Claim Grounding
Fact-check AI answers with cited sources. Pay per call in USDC on Base via x402.
| Endpoint | https://claim-grounding.prospectintel.workers.dev/mcp (streamable-http) |
|---|---|
| Registry version | 1.4.7 |
| Now | 4 tools · grade A (90) · pin ts_39b9fd486474870c7f2bdbfb4dbbc4fe · protocol 2025-06-18 |
| First / last listed | 2026-11-02 00:30 UTC / 2026-11-02 00:30 UTC |
| Grade over time | 2026-11-02: A (90), 4 tools |
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Tools: extract_claims verify_claim check_answer deep_verify
extract_claims | Split 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 params: text* |
verify_claim | Check one factual claim against public Wikipedia sources and return a verdict (supported, contradicted, outdated, mixed or insufficient_evidence), a confidence score, a short reason, the supporting quote and the source URL.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_ params: claim*, sources, sources_only |
check_answer | Fact-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confidence, quote, source URL, sentence span and suggested_correction (quoted only from cited sources when contradicted/outdated), plus an answer-level summary with overall_verdict, counts and params: answer*, sources, sources_only |
deep_verify | Use when a claim is high-stakes, or when check_answer or extract_claims marks it unsure (their next_step gives the exact request). Verifies up to three claims against Wikipedia, Wikidata, Google News, Europe PMC, FRED and SEC EDGAR; returns verdict, confidence, evidence for and against with URLs, and flags contradictions. Async: poll GET /v1/jobs/{job_id} free. $0.75 USDC on Base via x402. Read-on params: answer*, sources, sources_only |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.