---
title: "DualLine developer resources — OpenAPI, JSON and MCP"
description: "Use DualLine’s public read-only OpenAPI, JSON and MCP resources for canonical pricing and bilingual product guidance."
canonical: "https://dualline.co/developers"
---

# Read DualLine’s published information at the source.

Public, read-only JSON, OpenAPI and MCP surfaces for pricing, product limits and connection guidance. They expose no account data, purchases, number reservations or live eSIM inventory.

## What are these interfaces for?

They help answer questions about DualLine with current canonical sources. No authentication is required because the interfaces do not expose private data or operations that change anything.

## Public endpoints

[/pricing.json](https://dualline.co/pricing.json)

Second-line reference prices, billing periods, purchase channels and cancellation rules.

[/knowledge.json](https://dualline.co/knowledge.json)

Full English and Turkish guides, an index of every public page, questions, answers and canonical source links.

[/openapi.json](https://dualline.co/openapi.json)

The OpenAPI 3.1.1 contract describing both public JSON endpoints.

/mcp

The same published information through get\_pricing, list\_guides and get\_guide MCP tools.

## Shortest path to a response

1. Read pricing GET https://dualline.co/pricing.json
2. Fetch the guide catalogue GET https://dualline.co/knowledge.json
3. Import the schema https://dualline.co/openapi.json
4. Connect an MCP client https://dualline.co/mcp

## Contract boundaries

- Read-only: no endpoint purchases, reserves, activates or changes an account.
- Account-free: no user account, phone number, message, activation credential or payment data is exposed.
- Source-linked: answers point to visible DualLine pages and review dates.
- Honest scope: travel eSIM prices and inventory depend on the selected package and are shown at checkout, not quoted here.

[Open the OpenAPI document](https://dualline.co/openapi.json) [Open the guide catalogue](https://dualline.co/knowledge.json)