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com.jpyc-service/ec-storefront

REMOTE · EC.JPYC-SERVICE.COM · SCANNED SEP 21

JPYC (JPY stablecoin) EC platform MCP: product search, x402 gasless checkout, order status.

0 this week 78 Trust /100
Trust breakdown (7 categories)

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →

Endpoint Security63
Transport & Reachability100
Schema Quality & AI Usability68
  • AI-judged instruction clarity (excellent).Pass
  • Context-footprint check failed: tool/resource definitions use about 1798 tokens (~199/item across 9 items; 9 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
  • Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
  • No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
  • 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
  • 100% of tool parameters carry a description.Pass
Tool Safety75
  • No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
  • 0 of 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation; "authorize_transfer" implies "transfer" and declares no destructiveHint at all, which the MCP spec reads as destructive by default. See how to fix → Fail
  • An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
  • Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Install

How do I install the com.jpyc-service/ec-storefront MCP server?

com.jpyc-service/ec-storefront is a hosted endpoint at https://ec.jpyc-service.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

remote · ec.jpyc-service.com

# add to Claude Code
claude mcp add --transport http com-jpyc-service-ec-storefront 'https://ec.jpyc-service.com/mcp'
// .cursor/mcp.json
{
  "mcpServers": {
    "com-jpyc-service-ec-storefront": {
      "url": "https://ec.jpyc-service.com/mcp"
    }
  }
}
// .vscode/mcp.json
{
  "servers": {
    "com-jpyc-service-ec-storefront": {
      "type": "http",
      "url": "https://ec.jpyc-service.com/mcp"
    }
  }
}
# ~/.codex/config.toml
[mcp_servers.com-jpyc-service-ec-storefront]
url = "https://ec.jpyc-service.com/mcp"
// opencode.json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-jpyc-service-ec-storefront": {
      "type": "remote",
      "url": "https://ec.jpyc-service.com/mcp",
      "enabled": true
    }
  }
}
# add to OpenClaw
openclaw mcp add com-jpyc-service-ec-storefront --url 'https://ec.jpyc-service.com/mcp' --transport streamable-http
# ~/.hermes/config.yaml
mcp_servers:
  com-jpyc-service-ec-storefront:
    url: "https://ec.jpyc-service.com/mcp"
// ~/.netclaw/config/netclaw.json
{
  "McpServers": {
    "com-jpyc-service-ec-storefront": {
      "Transport": "http",
      "Url": "https://ec.jpyc-service.com/mcp"
    }
  }
}
# add to Vellum
assistant mcp add com-jpyc-service-ec-storefront -t streamable-http -u 'https://ec.jpyc-service.com/mcp'
// mcp.json
{
  "mcpServers": {
    "com-jpyc-service-ec-storefront": {
      "type": "http",
      "url": "https://ec.jpyc-service.com/mcp"
    }
  }
}

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

Changelog

Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.

  • 20 Sept 26 0
    • Tool “quote_checkout” rewrote its description, which is the text the model reads security
    • Tool “submit_payment” rewrote its description, which is the text the model reads security
    • “quote_checkout” added an optional parameter “demo_signature_version” cosmetic
  • 19 Sept 26 0
    • “quote_checkout” added an optional parameter “coupon_code” cosmetic
    • “quote_checkout” added an optional parameter “idempotency_key” cosmetic

    2 cosmetic changes on this day. Switch on “Show cosmetic changes” to see them.

  • 13 Sept 26 −3
    • Tool “quote_checkout” rewrote its description, which is the text the model reads security
    • Tool “submit_payment” rewrote its description, which is the text the model reads security
    • Schema quality: 140 → 179 functional
    • Destructive annotations: pass → 0 functional
    • New tool “authorize_transfer” functional
    • “quote_checkout” added an optional parameter “payer_address” cosmetic
  • 26 Aug 26 +1
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 25 Aug 26 0
    • Stability: 0.97 → pass security
  • 24 Aug 26 +1

    No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.

  • 11 Aug 26 0
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
  • 31 Jul 26 0
    • We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
Diagnostics

Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.

Captured 21 Sept 2026 · Probed https://ec.jpyc-service.com/mcp

TLS valid

Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .

