From Fantom to Sonic: The Complete Guide to Swapping FTM for S

The crypto world does not sit still. Technology that felt advanced in 2020 now struggles to keep up with today’s demand for low fees and high speed.

Fantom (FTM), once marketed as a high-speed “Ethereum killer,” has now moved into its next phase: Sonic (S).

This is not only a fresh name or a new ticker. Sonic represents a deep technical redesign of the network that targets “state bloat,” a problem that affects many older blockchains.

If you hold FTM, this upgrade requires a token migration. Whether your coins sit on an exchange or in a self-custody wallet, you need to know how to move them to the new chain.

Why Did Fantom Become Sonic?

To understand the migration, it helps to see what Sonic is trying to fix.

As blockchains grow, they store huge amounts of historical data. Every transaction, no matter how small, must be recorded and kept. Over time, that can create serious storage bloat.

On many networks, running a validator node, the computers that secure the chain, starts to require expensive hardware with large storage. When only well-funded operators can afford to run nodes, the network risks becoming more centralized and less resilient.

The Solution: Validator Pruning

Sonic tackles this storage issue with a process called validator pruning.

In simple terms, pruning lets a node discard older data that it no longer needs in order to verify new transactions.

Instead of storing every transaction ever made, a Sonic validator focuses on the current “world state” (who owns what right now) plus a recent slice of blocks.

This pruning happens in real time. The node stays relatively light and fast while it processes new activity.

The result is a network that is cheaper to run and is designed to handle more than 10,000 transactions per second.

The Migration: Token Swap Details

The move from FTM to S is a standard token swap where the protocol replaces the old asset with a new one.

• The ratio: The swap happens at a 1:1 ratio. For every 1 FTM you hold, you receive 1 S.
• The ticker: The new token symbol is S.
• The timeline: The migration started in late 2024. Two-way bridging (back and forth between FTM and S) ended on March 18, 2025. Since then, the migration is one-way only. You can convert FTM to S, but not convert S back to FTM.
• Current status: As of February 2026, the official swap portal is still live for holders who have not yet migrated their FTM.

How to Convert FTM to Sonic

Your migration path depends on where you currently hold your FTM.

1. For Users on Centralized Exchanges

If you held FTM on a major centralized exchange (CEX) during the migration window, the swap was likely handled for you.

Most large exchanges paused FTM deposits and withdrawals, took a snapshot of user balances, then credited accounts with the same amount of S once the upgrade went through.

Check your account history or balances to confirm your assets now show as S instead of FTM.

If your account still shows FTM, or if your exchange never supported the migration, you may need to withdraw your FTM to a self-custody wallet and complete the swap yourself through the official portal.

2. For Users with Hot Wallets (Self-Custody)

If you hold FTM in a wallet like MetaMask, Trust Wallet, Phantom, or another self-custody wallet, you are responsible for running the swap.

Step-by-step guide:

1. Find the official portal
   Go to the official Sonic Labs migration portal.
   Always confirm the URL through Sonic’s official documentation or verified social media. Avoid clicking random links from search ads or private messages.

2. Connect your wallet
   Click the connect button and choose your wallet provider.
   Make sure your wallet is set to the Fantom Opera network before you proceed.

3. Approve the transaction
   Your wallet will ask you to sign an approval transaction.
   This gives the migration smart contract permission to access the FTM tokens you want to convert.

4. Swap your tokens
   Enter how much FTM you want to convert, then click the upgrade or swap button.
   You will need to sign another transaction to finalize the swap, and you must have a small amount of FTM in your wallet to cover gas fees.

5. Add the Sonic network
   Once the swap is complete, your FTM balance will go down and your S balance will go up.
   To see S in your wallet, you may need to manually add the Sonic network and token details in your wallet settings.

How It Works in Practice: The Execution Client

The Sonic upgrade changes how the network processes transactions at a deep level.

In the old Fantom setup, the execution client, the software that runs smart contracts, could become a choke point when the network got busy. This often led to slower confirmations or higher fees during peak activity.

Sonic brings in a new execution environment that is built to process many transactions in parallel.

For someone using a decentralized exchange (DEX), a lending protocol, or any DeFi app, this is meant to result in faster confirmations and a smoother experience, even when on-chain activity spikes.

By migrating to S, you move your assets from an older execution engine to a newer system that separates long-term storage from daily transaction processing.

Risks and Red Flags

Token migrations are a prime time for scammers, because they know users are searching for links, portals, and instructions.

Watch for the following:

• Fake migration portals
  Scammers often buy search or social media ads that point to fake migration sites.
  These can look nearly identical to the real portal, but once you connect your wallet, they attempt to drain your funds. Always double-check URLs through official Sonic channels.

• Unsolicited support messages
  No legitimate support team will DM you first on X (Twitter), Discord, Telegram, or any other platform to “help” you migrate.
  Treat any unexpected message about your FTM or Sonic migration as a likely scam.

• Suspicious approvals
  Review every permission your wallet asks you to sign.
  If a site requests unlimited access to your stablecoins or other tokens that are not part of the migration, cancel the transaction immediately and disconnect your wallet.

The Future of Sonic

The shift to Sonic is more than a new name. It is a strategic attempt to keep the network competitive in a crowded field of high-speed chains.

By addressing state bloat and lowering the cost of running a validator, Sonic is positioning itself as a home for high-performance DeFi and other intensive on-chain applications.

For now, your main job as a user is simple. Make sure your FTM is safely converted to S through the official process.

Once you migrate, your tokens participate in a faster, pruned network that is built to handle the next wave of on-chain activity.