Claim Grounding
Fact-check AI answers with cited sources. Pay per call in USDC on Base via x402.
我该使用它吗
质量与安全性
A
基于对工具定义和协议合规性的自动分析。
上下文开销
~2,502token 数（工具定义）
~6.0 KB典型响应大小
对注意力有中等影响（占 128k 上下文窗口的 1.95%）
这是每次将服务器的工具加载到模型上下文窗口时所消耗的大致 token 数。数值越高，可用于其他任务的注意力就越少。
安装
一键安装
将以下内容添加到你的 `claude_desktop_config.json` 文件中：
{
"mcpServers": {
"claim-grounding": {
"url": "https://claim-grounding.prospectintel.workers.dev/mcp"
}
}
}远程端点
https://claim-grounding.prospectintel.workers.dev/mcpstreamable-http它能做什么
工具清单
工具（4）
🟢 只读🟡 写入🔴 删除⚪ 未知
🟢extract_claims(text)
Split a text (for example an AI-generated answer) into atomic factual claims, each with its character span and a grounding_required flag that says whether it is a checkable fact (questions, greetings and opinions are flagged false). Use it before verify_claim to decide what to check. Price: $0.05 USDC on Base per call via x402; this MCP call returns payment instructions and the paid HTTP route POST /v1/extract_claims returns the claims. Read-only, no side effects.
输入模式
{
"type": "object",
"properties": {
"text": {
"type": "string",
"description": "The text to split into claims, for example a chatbot answer. Up to a few thousand characters.",
"minLength": 1,
"examples": [
"The Eiffel Tower is in Paris and was completed in 1889."
]
}
},
"required": [
"text"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": [
"payment_required",
"ok"
],
"description": "payment_required: pay the HTTP route with x402 to get the result. ok: result is included."
},
"tool": {
"type": "string",
"description": "Tool name."
},
"payment": {
"type": "object",
"description": "Payment instructions. MCP tools/call does not charge or run the paid work; call the HTTP route with x402.",
"properties": {
"protocol": {
"type": "string",
"description": "Payment protocol, always x402 (v2)."
},
"method": {
"type": "string",
"description": "HTTP method for the paid route."
},
"url": {
"type": "string",
"description": "Paid HTTP route to call."
},
"price": {
"type": "string",
"description": "Price in USD, paid as USDC."
},
"amount": {
"type": "string",
"description": "Price in USDC base units (6 decimals)."
},
"network": {
"type": "string",
"description": "CAIP-2 network id (eip155:8453 = Base mainnet)."
},
"asset": {
"type": "string",
"description": "USDC contract address on Base."
},
"pay_to": {
"type": "string",
"description": "Receiving wallet address."
},
"body": {
"type": "object",
"description": "JSON body to POST (the tool arguments you sent).",
"additionalProperties": true
},
"how": {
"type": "string",
"description": "Step-by-step payment flow."
}
},
"required": [
"protocol",
"method",
"url",
"price",
"network"
]
},
"result": {
"type": "object",
"description": "Paid result: { claims: [{ claim_id, text, span: { start, end }, grounding_required }], priced_usd }.",
"properties": {
"claims": {
"type": "array",
"items": {
"type": "object"
}
},
"priced_usd": {
"type": "number"
}
},
"additionalProperties": true
},
"message": {
"type": "string",
"description": "Human-readable summary."
}
},
"required": [
"status",
"tool",
"message"
],
"additionalProperties": true
}🟢verify_claim(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.
输入模式
{
"type": "object",
"properties": {
"claim": {
"type": "string",
"description": "One factual sentence to check.",
"minLength": 1,
"examples": [
"The Eiffel Tower is in Paris."
]
}
},
"required": [
"claim"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": [
"payment_required",
"ok"
],
"description": "payment_required: pay the HTTP route with x402 to get the result. ok: result is included."
},
"tool": {
"type": "string",
"description": "Tool name."
},
"payment": {
"type": "object",
"description": "Payment instructions. MCP tools/call does not charge or run the paid work; call the HTTP route with x402.",
"properties": {
"protocol": {
"type": "string",
"description": "Payment protocol, always x402 (v2)."
},
"method": {
"type": "string",
"description": "HTTP method for the paid route."
},
"url": {
"type": "string",
"description": "Paid HTTP route to call."
},
"price": {
"type": "string",
"description": "Price in USD, paid as USDC."
},
"amount": {
"type": "string",
"description": "Price in USDC base units (6 decimals)."
},
"network": {
"type": "string",
"description": "CAIP-2 network id (eip155:8453 = Base mainnet)."
},
"asset": {
"type": "string",
"description": "USDC contract address on Base."
},
"pay_to": {
"type": "string",
"description": "Receiving wallet address."
},
"body": {
"type": "object",
"description": "JSON body to POST (the tool arguments you sent).",
"additionalProperties": true
},
"how": {
"type": "string",
"description": "Step-by-step payment flow."
}
},
"required": [
"protocol",
"method",
"url",
"price",
"network"
]
},
"result": {
"type": "object",
"description": "Paid result: { mode, claim: { text, verdict, confidence, rationale_short, citations[] }, why, source, receipt }.",
"properties": {
"claim": {
"type": "object",
"properties": {
"claim_id": {
"type": "string"
},
"text": {
"type": "string"
},
"verdict": {
"type": "string"
},
"confidence": {
"type": "number"
},
"citations": {
"type": "array",
"items": {
"type": "object"
}
}
}
},
"why": {
"type": "string"
},
"source": {
"type": [
"string",
"null"
]
}
},
"additionalProperties": true
},
"message": {
"type": "string",
"description": "Human-readable summary."
