic Prospects",
"matched_terms": [
"wachstum",
"2026"
],
"term_coverage": 0.67,
"matched_numbers": [
"2026"
]
}
],
"key_terms": [
"weltbank",
"erwartet",
"globales",
"wachstum",
"2,7",
"prozent"
],
"confidence": 0.8,
"supporting": 2,
"contradicting": 0,
"evidence_count": 2,
"numbers_in_claim": [
"2026",
"2,7 Prozent"
],
"numbers_not_found": []
}
}Tags
x402
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