How Parity works

Parity launches one coin on two chains at once: a pump.fun coin on Solana and a Flap tax token on BNB Chain. Both have a fixed supply of one billion, so if their prices match, their market caps match. Parity's job is to keep them matched.

It does that with the fees the coin already generates. pump.fun pays a creator fee on every curve trade, and Flap tax tokens take a configurable tax on every buy and sell. Both flow to wallets Parity controls. A keeper process watches the two market caps and, whenever one falls outside a band around the other, spends that chain's accrued fees buying the cheaper side back up.

You need one wallet: a Solana wallet such as Phantom. The BNB side is created by Parity's own wallet. The flow from the Launch page:

1. 1
   Fill in the token

   Name, ticker, description, image and optional links. The same metadata is used on both chains.
2. 2
   Choose a dev buy

   An optional SOL amount you pay from your own wallet. There is no BNB dev buy: the Parity wallet only ever pays the BNB creation gas, never a position.
3. 3
   Set the band

   How far apart the two market caps may drift before the keeper steps in (default ±3%). Fees are fixed: 1% on both chains.
4. 4
   Sign once

   The server builds a pump.fun create_v2 transaction, pre-signed by the new mint, and your wallet signs it as payer. The server broadcasts it.
5. 5
   BNB follows automatically

   Once Solana confirms, the server calls Flap's Portal.newTokenV6 from the Parity wallet, creating the tax token at a vanity address ending in 7777.

If the BNB step fails after Solana succeeded, the row shows as partial and the BNB side can be retried from the server without touching Solana again.

Each chain has its own expectations for metadata, so the image is pinned twice.

Images are capped at 5 MB and must be PNG, JPEG, WebP or GIF. Square images around 512px render best across both ecosystems.

Solana: pump.fun creator fees

Every pump.fun coin has a creator key fixed at mint time. Parity sets a 1% creator fee on every coin (pump.fun allows up to 3%), which accrues to a vault derived from that key, one vault for every coin the key created. Parity sets the creator to its Solana keeper wallet, so fees from every launch land in one vault. Only the keeper can sweep it, and it does so before each buy when the vault holds more than PARITY_MIN_SWEEP_SOL.

BNB: Flap tax

Flap tax tokens charge buyTaxRate and sellTaxRate in basis points; Parity sets both to 1%. It also sets mktBps to 10,000, so after Flap's protocol cut the whole tax goes to the beneficiary, which is the Parity BNB wallet. On the bonding curve the tax is collected in BNB and forwarded immediately. After graduation it is collected in the token itself, liquidated by Flap's tax processor once a threshold is reached, and paid out in BNB. Flap's trigger bot calls dispatch(), so nothing on Parity's side needs to claim anything.

pnpm parity runs a loop that walks every live pair every PARITY_INTERVAL_MS (30 seconds by default). One tick does this for each pair:

1. 1
   Read both sides

   On the curve, price comes straight from the on-chain curve state. After graduation it comes from Birdeye. SOL and BNB in USD come from Birdeye as well.
2. 2
   Compute the gap

   gap = (higher − lower) / higher, in basis points. A snapshot is written for the charts.
3. 3
   Decide

   If the gap is inside the pair's band, do nothing. Otherwise the lower side is the lagging side.
4. 4
   Fund

   On Solana, sweep the creator vault if it is worth a transaction. On BNB the fees are already in the wallet.
5. 5
   Size

   Work out exactly how much native token lifts the lagging price to the other side's price (next section). Cap it by what is spendable above the gas reserve and by the per-tick maximum.
6. 6
   Buy

   Execute on the bonding curve, or on Jupiter and PancakeSwap after graduation. Log the action with the transaction hash.
7. 7
   Burn

   Burn the tokens just bought: on Solana from the Token-2022 account, on BNB by sending them to the dead address. Flap tokens can't be moved for an hour after a buy, so anything still held is retried every tick. Logged as its own action.

Both bonding curves have closed forms, so the keeper can compute the exact spend rather than nudging and re-checking.

pump.fun

The curve is constant product on virtual reserves. With virtual SOL reserve v and virtual token reserve t, price is v / t and k = v · t is constant. To reach target price p*:

The spend is Δv grossed up by about 1.5% for protocol and creator fees.

Flap

Flap's curve is (x + h)(y + r) = K, which gives price = (r + reserve)² / k. To reach p*:

The spend is Δreserve grossed up by the 1% curve fee plus the token's buy tax, because on the curve the tax is taken from the input.

After graduation

On a DEX the pool depth is read from Birdeye liquidity. Treating the pool as constant product with quote-side depth L / 2, the quote needed to move price from p to p* is approximately:

The keeper then buys through Jupiter on Solana and the PancakeSwap V2 router on BNB, using the fee-on-transfer swap so the tax does not revert the trade.

Both tokens start on a bonding curve and graduate to a DEX pool once enough supply is sold. Parity handles both phases and the transition.

The two sides do not graduate at the same moment. Between the first and second graduation the keeper keeps working; the only thing that changes is which venue and price source it uses on each side.

Parity holds two wallets. Their addresses are shown on the Launch page and printed when the keeper starts.

Neither wallet needs to be pre-funded with trading budget. The budget is the fees. If a side lags and the matching wallet has nothing to spend, the keeper logs a skip and tries again next tick.

Everything is set in the environment. Band is per pair and chosen at launch; the rest applies to the keeper globally.

• One direction only. The keeper lifts the lower side and burns what it buys. It cannot pull the higher side down, so a sharp pump on one chain is matched only as fast as fees allow.
• Fees are the ceiling. A pair with little volume earns little, and the keeper can only spend what has been earned on that chain.
• Pooled per chain. Fees from all pairs on a chain sit in one wallet and are spent on whichever pair lags most. Attribution per pair is not enforced yet.
• Oracles. Native prices and post-graduation token prices come from Birdeye. A stale or missing quote makes the keeper skip that tick rather than guess.
• Slippage. Curve buys use the contract quote minus 3%. DEX buys use the router quote minus 3% minus tax. A revert is logged as an error, not retried in the same tick.
• Keys on a server. Both keeper wallets are hot wallets. Keep only what the loop needs in them.

Flap launches use newTokenV6 with TOKEN_TAXED_V3, an 80% DEX threshold and the V2 migrator. The older V2 tax token is disabled on Flap mainnet. pump.fun launches use create_v2 (Token-2022) via @pump-fun/pump-sdk.