PandaStrategy Token (panda_strategy_token)

Pure-ledger PANDASTR with transfer tax (default 15%, owner up to 25%) and a built-in DIESEL ↔ PANDASTR AMM.

Any wallet, site, or bot can call SwapBuy / SwapSell — no authorized swap contract.

SellPanda lets users attach Alkane Pandas (2:614) and receive DIESEL at the owner-set price. The contract converts accumulated fee PANDASTR through the internal AMM at sell time (no pre-funded vault).

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Opcodes

Op	Name	Notes
0	Initialize	owner, fee_bps, pool_panda, founder, name, symbol + optional seed DIESEL
1	Transfer	signed; fee on amount
2	SwapBuy	attach DIESEL → PANDASTR ledger (permissionless)
3	SwapSell	signed; PANDASTR → DIESEL out (permissionless)
4	SellPanda	attach Panda 2:614 → DIESEL out (converts /fee_p on the fly)
6	SetPaused	owner
7	SetFeeBps	owner
8	SetPandaPrice	owner — DIESEL per Panda (0 = buyback off)
9	WithdrawFees	owner — /fee_p → owner ledger

Views

Op	Returns
20	GetBalance(pk)
21	GetPoolPanda
22	GetFeeState — fee_bal(16) ‖ fee_bps(4)
23	GetPoolState — diesel(16) ‖ panda(16)
24	GetBuybackState — price(16) ‖ fee_p(16) ‖ panda_bought(16) ‖ pool_d(16) ‖ pool_p(16)
25	GetPandaPrice — diesel per Panda (u128)
26	GetAdminNonce — owner nonce (u64)
101–103	name, symbol, total supply

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Initialize calldata

Offset	Field
0	owner (32 B)
32	fee_bps (4) — 1500 = 15%
36	pool_pandrastr (16) — AMM inventory (ledger)
52	founder_amount (16) — credit owner ledger
68+	name, symbol

Attach optional seed DIESEL 2:0 in the same tx for initial pool_diesel.

Panda buyback price starts at 0 (disabled) until owner calls SetPandaPrice.

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AMM

x = pool_diesel (attached alkanes on this contract)
y = pool_pandrastr (ledger)
out = (y × Δx) / (x + Δx)

15% tax applies on the PANDASTR leg (buy and sell), same as Transfer.

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SellPanda (opcode 4) — convert on sell

Calldata: min_diesel(16)
Attach: one or more Alkane Panda 2:614 (amount = count; typically 1 per NFT).

Flow:

1. diesel_pay = panda_count × /panda_price
2. Contract sells enough PANDASTR from /fee_p through the AMM (no second tax) to free ≥ diesel_pay DIESEL from /pool_d
3. User receives diesel_pay DIESEL; Pandas stay on the contract UTXO
4. Fails if /fee_p too low, pool too thin, or price is 0

Example: price = 100000000 (1 DIESEL in 8-decimal base units), attach 1 Panda → user gets 1 DIESEL if fees + pool can support conversion.

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SetPandaPrice (opcode 8)

Calldata: owner(32) ‖ sig(64) ‖ nonce(8) ‖ price_u128(16)

Domain PSTR_PANDAPRICE, action = price(16).

Set 0 to disable buyback.

Read / update price (scripts)

# Read current price (DIESEL base units)
TOKEN=2:N node get-panda-price.mjs
TOKEN=2:N FULL=1 node get-panda-price.mjs   # + full buyback state

# Owner update price (1 DIESEL = 100000000 base units if 8 decimals)
MNEMONIC="..." TOKEN=2:N PANDA_PRICE_DIESEL=100000000 CONFIRM=yes node set-panda-price.mjs

# Disable buyback
MNEMONIC="..." TOKEN=2:N PANDA_PRICE_DIESEL=0 CONFIRM=yes node set-panda-price.mjs

On-chain views: opcode 25 GetPandaPrice, opcode 8 SetPandaPrice (owner-signed).

SwapBuy (opcode 2)

Calldata: min_pandrastr_out(16) ‖ buyer_pk(32)
Attach: DIESEL to token contract.

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SwapSell (opcode 3)

Calldata: user_pk(32) ‖ amount(16) ‖ min_diesel(16) ‖ nonce(8) ‖ sig(64)

Domain PSTR_SWAPSELL, action = amount(16) ‖ min_diesel(16), per-user nonce /u/{pk}.

Outgoing: DIESEL to tx pointer.

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Transfer signature

Domain PSTR_TRANSFER, action = to(32) ‖ amount(16), per-user nonce /u/{pk}.

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Deploy

cd contracts/panda_strategy_token
cargo build --release --target wasm32-unknown-unknown

MNEMONIC="..." FEE_BPS=1500 POOL_PANDA=... FOUNDER=... \
  TOKEN_NAME="Panda Strategy" TOKEN_SYMBOL=PANDASTR \
  CONFIRM=yes node deploy-token.mjs

After deploy: SetPandaPrice to enable NFT buyback (e.g. 1 DIESEL per Panda in base units).

Attach seed DIESEL in the Initialize reveal tx (protostone edict).