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Claim Grounding MCP Server

by truepointmarketingpartners-dotcom Your server? Claim it
answering

Claim Grounding is answering right now. Last checked 10 min ago. It exposes 4 tools. Last commit 13 Oct 2026.

Fact-check AI answers with cited sources. Pay per call in USDC on Base via x402.

Uptime history 4 days of history
4 days agonow
100.0%
Uptime 24h
92 of 92 checks
4
Tools
read from the server
75 ms
Response time
average over 24h
0
Stars
last commit 13 Oct 2026

What changed 8

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 13 October 2026. No other catalogue keeps this.

14 Oct 2 tool descriptions were rewritten check_answer, extract_claims
14 Oct a tool changed version
13 Oct 3 tools changed the parameters they ask for check_answer, deep_verify, verify_claim
13 Oct a tool changed version2 times that day
and 1 more, back to 13 October 2026

Nothing serious here today

Today is the operative word: we check Claim Grounding every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 10 min ago.

run in your terminal
claude mcp add claim-grounding --transport http https://claim-grounding.prospectintel.workers.dev/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "claim-grounding": {
      "url": "https://claim-grounding.prospectintel.workers.dev/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.claim-grounding]
url = "https://claim-grounding.prospectintel.workers.dev/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "claim-grounding": {
      "url": "https://claim-grounding.prospectintel.workers.dev/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "claim-grounding": {
      "url": "https://claim-grounding.prospectintel.workers.dev/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

answer
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 problem_sentences. Abstained rather than guessed. Use to audit chatbot or RAG output. Price: $1.00 USDC on Base per call via x402; this MCP call returns payment instructions and POST /v1/check_answer returns the results. Read-only.
deep
deep_verify
Multi-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 is succeeded. Price: $0.75 USDC on Base per call via x402; this MCP call returns payment instructions for POST /v1/deep_verify. Read-only. Not legal, medical or compliance advice.
extract
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, opinions and predictions are marked grounding_required false. Use before verify_claim. Price: $0.05 USDC on Base per call via x402; this MCP call returns payment instructions and POST /v1/extract_claims returns the claims. Read-only.
verify
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_claim returns the verdict. For a multi-source check use deep_verify. Read-only.

Endpoints

URLTransportStateLatencyChecked
https://claim-grounding.prospectintel.workers.dev/mcp streamable-http answering 78 ms 10 min ago

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Claim Grounding — questions

Answers built from our own checks of this server.

What can Claim Grounding do?
It exposes 4 tools, read directly from the server on our last check. Among them: check_answer, deep_verify, extract_claims, verify_claim. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Claim Grounding working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 75 ms. The bar chart above shows every period we have measured.
How do I connect Claim Grounding?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Claim Grounding need an API key?
No. Claim Grounding completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Claim Grounding?
It answers our handshake in 75 ms on average, which is faster than 90% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Claim Grounding open source?
We cannot say either way: 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.