FIRSTBLOCK

Building one block at a time

Master Polkadot.js API development with hands-on coding challenges, real blockchain interactions, and interactive learning modules.

8
Interactive Lessons
5
Hands-on Challenges

Why Choose FirstBlock?

Interactive learning with real blockchain technology and hands-on coding experience.

Interactive Code Editor

Real-time Polkadot.js API development with Monaco Editor and live Westend testnet connection

Hands-on Challenges

Progressive coding challenges with validation, real-time feedback, and solution guides

Real Blockchain Data

Connect to Westend testnet for authentic blockchain interactions and data queries

Modular Learning

Structured curriculum from basics to advanced concepts with practical examples

Course Modules

Progressive learning path from fundamentals to advanced Polkadot.js API development.

Intro to Polkadot.js API

Connect to chains, query state, and understand the basics

8 lessons2-3 hoursBeginner

Submitting Extrinsics

Create transactions, track status, and handle errors

Coming Soon

Storage & Constants

Read storage, work with constants, and decode data

Coming Soon

Advanced APIs

Staking, governance, identity, and complex interactions

Coming Soon

Rust State Machine

Build a Polkadot SDK-like state machine from scratch in Rust

Coming Soon

Ready to Build Your First Block?

Start your journey into Polkadot.js API development with hands-on coding challenges and real blockchain interactions.