SVM Transactions

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Intro

• When a user needs to transfer or swap from an SVM chain (e.g. Solana), the Skip Go API will return an SvmTx type for the developer to pass to the user for signing
• This doc is intended for CosmosSDK and EVM developers who aren’t already familiar with the concepts of transaction construction in the SVM and need to use SvmTx to help their users move from/to Solana and other SVM chains.
• Due to the difficult nature of including Solana transactions on chain during times of high network congestion, we HIGHLY recommend using the /submit endpoint to avoid dealing with complex retry logic and/or multiple RPC providers for submission reliability. Skip Go API’s /submit endpoint implements best practices for Solana transactions submission for you!

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Interact with Solana Wallets

We recommend using @solana/wallet-adapter to interact with Solana wallets and build transactions. It provides a standardized Adapter object that wraps all major Solana wallets (e.g. Phantom, Backpack, etc…), as well as visual React components for wallet selection. See here for all the supported wallets.

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Set up the SkipClient to use a Solana wallet

All you need to do is initialize the getSVMSigner method in SkipClient.options to extract the @solana/wallet-adapter-base from the user’s connected wallet of choice:

import { useWallet } from "@solana/wallet-adapter-react";
import { PhantomWalletName } from "@solana/wallet-adapter-phantom"
import { SkipClient } from '@skip-go/client';

const { wallets } = useWallet();

const skipClient = new SkipClient({
  getSVMSigner: async (chainID) => {
		const { svm } = trackWallet.get();
		const solanaWallet = wallets.find((w) => w.adapter.name === PhantomWalletName);
    return solanaWallet
  }
});

After this point, you can use route, executeRoute, and the other methods of SkipClient as you normally would.

The rest of these docs cover the underlying details of the data structures, in case you need them.

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Understand SvmTx Data Structure

The SvmTx has 2 fields that the developer needs to understand:

• chain_id: The ID of the chain that this transaction should be submitted to
• tx: This is the base64 encoded bytes of the transaction you should have the end user sign.

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Info on SvmTx.tx

This is a fully constructed transaction. You don’t need to change it or add anything to it to prepare it for signing. You just need to sign it and have the user submit it on chain within about 1 minute (or the nonce will expire).

For more detail, the transaction already includes:

• User’s nonce (In Solana, this is actually a recent blockhash by default)
• Instructions (Solana’s equivalent to messages)
• Base transaction fees (Set to the default of 500 lamports per signature)
• Priority fees (More info on how we set these below)

For more information on transactions, check out the Solana’s official docs

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Signing tx

Skip Go Client takes care of all of the complexity of signing the transaction that gets returned in SvmTx.tx.

You just need to have set the getSVMSigner method in the SkipClientOptions object in the SkipClient constructor then use executeRoute or executeTxs.

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How Priority Fees are Set

Solana “priority fees” affect how likely it is a transaction gets included in a block. Unlike for many other major blockchain networks, Solana’s priority fees are evaluated “locally”. In other words, the size of the fee is compared to other transactions that access the same pieces of state (e.g. the same DEX pool, the same token contract etc…):

• If the fee is low relative to other transactions that access the same state, the transaction is unlikely to get included.
• If its high relative to these other transactions accessing similar state, its likely to be included

As a result, transactions that touch “congested” or “popular” state will be the most expensive.

At this time, we are setting priority fees to match the 90% percentile of priority fees for the “wif” pool state on Jupiter, which we believe is highly congested state. This is a very conservative setting, but it even with these “high amounts”, fees are still fractions of a cent.