Switchboard x Starknet

A collection of libraries and examples for interacting with Switchboard on Starknet

Getting Started

To get started, clone the starknet repository.

Switchboard Functions

Switchboard V3 revolves around the concept of a Switchboard Function. Functions are the core building block of Switchboard. They are the unit of work that is performed by the Switchboard network. Functions can be user defined, and can be composed together to create more complex functions. Function calls can be initialized on-chain, or on a schedule.

Switchboard Feeds

Switchboard Data Feeds are powered by Switchboard Functions. You can find the source code (contracts and off-chain logic) for the Switchboard Function that powers the available feeds in the functions repository.

• receiver.cairo - The main entry point for the Switchboard Feed Function. This contract is deployed by the Switchboard, and is responsible for receiving data from the off-chain Switchboard Function, and making it available to other contracts.
• Main.rs - The off-chain Switchboard Function that powers the Switchboard Feed. This function is responsible for fetching data from an external API, and submitting it to the Switchboard Receiver contract.

You can find existing Switchboard Feeds and their ID's for accessing in cairo at app.switchboard.xyz.

You can use this simple price function (which supplies 20+ feeds from top exchanges!) and build custom functionality on top of it

Addresses

Starknet

The following addresses can be used with the Switchboard deployment on Starknet

Mainnet

Account	Address
Switchboard Address	0x0728d32b3d508dbe5989824dd0edb1e03b8a319d561b9ec6507dff245a95c52f
Switchboard Push Address	0x02b5ebc4a7149600ca4890102bdb6b7d6daac2fbb9d9ccd01f7198ca29107ec4
Permissionless Queue ID	0x0000000000000000000000000000000000000000000000000000000000000001

Testnet (Goerli)

Account	Address
Switchboard Address	0x026183fd8df673e4b2a007eec9d70bc38eb8a0df960dd5b0c57a9250ae2e63ac
Switchboard Push Address	0x014d660768cb98256ceb18d821fd02fd1b54b6028679ceca3dbe03389228f285
Permissionless Queue ID	0x0000000000000000000000000000000000000000000000000000000000000001

Using Switchboard

Open src/lib.cairo and write your contract.

The easiest way to use Switchboard on Starknet is to use the following simple interface:

// This will generate ISwitchboardPushDispatcher and ISwitchboardPushDispatcherTrait
#[starknet::interface]
trait ISwitchboardPush<State> {
    fn get_latest_result(self: @State, feed_id: felt252) -> (u128, u64);
}


#[starknet::contract]
mod MyProject {
    #[constructor]
    fn constructor(
        ref self: ContractState,
        switchboard_address: ContractAddress,
    ) {
        ...
    }

    // ETH/USD Feed ID: 0x4554482f555344
    // BTC/USD Feed ID: 0x4254432f555344
    fn read_switchboard_value(
        ref self: ContractState,
        feed_id: felt252,
    ) -> (u128, u64) {
        // mainnet address: 0x02b5ebc4a7149600ca4890102bdb6b7d6daac2fbb9d9ccd01f7198ca29107ec4
        // testnet (goerli) address: 0x014d660768cb98256ceb18d821fd02fd1b54b6028679ceca3dbe03389228f285
        let dispatcher = ISwitchboardPushDispatcher { contract_address: self.switchboard_address.read() };
        let (value, timestamp) = dispatcher.get_latest_result(feed_id);
        (value, timestamp)
    }
}

Troubleshooting

1. File a GitHub Issue
2. Ask a question in Discord #dev-support