> ## Documentation Index
> Fetch the complete documentation index at: https://docs.drpn.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# API changelog

> Contract-version history for the Darpan Facade API.

The generated contract carries `info.x-darpan-contract-version`, decoupled from the product release version. The policy is additive-only: new methods, new optional parameters, and new response fields ship without a bump; breaking changes require a conscious one. See [Contract versioning](/api-reference/json-rpc#contract-versioning).

## Contract version 1

Baseline contract (current; shipped alongside Darpan 2.1.2).

* JSON-RPC 2.0 transport over `POST /rpc/json`; HTTP 200 for every dispatched call.
* Auth channels: HttpOnly `darpan_login_key` cookie plus CSRF token (browser, canonical) and `login_key` header (integration callers and fallback).
* Method surface as documented in the [service catalog](/api-reference/service-catalog).