NFT strategy¶
A token that sweeps one collection's floor. Once it graduates from its curve, every trade feeds a treasury, the treasury buys the cheapest pieces, and every piece it sells burns the token.
Like every strategy, an NFT strategy starts on its own bonding curve and graduates into its pool at 4.2 ETH (The curve). Everything below is what happens after graduation: before it, there is no treasury and no bid.
Every second since the last purchase, the machine offers a little more.
A listing at or under the bid is bought, and the piece is checked on arrival.
It goes on the shelf at 1.2 times what the machine paid.
What it sells for buys the token back and sends it to the dead address.
The bid¶
The machine cannot read a marketplace listing, so it never guesses what a piece is worth. It publishes a bid instead, and raises it every second since its last purchase until someone finds it worth taking.
The bid is the smallest of 3 numbers:
- the climb: seconds since the last purchase, times the bid growth set at launch
- the ceiling: the most the strategy will ever pay for 1 piece
- the treasury: what it actually holds
The climb starts from zero when the pool opens, and again after each purchase. Bid growth is set between about 0.0036 ETH and 36 ETH an hour. Too slow, and the bid never reaches the floor; too fast, and it runs past the floor before a seller can react.
Filling the bid¶
Anyone who finds a piece listed at or under the bid can have the machine buy it: usually a seller who wants the ETH, or Sweep's keeper. They point the machine at the listing, the machine pays, and then it checks what it got.
- One more piece arrived. A venue that takes the ETH and sends nothing is refused.
- It is the piece that was paid for. A venue that sends a cheaper piece from the same collection is refused.
- It did not come from the collection itself. A collection cannot create fresh pieces and sell them to its own strategy at the bid. Every purchase comes from a seller on the market.
- The cost is what actually left the treasury. A venue that returns change is credited for it.
If any check fails, the whole purchase is undone and the treasury is untouched.
The shelf¶
A piece goes on the shelf the moment it arrives, at 1.2 times what the machine paid. Anyone can buy it at exactly that price, and the piece goes straight to their wallet. There is no marketplace in between and no listing to sign.
Sweep can change the markup, and a change moves every piece on the shelf at once. The shelf price never goes below what the machine paid, so a sale is never a loss for the treasury.
The contract can also lower a price slowly over time, from the markup back to cost. That is switched off, on purpose: the machine buys at the floor, so a price falling toward cost would end up under the floor, and the strategy would undercut the collection's own sellers.
The burn¶
What a piece sells for never returns to the treasury. It waits in a separate queue, so sales cannot quietly turn the machine into a fund.
The queue drains in passes of at most 1 ETH, at least 12 seconds apart. Whoever runs a pass keeps 0.5% of it; Sweep's keeper runs one as soon as 0.001 ETH is waiting. The rest buys the token on its own pool and sends it to the dead address.
That buy pays the fee like any other trade. 9 of every 10 tokens it buys are burnt, and the 10th becomes fees, 8 points of which feed the treasury again.
A real collection¶
Chain Mancers is one of the largest collections on Robinhood Chain: 5,000 hooded pixel mancers, with every pixel stored in the contract itself. It has no Sweep strategy. The walk-through below shows what one would do, with the collection's real floor and a real piece.
| Chain Mancers | |
|---|---|
| Contract | 0x797a2e030B7e49107C8F07bF0300Ea9caE88cA57 |
| Pieces | 5,000 |
| Holders | 886 |
| Floor | 0.5089 ETH |
Chain Mancers, 14 September 2026
- Say the wallet the Chain Mancers contract names as its owner launches $MNCSTR, with the form's bid growth of 1 ETH an hour. The strategy carries the verified badge, and that wallet receives the royalty.
- $MNCSTR trades on its curve until buyers have put 4.2 ETH into it, then graduates into its pool. Nothing is bought before that.
- The floor is 0.5089 ETH, so the treasury needs that much before it can buy. At 8 points of every trade in the pool, that is about 6.4 ETH of $MNCSTR trading after graduation.
- About 31 minutes after the pool opens, the bid reaches 0.5089 ETH. A seller has Chain Mancer #100 listed at the floor and points the machine at the listing. The machine pays 0.5089 ETH and checks that #100 arrived.
- Chain Mancer #100 goes on the shelf at 0.61068 ETH.
- The floor climbs past 0.61068 ETH. A collector buys #100 from the shelf, and the 0.61068 ETH join the burn queue.
- Under 1 ETH, the queue drains in a single pass. Whoever runs it keeps 0.0030534 ETH. The other 0.6076266 ETH buy $MNCSTR on its pool, and 9 of every 10 tokens bought go to the dead address.
Launching one¶
Anyone can launch an NFT strategy, on any collection. When the launcher is the collection's own owner — read from the collection contract itself — the strategy carries a verified badge, recorded at the launch block and never recomputed. Every other launch works identically and carries no badge.
The royalty goes to whoever launched, from the first trade on the curve, and cannot be moved afterwards by anyone, including the collection's owner. A collection can carry any number of strategies: they bid against each other on the same floor, and the badge is what tells the collection's own apart. See Launching a strategy.
When it goes quiet¶
The floor falls under the shelf price. Pieces wait on the shelf and nothing burns. Sweep can lower the markup so they sell again.
The ceiling is under the floor. The treasury fills behind a bid that can never reach a listing. Sweep can raise the ceiling, by at most double once every 7 days.
It never graduates. A strategy whose curve never reaches 4.2 ETH never has a treasury, and never buys a piece.
The collection stops trading. The machine keeps bidding with whatever its token earns. It cannot create demand for a collection nobody wants.