Subject Issuer Valid from Valid until Key Signature Serial
CN=ec.jpyc-service.com CN=YR2,O=Let's Encrypt,C=US 14 Sept 2026 13 Dec 2026 RSA 2048 SHA256-RSA 59cbd3cb9b8928834356d71d39eaebf7b59
SANs: ec.jpyc-service.com
CN=YR2,O=Let's Encrypt,C=US (CA) CN=Root YR,O=ISRG,C=US 3 Sept 2025 2 Sept 2028 RSA 2048 SHA256-RSA 4ebd24947e24d394802d84a52fd5b319
CN=Root YR,O=ISRG,C=US (CA) CN=ISRG Root X1,O=Internet Security Research Group,C=US 13 May 2026 2 Sept 2032 RSA 4096 SHA256-RSA f24b6d17f9d9ad7cb1c9fea78782699f

Background: What to check on a remote MCP endpoint →

DNSSEC insecure

Validation of ec.jpyc-service.com. Not signed

Zone DS Keys Algorithms Outcome
. trust_anchor 20326, 38696 8, 8 Verified
com. present 19718 13 Verified
jpyc-service.com. absent Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation
Authentication No authorisation required

The endpoint answered without asking for a token. Anyone who knows the URL can reach it.

Result No authorisation required
HTTP status 200
Header Value
strict-transport-security max-age=63072000; includeSubDomains
content-security-policy default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' 'wasm-unsafe-eval' https://platform.twitter.com; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob: https:; font-src 'self' data:; connect-src 'self' https: wss:; frame-src 'self' https:; worker-src 'self' blob:; object-src 'none'; base-uri 'self'; form-action 'self'; frame-ancestors 'self' https://dev.jpyc-service.com https://admin-ec.jpyc-service.com
x-content-type-options nosniff
referrer-policy strict-origin-when-cross-origin
permissions-policy camera=(), microphone=(), geolocation=()

Background: How OAuth 2.1 works in the 2026 MCP spec →

Transports 2 probes
Transport URL Outcome Status Location
streamable-http https://ec.jpyc-service.com/mcp Verified 200
http (plaintext) http://ec.jpyc-service.com/mcp HTTPS enforced 308 https://ec.jpyc-service.com/mcp
MCP tools · 9 exposed · ~1,798 tokens

The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →

Tool Tokens
authorize_transfer ~161

erc20-transfer 方式だけで、JPYC を送金する前に必ず呼ぶ。quote_checkout の選択した accept にある extra.payerAuthorization.message をウォレットで personal_sign し、その署名と reservation_id を渡す。サーバは EOA / ERC-1271 / ERC-6492 を検証して予約へ固定する。このツール自体は送金も approve も行わない。成功を確認してから accepted.amount ぴったりを transfer すること。eip3009 方式では呼ばない。

NameTypeReqDescription
reservation_idstringyesquote_checkout が返した reservation_id
signaturestringyespayerAuthorization.message の personal_sign 署名

No output schema declared.

No examples provided.

get_order_status ~77

ウォレットアドレスの注文履歴を新しい順で返す。x402 で購入した注文は即時に order_status=3(決済完了)となり tx_hash を持つ。

NameTypeReqDescription
customer_addressstringyes顧客のウォレットアドレス(0x...)

No output schema declared.

No examples provided.

get_product ~99

1 つの商品の詳細を product_id で取得する。価格(JPYC 建て)・在庫・SKU・バリエーション・配送要否・対応チェーンを返す。購入の前に必ず呼んで、requires_shipping(配送先が必要か)と has_variants(オプション選択が必要か)を確認すること。

NameTypeReqDescription
product_idstringyes商品 ID

No output schema declared.

No examples provided.

get_shop ~80

1 つのショップ(生産者・職人)の詳細を slug で取得する。ショップのストーリーや説明、対応ブロックチェーン、x402 決済が有効かどうかを返す。

NameTypeReqDescription
shop_slugstringyesショップの slug(URL 識別子)

No output schema declared.

No examples provided.

list_products_in_shop ~89

1 つのショップの公開中の商品をすべて返す。価格(JPYC 建て)・在庫・バリエーション・配送要否・対応チェーンを含む。list_shops でショップを見つけたあと、その品揃えを見るのに使う。

NameTypeReqDescription
shop_slugstringyesショップの slug

No output schema declared.

No examples provided.

list_shops ~94

JPYC EC Platform に出店している公開ショップの一覧を返す。減農薬の農産物・地酒・伝統工芸品など、生産者から直接買えるショップが中心。各ショップの name / slug / 説明 / 対応チェーン / 商品点数を含む。商品を探す起点として最初に呼ぶとよい。

Input schema present but exposes no named parameters.

No output schema declared.

