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Buying and selling on a tonch curve is two TonConnect transactions away. Both flows happen at tonch.app/token/<address>, where each token has a detail page with a chart and a combined buy/sell panel.

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Buying

  1. Open the token’s detail page from the homepage’s Live launches strip, the Explore page, or directly via /token/<curve_address>.
  2. Click the Buy tab in the trade panel.
  3. Type the TON amount you want to spend. The panel shows a real-time quote: the Jettons you’ll receive (after the 1% curve fee) and the implied price-per-Jetton.
  4. Click Buy. TonConnect prompts you to sign a transaction sent to the curve contract.
  5. Approve in your wallet. The transaction sends TON to the curve, the curve mints Jettons to your wallet via TEP-74 transfer, and the trade is indexed within ~10 seconds.
The TonConnect prompt will show:
  • Destination: the curve contract address (per-token, derivable from the launch).
  • Amount: the TON you typed plus a small gas buffer (~0.15 TON).
  • Payload: an op::buy message body with the TON amount.
After signing, your token balance increases. Refresh the page or wait for the indexer to update — the trade history and your wallet’s holder row appear within a minute.

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Selling

Selling on the curve uses the standard TEP-74 Jetton transfer flow with a transfer_notification payload that the curve recognizes:
  1. From the same token detail page, click the Sell tab.
  2. Type the Jetton amount you want to sell. The panel shows the TON you’ll receive (after the 1% fee).
  3. Click Sell. TonConnect prompts you to sign a TEP-74 Jetton transfer.
  4. Approve. Your Jetton wallet sends Jettons to the curve’s wallet; the curve receives the transfer_notification, computes the TON owed, and sends it back to you.
The TonConnect prompt will show:
  • Destination: your own Jetton wallet (this is how TEP-74 transfers work — you message your own wallet, not the curve directly).
  • Amount: ~0.2 TON for gas (the value here is not the trade size; the Jetton amount is in the payload).
  • Payload: an op::transfer body with the Jetton amount and the curve’s wallet as the destination.
The TON arrives in your wallet a few seconds after the curve processes the sell.

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Reading the chart

The token detail page renders a live bonding curve chart and a current-position marker:
  • Y-axis: TON price per Jetton. As the curve fills, price climbs.
  • X-axis: TON collected (real reserves), from 0 to the 1,000 TON graduation target.
  • Marker: where the curve currently sits.
  • Progress bar: the same data shown as a percentage to graduation.
The shape of the curve is fixed — it’s a hyperbola defined by the initial virtual reserves (virtual_ton = 300 TON, virtual_token = 1.010B). See Bonding curve mechanics for the math.

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What can fail

  • Quote endpoint returns 503. The indexer hasn’t enriched the curve config yet (only happens in the first ~60 seconds after launch). Refresh in a moment.
  • Signing rejected by your wallet. Your wallet checked the destination, amount, or payload and refused. Try again or switch wallets.
  • Trade lands but UI doesn’t update. The indexer is a few seconds behind chain. Refresh after ~30 seconds.
  • TON insufficient for gas. Top up by 0.2 TON and retry.