Cheapest eSIM Korea — travel eSIM price MCP server (최저가e심)

Verified daily prices of travel eSIMs and physical SIMs sold to Korean travelers, for 54 destination countries and 1–30 day trips — as a free, no-auth remote MCP server and a public JSON API.

• MCP endpoint (Streamable HTTP): https://pyungyo.com/esim/mcp
• Public API: https://pyungyo.com/esim/api/v1 · OpenAPI 3.1
• Website: https://pyungyo.com/esim · Docs: https://pyungyo.com/esim/developers
• Auth: none · Cost: free · Data license: CC BY 4.0

Every result ends with a citation line, e.g. 출처: 최저가e심(pyungyo.com/esim), 2026-10-15 기준, so assistants can attribute the source and as-of date.

Tools

All tools are read-only (readOnlyHint: true).

Tool	What it does	Inputs
find_esim_prices	Sellers and the cheapest price for a country and trip length	country (e.g. japan or 일본), days 1–30, type unlimited/daily/total, gb, form esim/usim, limit
compare_countries	Countries ranked by cheapest unlimited eSIM for the same trip length	days, form, limit
get_price_trend	Recent daily cheapest-price history and "is today cheap?" judgement (no forecasting)	country, days (1, 3, 5, 7, 10, 15, 30), form
get_seller_profile	How often a seller changed prices, sold-out ratio, cells where it is cheapest today	seller
list_countries	Supported countries	—

Example

"What's the cheapest 5-day unlimited eSIM for Japan?"

find_esim_prices {"country": "japan", "days": 5} →

일본 eSIM 5일 무제한: 화면 최저가 10,000원 (나무커머스, 판매처 N곳 비교)
1. 도시락이심 12,560원 · 리뷰 136,166 · …
…
출처: 최저가e심(pyungyo.com/esim), 2026-10-15 기준 · 매일 20:00 KST 수집·검증 · https://pyungyo.com/esim

structuredContent carries the full JSON (sellers, prices, reviews, options, product URLs, as-of time, license, citation).

Connect

• Claude: Settings → Connectors → Add custom connector → URL https://pyungyo.com/esim/mcp
• ChatGPT: Settings → Apps & Connectors → Advanced (developer mode) → Create → MCP server URL https://pyungyo.com/esim/mcp, no authentication
• Any MCP client (remote/Streamable HTTP):

{
  "mcpServers": {
    "cheapest-esim": { "type": "http", "url": "https://pyungyo.com/esim/mcp" }
  }
}

How the data is made

• Every day at 20:00 KST, option-level prices of travel eSIM/SIM products on Naver SmartStore are collected from each seller's product API.
• Only data that passes automatic verification (live re-check of a sample, integrity checks, screen-text audit) is published; failed runs keep the previous day's data.
• Unlimited lists include only data-only, no-throttling options; call plans, slow-after-cap, 1+1 bundles and sold-out options are excluded. SIM prices include shipping.
• "Cheapest" (pagePrice) follows the same rule as the website: sellers with ≥1,000 reviews (filled up to 5 sellers by review count when fewer), bundles excluded, the cheapest single option per seller.
• No recommendation scores and no paid placement: sellers are ordered by review count.

Limits

120 requests/min per IP for the API, 300/min for MCP. For bulk use, download the daily CSV: https://pyungyo.com/esim/data/esim-price-trends.csv

License & citation

Data: CC BY 4.0 — cite as 최저가e심(pyungyo.com/esim), <as-of date>. Prices change daily; always include the date. Purchases happen on the seller's store; we are not affiliated with any seller.

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한국어 안내

해외여행 eSIM·실물 유심 판매처(네이버 스마트스토어) 가격을 매일 20:00(KST)에 수집·검증해 54개국·1~30일로 비교한 데이터를 MCP 서버와 공개 API로 무료 제공합니다.

• MCP 주소: https://pyungyo.com/esim/mcp (인증 없음, 읽기 전용 도구 5개)
• 공개 API: https://pyungyo.com/esim/api/v1
• 안내: https://pyungyo.com/esim/developers
• 인용: "최저가e심(pyungyo.com/esim), 기준일" (CC BY 4.0)

운영: 케이코인(KCOIN) · 문의 [email protected]