CodeTrain / Developers

CodeTrain developer API

A public, read-only HTTP API over the CodeTrain course catalog, changelog and roadmap. No account, no key, no signup. Base URL https://api.codetrain.ai.

Quickstart

$ curl -s https://api.codetrain.ai/v1/catalog

That is the whole setup. Every endpoint below is a GET, returns JSON, and needs no credentials. If you would rather read prose than JSON, every page on this site also serves markdown: ask for it with Accept: text/markdown.

$ curl -s -H "Accept: text/markdown" https://codetrain.ai/learn/

Endpoints

Each endpoint in full

GET /v1/health

Liveness and the current API version.

$ curl -s https://api.codetrain.ai/v1/health
{"status": "ok", "version": "v1"}

GET /v1/catalog

Every published course, its classes and their lessons.

$ curl -s https://api.codetrain.ai/v1/catalog
{"courses": [{"id": "python-intro", "title": "...", "classes": [...]}]}

GET /v1/courses/{course_id}

One course with its live classes.

$ curl -s https://api.codetrain.ai/v1/courses/python-intro
{"id": "python-intro", "title": "...", "classes": [...]}

GET /v1/lessons/{lesson_id}

Metadata for one curated lesson: title, blurb, language and step count. Never the step content, because writing the steps is what the learner is here to do.

$ curl -s https://api.codetrain.ai/v1/lessons/python-basics
{"id": "python-basics", "title": "...", "lang": "python", "steps": 4}

GET /v1/changelog

What shipped, newest first. The same entries as /changelog/.

$ curl -s https://api.codetrain.ai/v1/changelog
{"entries": [{"id": "open-skill-sync-2026-10-13", "date": "2026-10-13", "kind": "feature"}]}

GET /v1/roadmap

Roadmap items grouped by stage. The same data as /roadmap/.

$ curl -s https://api.codetrain.ai/v1/roadmap
{"stages": [{"key": "shipped", "label": "Shipped", "items": [...]}]}

GET /v1/referrals/{code}

Whether a Conductor Network referral code belongs to somebody. A bare boolean and nothing else: no name, no id.

$ curl -s https://api.codetrain.ai/v1/referrals/ada
{"valid": true}

Authentication

The /v1 endpoints listed above need none. Everything they return is already published as a web page on this domain, so putting a key in front of it would protect nothing and stop an agent reading it.

CodeTrain does have an authenticated API behind the dashboard and the CLI, and it is not part of this public contract. It is versioned separately, changes without notice, and is not documented here on purpose: it is an implementation detail of our own clients rather than an integration surface. If you need something from it, write to support@codetrain.ai and tell us the job you are trying to do, and we will either add it to /v1 or explain why not.

Rate limits

Read endpoints allow 120 requests per minute per IP address, and how much of that you get depends on what kind of client you are. The referral lookup allows 60 per hour per IP address whoever is asking, because it answers a question about real people to a stranger.

Every response carries the current state of your budget, so a client can slow down before it is refused rather than after:

Versioning and deprecation

• The major version is in the path. /v1 is the only version today.
• Additive changes ship without a version bump. New endpoints and new fields on an existing response can appear at any time, so parse defensively and ignore what you do not recognise.
• Nothing is removed or renamed inside a version. A breaking change means /v2, and /v1 keeps working.
• When an endpoint is on its way out it answers with a Deprecation header and a Sunset header giving the date it stops. The gap is at least 90 days, and the same notice goes in the changelog.
• Errors are JSON with a detail string and a real HTTP status. A missing course or lesson is a 404, never a 200 with an empty body.

Which CodeTrain is which?

CodeTrain is one product with one account, and there are two ways in today: the website at codetrain.ai and the CodeTrain CLI on your own machine. CodeTrain Open Skill is a separate, free tool that needs no account.

Command line

The CodeTrain CLI runs the tutor locally and serves its own interface on 127.0.0.1. Install it either way round:

$ pip install codetrain-cli
$ curl -fsSL https://codetrain.ai/install.sh | sh

Both put the CodeTrain CLI in the same place and install the same launcher, so it does not matter which you pick, and using both does no harm. It keeps itself current: once a day it checks whether the published bundle changed and replaces its own copy if it did. There is nothing to reinstall to get a newer CodeTrain CLI.

Four commands need no account at all, which makes them safe for a script to call before anything is set up:

$ codetrain doctor      # is the service up, is this install healthy. --json, exit 0 or 1
$ codetrain version     # installed agent bundle against the published one
$ codetrain catalog     # the curated courses
$ codetrain update      # fetch the newest bundle now

The installer checks the bundle against a published SHA-256 before it unpacks anything. The bundle and its checksum are at /dist/codetrain-agent.tar.gz. The CLI needs Python and nothing else, and it talks to https://api.codetrain.ai by default.

It keeps itself current. Once a day it checks whether the published bundle has changed, and replaces its own copy if it has, verifying the checksum the same way the installer does. To force it, run codetrain update. To switch it off, set CODETRAIN_NO_UPDATE=1 and update by hand.

Machine-readable

• OpenAPI 3.1 document for the public API.
• Interactive reference, generated from the same document.
• /llms.txt, which says when to reach for CodeTrain and links every page in markdown.
• /llms-full.txt, the whole public site as one markdown file.
• /sitemap.xml for the canonical URL list.