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The dev-buy is an optional first buy that happens right after a launch. The deployer specifies a TON amount on the launch form; that amount is automatically routed through the curve as the first transaction after the curve goes live. There is no separate “pre-mint” or “creator allocation”. The dev-buy is a standard buy on the standard curve. The deployer pays the same 1% curve fee as every subsequent buyer.

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Why dev-buy exists

Two reasons:
  1. Skin in the game. A deployer who isn’t willing to put any of their own TON into the curve sends a weak signal to traders. The dev-buy lets the deployer commit publicly without any special privilege.
  2. Initial price floor. A token with zero buys at the start has the curve’s lowest possible price. Some deployers prefer to set an immediate floor by being the first buyer.
Neither reason is required. Many tokens launch without a dev-buy, and that’s fine — the curve still works.

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How it actually executes

Right now the dev-buy is a second TonConnect signature after the launch transaction lands:
  1. The first signature deploys the Jetton + curve.
  2. The frontend waits for the curve to be active on chain (~30 seconds).
  3. If a dev-buy size was specified, the frontend prompts a second signature for the buy.
Both signatures come from the same wallet in the same session. The flow is automatic — you don’t have to navigate anywhere between them.

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Pricing — no preferential treatment

The dev-buy executes against the same curve state as any other first-buy. Specifically:
  • The curve starts with virtual_ton = 300, virtual_token = 1.010B, real_ton = 0, real_token = 800M.
  • The dev-buy of size T TON moves the price using the same constant-product formula as everyone else: tokens_out = (virtual_token * T_net) / (virtual_ton + T_net), where T_net = T * 0.99 (after the 1% fee).
  • The dev-buy pays the same 1% curve fee.
  • The fee accrues to the curve’s accumulated fees, claimable by the deployer after graduation via op::sweep_fees.
There is no early-buyer discount, no fee waiver, no Jetton bonus.

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Sizing your dev-buy

The dev-buy is denominated in TON. As a sanity check:
  • A 1 TON dev-buy buys roughly 1 * 1.010B / (300 + 1) ≈ 3.36M Jettons, or about 0.34% of the for-sale supply.
  • A 10 TON dev-buy buys roughly 10 * 1.010B / (300 + 10) ≈ 32.6M Jettons, or about 4.07% of the for-sale supply.
  • A 100 TON dev-buy buys roughly 100 * 1.010B / 400 ≈ 252.5M Jettons, or about 31.6% of the for-sale supply — large enough that it noticeably moves the curve’s price.
These are pre-fee approximations. The actual fill is computed on-chain at execution time using the exact curve math.

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What the dev-buy is not

  • Not a vesting commitment. The Jettons land in your wallet immediately. You can sell them back to the curve at any time, just like any other holder.
  • Not a separate price tier. Everyone gets the same per-Jetton price the curve quotes them at the moment they buy.
  • Not refundable. The 1% fee on the dev-buy goes into the curve’s accumulated fees and is paid out at graduation along with all other accumulated curve fees.
If you want to acquire a substantial position without moving the price, the dev-buy is the worst way to do it (you’ll move the price up against yourself). The dev-buy is for committing publicly in a small amount, not for accumulating quietly.