EVM

Learn how to build and use programs that call Switchboard data feeds on EVM chains like Ethereum, Monad, and Hyperliquid.

If you need to create a custom data feed, check out the custom feeds section.

If you are integrating a Feed Builder feed or any bytes32 feed ID from the explorer on EVM, use the v2 feed-hash flow:

1. Fetch the definition with /v2/fetch/{feedId}

2. Simulate with /v2/simulate/{feedHashes} or CrossbarClient.simulateFeed(...)

3. Build the on-chain payload with /v2/update/{feedHashes}?chain=evm&network=mainnet|testnet&use_timestamp=true

The legacy /simulate/evm and /updates/evm routes are only for older aggregator-based integrations.

Monad Example Network Switch

The packaged Monad examples in sb-on-demand-examples/evm now share one network selector:

• NETWORK=monad-testnet

• NETWORK=monad-mainnet

RPC_URL remains optional as an override, but the example scripts now verify that it matches the selected network before they broadcast transactions. The Monad guides under this section use that shared env contract.

Deployments

The Switchboard contract has been deployed to the following EVM networks:

Chain	Network	Chain ID	Address
Arbitrum	Mainnet	42161	0xAd9b8604b6B97187CDe9E826cDeB7033C8C37198
Arbitrum	Sepolia	421614	0xA2a0425fA3C5669d384f4e6c8068dfCf64485b3b
Core	Mainnet	1116	0x33A5066f65f66161bEb3f827A3e40fce7d7A2e6C
Core	Testnet	1114	0x2f833D73bA1086F3E5CDE9e9a695783984636A76
HyperEVM	Mainnet	999	0xcDb299Cb902D1E39F83F54c7725f54eDDa7F3347
Monad	Mainnet	143	0xB7F03eee7B9F56347e32cC71DaD65B303D5a0E67
Monad	Testnet	10143	0x6724818814927e057a693f4e3A172b6cC1eA690C
Morph	Mainnet	-	0x33A5066f65f66161bEb3f827A3e40fce7d7A2e6C
Morph	Holesky	-	0x3c1604DF82FDc873D289a47c6bb07AFA21f299e5