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Substrate to EVM Fungible token transfer

Transferring assets from Substrate-based chains to EVM-based chains can be achieved using the Sygma SDK. To facilitate the transfer, the following steps are required:

  1. Specify transfer parameters such as amount, recipient address, token, destination chain and use the method createSubstrateFungibleAssetTransfer from @buildwithsygma/substrate to create an instance of SubstrateFungibleAssetTransfer
  2. Sign and send the transfer transaction using polkadot.js

1. Create and initialize the transfer object​

To initialize the asset transfer object, the following parameters need to be supplied:

  • An instance of the PolkadotJS ApiPromise object
  • Environment variable SYGMA_ENV needs to be set as mainnet or testnet
const fungibleTokenTransfer = await createSubstrateFungibleAssetTransfer({
  source: 5232, // Phala
  destination: 1, // Ethereum Mainnet
  sourceNetworkProvider: apiPromise,
  sourceAddress: "<substrate_address>",
  resource:
    "0x0000000000000000000000000000000000000000000000000000000000000001", // PHA resource ID more resources can be found here: https://github.com/sygmaprotocol/sygma-shared-configuration/blob/main/mainnet/shared-config-mainnet.json
  amount: BigInt(1) * BigInt(1e12),
  destinationAddress: "<evm_recipient_address>",
});

2. Sign and send transfer transaction​

const tx = await fungibleTokenTransfer.getTransferTransaction();
await transferTx.signAndSend(account, (results) => {
  const { status } = results;
  console.log(`Current status is ${status.toString()}`);
});

A full example of the above can be found here