}
},
"required": [
"status",
"tool",
"message"
],
"additionalProperties": true
}🟢check_answer(answer)
Fact-check a whole answer: extracts every checkable claim and verifies each one against public Wikipedia sources, returning a verdict, confidence, quote and source URL per claim plus suggested next actions. Use it to audit chatbot or RAG output before showing it to a user. Price: $1.00 USDC on Base per call via x402; this MCP call returns payment instructions and the paid HTTP route POST /v1/check_answer returns the per-claim results. Read-only.
输入模式
{
"type": "object",
"properties": {
"answer": {
"type": "string",
"description": "The full answer text to fact-check. Each factual sentence is checked separately.",
"minLength": 1,
"examples": [
"Marie Curie won two Nobel Prizes. She was born in Warsaw."
]
}
},
"required": [
"answer"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": [
"payment_required",
"ok"
],
"description": "payment_required: pay the HTTP route with x402 to get the result. ok: result is included."
},
"tool": {
"type": "string",
"description": "Tool name."
},
"payment": {
"type": "object",
"description": "Payment instructions. MCP tools/call does not charge or run the paid work; call the HTTP route with x402.",
"properties": {
"protocol": {
"type": "string",
"description": "Payment protocol, always x402 (v2)."
},
"method": {
"type": "string",
"description": "HTTP method for the paid route."
},
"url": {
"type": "string",
"description": "Paid HTTP route to call."
},
"price": {
"type": "string",
"description": "Price in USD, paid as USDC."
},
"amount": {
"type": "string",
"description": "Price in USDC base units (6 decimals)."
},
"network": {
"type": "string",
"description": "CAIP-2 network id (eip155:8453 = Base mainnet)."
},
"asset": {
"type": "string",
"description": "USDC contract address on Base."
},
"pay_to": {
"type": "string",
"description": "Receiving wallet address."
},
"body": {
"type": "object",
"description": "JSON body to POST (the tool arguments you sent).",
"additionalProperties": true
},
"how": {
"type": "string",
"description": "Step-by-step payment flow."
}
},
"required": [
"protocol",
"method",
"url",
"price",
"network"
]
},
"result": {
"type": "object",
"description": "Paid result: { result_id, mode, claims: [{ text, verdict, confidence, citations[] }], next_actions, receipt }.",
"properties": {
"claims": {
"type": "array",
"items": {
"type": "object",
"properties": {
"claim_id": {
"type": "string"
},
"text": {
"type": "string"
},
"verdict": {
"type": "string"
},
"confidence": {
"type": "number"
},
"citations": {
"type": "array",
"items": {
"type": "object"
}
}
}
}
},
"next_actions": {
"type": "array",
"items": {
"type": "object"
}
}
},
"additionalProperties": true
},
"message": {
"type": "string",
"description": "Human-readable summary."
}
},
"required": [
"status",
"tool",
"message"
],
"additionalProperties": true
}🟢deep_verify(answer)
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.
输入模式
{
"type": "object",
"properties": {
"answer": {
"type": "string",
"description": "The claim or short text to verify (up to three claims are checked).",
"minLength": 1,
"examples": [
"US unemployment was 3.7% in December 2023."
]
}
},
"required": [
"answer"
],
"additionalProperties": false
}输出模式
{
"type": "object",
"properties": {
"status": {
"type": "string",
"enum": [
"payment_required",
"ok"
],
"description": "payment_required: pay the HTTP route with x402 to get the result. ok: result is included."
},
"tool": {
"type": "string",
"description": "Tool name."
},
"payment": {
"type": "object",
"description": "Payment instructions. MCP tools/call does not charge or run the paid work; call the HTTP route with x402.",
"properties": {
"protocol": {
"type": "string",
"description": "Payment protocol, always x402 (v2)."
},
"method": {
"type": "string",
"description": "HTTP method for the paid route."
},
"url": {
"type": "string",
"description": "Paid HTTP route to call."
},
"price": {
"type": "string",
"description": "Price in USD, paid as USDC."
},
"amount": {
"type": "string",
"description": "Price in USDC base units (6 decimals)."
},
"network": {
"type": "string",
"description": "CAIP-2 network id (eip155:8453 = Base mainnet)."
},
"asset": {
"type": "string",
"description": "USDC contract address on Base."
},
"pay_to": {
"type": "string",
"description": "Receiving wallet address."
},
"body": {
"type": "object",
"description": "JSON body to POST (the tool arguments you sent).",
"additionalProperties": true
},
"how": {
"type": "string",
"description": "Step-by-step payment flow."
}
},
"required": [
"protocol",
"method",
"url",
"price",
"network"
]
},
"result": {
"type": "object",
"description": "Paid result: { mode: 'deep', status: 'queued', job_id, receipt }. Poll GET /v1/jobs/{job_id} for { verdict, confidence, contradiction, evidence_for[], evidence_against[], citations[] }.",
"properties": {
"job_id": {
"type": "string"
},
"status": {
"type": "string"
}
},
"additionalProperties": true
},
"message": {
"type": "string",
"description": "Human-readable summary."
}
},
"required": [
"status",
"tool",
"message"
],
"additionalProperties": true
}社区
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