Lumen Pre-Sign Check
Use before signing an EVM tx or EIP-712 message: risk flags + verdict. Informational, no simulation
使うべきか
品質と安全性
ツール定義とプロトコルへの準拠に関する自動分析に基づいています。
コンテキストコスト
これは、サーバーのツールがモデルのコンテキストに読み込まれるたびに消費されるおおよそのトークン数です。数が多いほど、ほかのタスクに使える注意が減ります。
インストール
ワンクリックインストール
これを `claude_desktop_config.json` ファイルに追加してください:
{
"mcpServers": {
"lumen-presign-check": {
"url": "https://lumenworks-x402-decoder.onrender.com/mcp/presign"
}
}
}リモートエンドポイント
https://lumenworks-x402-decoder.onrender.com/mcp/presignstreamable-httpできること
ツール一覧
ツール（2）
🟢explain_before_sign(transaction, calldata, typedData, chainId, expected_pay_to)
Lumen Pre-Sign Check. Use before signing any EVM transaction or EIP-712 message: returns {summary, flags[], verdict} with verdict looks_ok | review | do_not_sign_unless_intended. Flags unlimited approve/increaseAllowance, EIP-2612 Permit and Permit2 (typed data and on-chain), setApprovalForAll, unknown spender, admin calls (upgradeTo/transferOwnership), zero-price Seaport orders, long deadlines, chain mismatch and x402 payTo mismatch; decodes multicall/aggregate3 inner calls one level. Example: USDC approve(spender, 2^256-1) -> do_not_sign_unless_intended, UNLIMITED_APPROVAL. Agent policy: abort on do_not_sign_unless_intended, escalate review. Informational, not a security guarantee; looks_ok does not mean safe; no simulation. $0.002, no signup, free tier 20/h; not charged if the call errors.
入力スキーマ
{
"type": "object",
"properties": {
"transaction": {
"type": "object",
"description": "Unsigned EVM transaction",
"properties": {
"to": {
"type": "string",
"description": "Target contract/address (0x…)"
},
"data": {
"type": "string",
"description": "Calldata hex (0x…)"
},
"value": {
"type": "string",
"description": "Native value in wei (decimal string)"
}
},
"required": [
"data"
]
},
"calldata": {
"type": "string",
"description": "Shortcut: calldata hex when you have no tx object"
},
"typedData": {
"type": "object",
"description": "EIP-712 typed data {domain, types, primaryType, message} (Permit, Permit2, EIP-3009, Seaport…)"
},
"chainId": {
"type": "number",
"description": "Chain the wallet is on; used for chain-mismatch checks"
},
"expected_pay_to": {
"type": "string",
"description": "For x402/EIP-3009 payments: the payTo you expect; mismatch is flagged"
}
},
"anyOf": [
{
"required": [
"transaction"
]
},
{
"required": [
"calldata"
]
},
{
"required": [
"typedData"
]
}
]
}🟢x402_payment_safety_check(url, method, payment_required, expected_pay_to, expected_network, ...)
FREE, deterministic pre-payment check for an x402 endpoint. Give {url} (we fetch its unpaid 402) and/or {payment_required} (402 JSON or base64 header), plus optional expected_pay_to, expected_network, max_price_usdc, listed_price_usdc, facilitator_url, client_config {max_per_call_usdc, max_daily_usdc, idempotency_key, allow_any_pay_to}. Returns verdict ok/review/do_not_pay with checks: HTTPS/health, payTo validity & mismatch, unknown asset/network, price sanity vs cap/listing, timeout/replay window, multiple payTo, unknown facilitator, missing spend caps/idempotency. Nothing is stored; inputs that look like private keys are rejected.
入力スキーマ
{
"type": "object",
"properties": {
"url": {
"type": "string"
},
"method": {
"type": "string",
"enum": [
"POST",
"GET"
]
},
"payment_required": {},
"expected_pay_to": {
"type": "string"
},
"expected_network": {
"type": "string"
},
"max_price_usdc": {
"type": "number"
},
"listed_price_usdc": {
"type": "number"
},
"facilitator_url": {
"type": "string"
},
"client_config": {
"type": "object"
}
}
}コミュニティ
エビデンス