Skip to content
eSIM SOS logo

eSIM SOS MCP server

Which MCP servers are eSIM SOS's own, from the official registry and from asking its own domain, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-27

← Back to eSIM SOS

Whose server it is
  • Registry namenet.esimsos/esimsosverified in the MCP registry

The registry name sits under esimsos.net. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-27
  • Stateanswerschecked 2026-10-27
  • Tools6
  • Server calls itselfesimsos
  • Server version1.0.0
  • Protocol version2025-06-18

On 2026-10-27 the server answered initialize and tools/list without a sign-in. First answer in 157 ms.

Should an agent connect itNot proven either way yet
  • Whether its tools do the product's job has not been judged yet.
  • Checked on 2 of the 7 days it takes to judge reliability.

Once connected

  • create_order change data without a sign-in: anyone with the address can call them.

Said by rules from the measurements above. The likely first call is a model's pick from the tool list; read its description before relying on it.

Measured dailydaily checks: 2, the first on 2026-10-27
  • INITE MCP scoreafter a weeka score needs 7 daily checks: 2 so far
  • Answeredmeasuring2 of the 7 daily checks it takes to print a share
  • Median first answer653 ms
  • Space in an agent's context≈ 785 tokensthe definitions of all its tools (6), which an agent carries on every turn
  • Tool definitionsA · 100 of 100
  • Typed results0 of 6 toolsdeclared outputSchema: results come typed, read once
  • Every tool passes all six checks.

Worth a look

  • Tools that change data, on a server that answers without a sign-in: create_order

A program checks the server once a day: initialize and tools/list, no model. Tokens are the definitions' length at about four characters a token. The grade averages six checks of every tool's name, description, schema and annotations; it says how well the tools are described, not whether they work. The score weighs what was measured and nothing else: answering (25%), doing the product's job (25%), definitions (20%), context (10%), use (10%) and how readily a client connects (10%). A part that was not measured is left out, and a hidden instruction caps the score at 40. The state of vendors' MCP servers: method and numbers →

Tools it offers6 tools · read 2026-10-27
  • search_destinations

    Find a travel destination (country) sold by eSIM SOS by name in English or Russian, or by ISO code. Returns country codes for list_plans.

  • list_plans

    List eSIM data plans for a country with final prices in RUB (one price for every payment method). Local plans first, then regional ones.

  • compare_prices

    Compare eSIM prices of several providers for a country and data size using the open esimdar.com dataset (CC BY 4.0). Disclosure: esimdar.com is owned and run by eSIM SOS, the shop behind this server; eSIM SOS is listed as an ordinary row…

  • create_order

    Create an unpaid eSIM order and get a payment link. Payment is always done by the human: give the user the payment link, never try to pay yourself and never ask for card details. Ask the user for their email first: the eSIM QR code is…

  • order_status

    Check the payment and delivery status of an order. Requires both order_id and the email used for the order.

  • install_instructions

    After payment: link to the order page with the QR code and step-by-step eSIM install instructions for iPhone and Android. Requires order_id and email.

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "esimsos": {
      "type": "http",
      "url": "https://esimsos.net/api/mcp"
    }
  }
}

Add it

Claude Code, in a terminal

claude mcp add --transport http esimsos https://esimsos.net/api/mcp

Add to CursorAdd to VS Code

claude.ai, ChatGPT and other clients: add https://esimsos.net/api/mcp as a custom connector in the settings.

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.