Claim Grounding
Fact-check AI answers with cited sources. Pay per call in USDC on Base via x402.
Connect it
Settings → Connectors → Add custom connector
URL: https://claim-grounding.prospectintel.workers.dev/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://claim-grounding.prospectintel.workers.dev/mcp{
"mcpServers": {
"claim-grounding": {
"url": "https://claim-grounding.prospectintel.workers.dev/mcp"
}
}
}claude mcp add --transport http claim-grounding https://claim-grounding.prospectintel.workers.dev/mcp{
"servers": {
"claim-grounding": {
"type": "http",
"url": "https://claim-grounding.prospectintel.workers.dev/mcp"
}
}
}4 tools, verified live
extract_claimsread-onlySplit a text (for example an AI-generated answer) into atomic factual claims. Each claim includes span, grounding_required, claim_type (number|date|quantity|quote|named_entity_fact|comparison|opinion|prediction|other), check_worthiness (high|medium|low), and the source sentence. Hedges are stripped, pronouns are resolved across sentences, and compound sentences are split. Questions, greetings, opi
verify_claimread-onlyCheck one factual claim against public Wikipedia sources and return a verdict (supported, contradicted, outdated, mixed or insufficient_evidence), a confidence score, a short reason, the supporting quote and the source URL. Says insufficient_evidence instead of guessing. Price: $1.00 USDC on Base per call via x402; this MCP call returns payment instructions and the paid HTTP route POST /v1/verify_
check_answerread-onlyFact-check a whole answer: extracts every checkable claim and verifies each against Wikipedia, plus Wikidata structured facts for dates, numbers, quantities, ordinals and records. Returns per-claim verdict, confidence, quote, source URL, sentence span and suggested_correction (quoted only from cited sources when contradicted/outdated), plus an answer-level summary with overall_verdict, counts and
deep_verifyread-onlyMulti-source verification of up to three claims in a text against Wikipedia, Wikidata, Google News, Europe PMC (PubMed studies), FRED (US economic data) and SEC EDGAR (US company filings). Returns verdict, confidence, evidence for and against with quotes and URLs, and flags contradiction when sources disagree. Async: the paid call returns a job_id; poll GET /v1/jobs/{job_id} for free until status
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