Trade a meme

Every meme trades against USDC in a constant-product pool inside its own contract. There is no external DEX. Prices, fees and the mNAV rules all live in the same contract.

On testnet the USDC is usdc.solidon.testnet, a mock token with 6 decimals and no value. Get 1,000 of it with Get test funds (see Quickstart).

BuyCopy Anchor Link

Open a meme from Markets. The trade panel has a Buy tab and a Sell tab (and Redeem while the redemption window is open).

The button says exactly what happens: Buy ~… SYMBOL for 10 USDC. If something blocks the trade, the button says why instead: "Enter an amount", "Not enough USDC", "Amount too small".

After you confirm, a toast shows "Buying SYMBOL", then "Bought SYMBOL" with a link The transaction on NearBlocks. If you run out of USDC, the panel shows "Out of USDC? It is free on testnet." with a Get test funds button.

What the buy transaction containsCopy Anchor Link

A buy is one call on the USDC token, not on the meme:

{
  "receiver_id": "honey.solidon.testnet",
  "amount": "10000000",
  "msg": "{\"action\":\"buy\",\"min_out\":\"<minimum tokens, 18 decimals>\"}"
}

The USDC contract calls the meme's ft_on_transfer. The meme then:

1. Splits the 1% fee: 0.8% to treasury cash, 0.2% credited to the creator as claimable USDC.
2. Swaps the rest through the pool (x * y = k).
3. Refuses with "Slippage: output below min_out" if the output is below min_out. Any refusal refunds the full USDC through the token standard.
4. Sends the tokens to you and logs a buy event.

With your own wallet, the first buy of a meme also calls storage_deposit on the meme (0.00125 NEAR) so you can hold its token. The wallet asks twice. The demo wallet signs both without popups.

SellCopy Anchor Link

On the Sell tab, enter an amount in "You sell" (or MAX). The panel shows "You get ≈ … USDC", with the same Details rows.

The button reads Sell … SYMBOL for ~… USDC. It calls sell(amount, min_out) on the meme with 1 yoctoNEAR attached. The contract:

1. Swaps your tokens through the pool.
2. Takes the same 1% fee from the USDC out (0.8% treasury, 0.2% creator).
3. Refuses if the net USDC is below min_out.
4. Sends you the USDC with ft_transfer.

The success toast says "Sold SYMBOL. USDC is on its way; if the transfer fails it becomes claimable." Claimable USDC appears in the trade panel as "… USDC waiting for you" with a Claim … USDC button, which calls claim_usdc.

Pay from another chainCopy Anchor Link

Under the Buy tab, Pay from another chain opens a NEAR Intents 1Click quote: any asset 1Click routes into USDC on NEAR, the asset a Solidon buy is paid in.

• Common assets are listed first: SOL, ETH on Base, ETH on Arbitrum, BTC, and USDC on Base, Solana and Arbitrum. Search all assets lists the rest.
• Enter an amount in "You send". About 500 ms after you stop typing, the app requests a quote and shows "You get ≈ … USDC on NEAR".
• Details show Minimum received, Route cost, Arrives in and To.

On a mainnet build, the same panel offers Get a … deposit address, an optional refund address, and then follows the swap: "Waiting for your deposit", "Deposit seen, waiting for confirmations", "Swapping into USDC on NEAR", "Done: the USDC is in your NEAR account".

Where the fees goCopy Anchor Link

See How it works for how treasury cash becomes stock on Base, Robinhood Chain and Solana.