sFUM token
sFUM is the utility token for Fantums Reborn. Fixed supply, anti-bot launch, multi-purpose: duel staking, name changes, marketplace fee discounts, tournament entry, and (proposed) governance.
At-a-glance
| Property | Value |
|---|---|
| Name | Sonic Fantums of Opera Token |
| Symbol | sFUM |
| Supply | 100,000 (fixed, never inflates) |
| Decimals | 18 |
| Chain | Sonic mainnet, chain ID 146 |
| Contract | SFUMS.sol |
| Mintable post-deploy? | No |
Note the supply: 100,000, deliberately 1,000× smaller than the original FOO token's 100M. The smaller circulating count gives cleaner per-unit pricing psychology and lets duel costs be human-readable (you pay 10 sFUM, not 10,000,000 FOO).
What sFUM is used for
| Use case | Cost / mechanic |
|---|---|
| Duel wager | Configurable per duel, capped at MAX_FIGHT_COST_SFUMS = 10,000 |
| Name change | Per-character pricing, capped, paid on every rename |
| Marketplace fee discount | Hold ≥ N sFUM → marketplace fee drops from 7.5% to 1% |
| Tournament entry | Premium brackets gate on sFUM holdings |
| Resurrection insurance premium | A small slice (~5%) of each duel routes into the insurance pool |
| Governance (proposed) | Vote on weekly tournament prize pool size, art bounty allocations |
Supply allocation
| Slice | Amount | Vesting | Purpose |
|---|---|---|---|
| Presale | 5,000 sFUM (5%) | Linear unlock over public mint | Bootstrap LP |
| Initial LP | 35,000 sFUM (35%) | Paired with presale + treasury seed, LP locked | Trading |
| Community treasury | 25,000 sFUM (25%) | DAO-controlled, multisig | Tournament pools, Discord rewards, art bounties |
| Team | 20,000 sFUM (20%) | Timelocked in SFUMSTimelock.sol, 12-month cliff + 24-month linear vest | Dev runway |
| Mint airdrop | 15,000 sFUM (15%) | Per-mint airdrop, capped at MAX_AIRDROP_PER_MINT = 1,000 sFUM | Reward minters |
Total: 100,000 sFUM. None of these slices can mint more.
Anti-bot launch
The token implements one-way trading-on toggles and per-block limits during the launch window:
| Feature | Behaviour |
|---|---|
tradingEnabled flag | One-way. Once flipped on, on forever. |
| Max-tx | Per-transaction cap, only enforced for first N blocks after tradingEnabled flips |
| Max-wallet | Per-wallet cap, only enforced for first N blocks |
| Whitelist | System contracts (MintDrop, Duel, Marketplace, Graveyard) bypass limits so internal transfers don't trip them |
| Blacklist | Sniper-bot known-bad list, one-time-set, removable up to 24 hours post-launch |
The blacklist is intentionally expirable. After 24 hours the owner loses the ability to mark any new address as blacklisted. The list can only shrink after that point, not grow.
Buyback and burn
sFUM has a persistent buyback mechanism. Multiple sources route into a burn schedule:
| Source | Slice routed to burn |
|---|---|
| Mint proceeds | Configurable share of public mint price |
| Duel pots | 5% of every duel pot |
| Marketplace fees | 2.5% of marketplace fees |
| FeeM rebate | 50% of Sonic FeeM rebate income |
This means the more the game gets played, the more sFUM gets bought from market and burned. Active play deflates the supply.
There is no scheduled burn — burns happen as a side effect of activity. No "monthly burn ceremony", just continuous deflation tied to engagement.
Floor sweep (proposed)
Occasional treasury actions to:
- Sweep the lowest-listed Fantum from the Marketplace
- Lock it in a "house" wallet
- Re-rent it back to players as a matchmaking opponent
This reduces sell pressure on the floor while keeping the supply circulating. The treasury never sells the swept Fantum back to market — it stays a house Fantum.
Why not a "rebase" token
We considered (and rejected) elastic-supply / rebase patterns. They are accounting nightmares for marketplaces and indexers. Fixed supply is boring but legible. Boring + legible wins.
What sFUM is NOT
- Not a security (no profit-from-others'-efforts pitch)
- Not a stablecoin
- Not a wrapper for any other asset
- Not bridgeable from the original FOO (FOO and sFUM are unrelated assets on different chains)
If you held FOO on Fantom Opera, you do not automatically receive sFUM. The legacy reward is the NFT, not the token. See How to claim for the OG flow.
See also
- sFUM presale — the bootstrap LP raise
- Marketplace fees — how holding sFUM discounts secondary trades
- Combat system — how sFUM is staked in duels
Last updated: 2026-05-21