Quickstart

Open the IDE and sign in with Google, GitHub, or Discord. Your testnet wallet is created and funded automatically, check the wallet widget in the top bar to see its G… address and XLM balance.

Open the project menu, choose New project, and pick the Counter template. You get a single-file crate:

#![no_std]
use soroban_sdk::{contract, contractimpl, symbol_short, Env};

#[contract]
pub struct CounterContract;

#[contractimpl]
impl CounterContract {
    pub fn increment(env: Env) -> i32 {
        let key = symbol_short!("counter");
        let current: i32 = env.storage().instance().get(&key).unwrap_or(0);
        let new_value = current + 1;
        env.storage().instance().set(&key, &new_value);
        new_value
    }

    pub fn get(env: Env) -> i32 {
        let key = symbol_short!("counter");
        env.storage().instance().get(&key).unwrap_or(0)
    }
}

Click Deploy. WebSoroban compiles the crate to Wasm, then uploads and instantiates it, signing the transaction with your wallet. When it finishes, the console prints the contract id:

Compiled. WASM ready.
Deploying to Stellar testnet…
Contract deployed · CDLZFC3SYJYDZT7K67VZ75HPJVIEUVNIXF47ZG2FB2RMQQVU2HHGCYSC

The deploy is signed by your testnet wallet and recorded on the project. You don't pick a network, it's always testnet.

Open the Invoke panel (the contract console on the right). Select increment. It takes no arguments. Because it changes state, it's a write: click Invoke & sign. The return value is the new count:

1

Select get and click Run (simulate). Reads don't sign or submit anything, they simulate and return immediately:

1

Run increment again and get returns 2. That's the full loop.