No examples provided.

quote_checkout ~645

カートの内容で x402 チェックアウトの 1 回目を実行する。在庫を仮押さえし(有効期限は返り値 expires_at_unix_ms)、小計・割引・送料・合計(JPYC)と reservation_id、および PAYMENT-REQUIRED チャレンジ(base64url、x402 accepts 配列)を返す。accepts の決済方式: 『eip3009』(既定。通常購入の EOA ウォレットはこちらを選び、EIP-712 TransferWithAuthorization に署名する) と『erc20-transfer』(ecrecover 非対応のスマートコントラクトウォレット専用。payer_address を渡した予約にだけ提示される。extra.payerAuthorization.message を personal_sign して authorize_transfer を呼び、その成功後に表示額ぴったりの通常 ERC-20 transfer を実行し、txHash 任意/payerAddress 必須で submit_payment に渡す)。0円デモは demo_signature_version=1 と payer_address を渡すと demo-signature を提示する。送金せず personal_sign だけで完了する。全 item は同一ショップである必要がある。配送が必要な商品があれば shipping を、贈答なら gift_recipient を必ず渡すこと。

NameTypeReqDescription
coupon_codestringショップから受け取ったクーポンコード(任意。NFT割引との併用不可)
customer_emailstringyes注文確認メールの送信先(必須)
customer_notestring注文メモ
demo_signature_versionstring0円デモのpersonal_signに対応する場合のみ指定
gift_recipientobject贈り先(is_gift が true なら必須)
idempotency_keystring同じ見積もりの再試行で必ず再利用する一意キー。クーポン利用時は必須(UUID推奨)。異なる購入内容に同じキーを使わないこと
is_giftboolean贈答かどうか
itemsarrayyes購入する商品
payer_addressstring支払いに使うウォレットアドレス(任意・推奨)。指定すると settle 時に支払い元と照合され、別ウォレットからの支払いは拒否される。スマートコントラクトウォレットで erc20-transfer 方式を使う場合は必須(指定が無いと accepts に erc20-transfer が提示されない)
preferred_chain_idinteger希望チェーン(任意。商品の対応チェーンから選ばれる)
shippingobject配送先(配送が必要な商品がある場合は必須)
shop_idstringyesショップ ID(全 item 共通)

No output schema declared.

No examples provided.

search_products ~246

JPYC EC Platform 上の公開商品を横断検索する。減農薬米・地酒・伝統工芸品など、生産者から直接 JPYC で購入できる商品が対象。text は自然言語のキーワード(例: 『丹波 米』)で、商品名と説明に部分一致する。category / tag(産地・認証種別など)、価格帯(min_price / max_price、JPYC)、shop_slug で絞り込める。売上順で最大 50 件返す。

NameTypeReqDescription
categorystring商品カテゴリーの完全一致
limitinteger最大件数(1-50、既定 20)
max_pricenumber最高価格(JPYC)
min_pricenumber最低価格(JPYC)
shop_slugstring特定ショップに絞り込む
tagstring商品タグ(産地・認証種別など)の完全一致
textstring自然言語のキーワード(商品名・説明に部分一致)

No output schema declared.

No examples provided.

submit_payment ~307

quote_checkout で得た reservation_id と、エージェントが用意した x402 PaymentPayload(base64url)を渡して決済を確定する。demo-signatureならextra.payerAuthorization.messageをpersonal_signし、{payerAddress,demoSignature}を渡す。送金やauthorize_transferは呼ばない。quote_checkout の accepts から選んだ方式に応じて payload の中身が変わる: 『eip3009』なら { signature, authorization } (EIP-712 TransferWithAuthorization の署名)、『erc20-transfer』なら { payerAddress, txHash? } (ウォレットが実行した通常の ERC-20 transferの送金元アドレス。txHash は分かれば渡す任意ヒント — 無くてもサーバがon-chain のログを検索して照合する)。erc20-transfer は送金前に必ず authorize_transfer を成功させる。eip3009 はサーバが facilitator 経由で on-chain settle し、erc20-transfer はユーザーが既に送金したものをサーバが検証するだけ。いずれも確定した注文(order_number / tx_hash)を返す。

NameTypeReqDescription
payment_signaturestringyes署名済み x402 PaymentPayload(base64url JSON)
reservation_idstringyesquote_checkout が返した reservation_id

No output schema declared.

No examples provided.

Common questions

What is the com.jpyc-service/ec-storefront MCP server?

com.jpyc-service/ec-storefront is an MCP server listed in the public MCP registry as com.jpyc-service/ec-storefront. JPYC (JPY stablecoin) EC platform MCP: product search, x402 gasless checkout, order status. This page covers its hosted endpoint (https://ec.jpyc-service.com/mcp).

Is the com.jpyc-service/ec-storefront MCP server safe to use?

com.jpyc-service/ec-storefront scores 78 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

What tools does the com.jpyc-service/ec-storefront MCP server expose?

com.jpyc-service/ec-storefront exposes 9 tools: list_shops, get_shop, list_products_in_shop, get_product, search_products, and 4 more. Their descriptions and schemas cost roughly 1,798 tokens of context every time the server is loaded.

Does the com.jpyc-service/ec-storefront MCP server require authentication?

No. We connected to com.jpyc-service/ec-storefront without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

Is the com.jpyc-service/ec-storefront MCP server still maintained?

com.jpyc-service/ec-storefront is still listed as active in the MCP registry. We last reached this channel on 21 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.