Buying and Selling a Token on prjx with Rabby

prjx pairs well with Rabby because it lets you swap across chains from one screen, while Rabby shows what you are about to approve or sign before your crypto moves.

prjx, also branded as Project X, is a multi-chain DEX. You can use it for normal token swaps on one chain, or for cross-chain swaps where the token starts on one chain and arrives on another.

In this walkthrough, we’ll use Rabby Wallet to swap USDC on Base into HYPE on HyperEVM. That example is useful because it shows why prjx is handy for Hyperliquid users: you can move from a common chain like Base or Arbitrum into the HyperEVM side without hopping between several apps.

Quick takeaway: On prjx, Rabby connects like a normal browser wallet, handles EVM chain switches, and previews approvals, spender contracts, balance changes, and risk warnings before you sign.

Open prjx with Rabby installed

  • Open your Rabby Wallet browser extension.
    • Use the official site, rabby.io, if you still need to install it.
    • Make sure your wallet is unlocked.
    • Go to prjx.com in the same browser.
    • Click “Connect Wallet” on prjx.
    • Choose Rabby if it appears. If the wallet picker shows MetaMask or Browser Wallet instead, that can still work because Rabby supports the same injected wallet standard.

prjx uses a wallet login flow through Privy, so the connect screen may look a little different from older DEX apps. The important part is the same: you are giving the site permission to view your wallet address. You are not moving funds yet.

Check the URL before connecting

  • Use the official prjx app URL.
    • The app is https://www.prjx.com.
    • The research also found https://prjx.fi serving the same app.
    • Do not connect your wallet to lookalike domains such as prjx.io, prjx.org, or random “Project X” sites.

This step is boring, but it matters. Fake DEX sites are common. A scam site can look almost identical to the real one and still ask your wallet to approve a dangerous transaction.

Choose the right chain

  • Select the chain your funds are already on.
    • For this example, we’ll start with USDC on Base.
    • You can also use other EVM chains that prjx supports through its routing partners, such as Ethereum, Arbitrum, Optimism, Polygon, BNB Chain, and Avalanche.
    • If prjx needs Rabby to switch chains, Rabby will show a chain switch confirmation.
    • If you reject the chain switch, the swap will not continue.

Rabby is helpful here because you do not need to manually paste RPC details for every EVM chain. If prjx requests Base, Arbitrum, or HyperEVM, Rabby can show the chain switch prompt and let you approve or reject it.

If Rabby switches chains after you choose a token in prjx, your wallet is not broken. It is matching the chain prjx needs for that route.

Select the token you want to buy

  • Use the token selectors in prjx.
    • In the “From” field, choose USDC on Base.
    • In the “To” field, choose HYPE on HyperEVM.
    • Type the token name or ticker into the search box if you do not see it right away.
    • Check the chain name beside the token. USDC on Base is not the same thing as USDC on Ethereum or USDC on Arbitrum.

This matters because token names and logos are easy to copy. The contract address is what tells you whether you are trading the real asset or a fake version with the same name.

Enter the amount you want to swap

  • Type the amount of USDC you want to swap.
    • For a first test, use a small amount instead of your full balance.
    • Keep a little ETH on Base for gas.
    • Review the estimated HYPE you will receive.
    • Check the price impact, minimum received, network cost, and estimated time.
    • prjx may show its own fee as free, but you still pay network gas and any bridge or liquidity fees built into the route.

For a same-chain swap, the quote may complete in seconds. For a cross-chain swap, prjx has to route through a bridge, so the timing is longer. L2-to-L2 routes can be around 30 seconds to a few minutes. Ethereum mainnet routes can take longer because the source chain itself is slower and more expensive.

Adjust slippage only if you understand the tradeoff

  • Open the settings or gear icon if you need to change slippage.
    • Lower slippage can protect you from a worse fill, but it can also make the transaction fail.
    • Higher slippage can help volatile swaps go through, but it can also give you a bad price.
    • For stablecoin pairs, low slippage usually makes sense.
    • For volatile tokens like HYPE, do not set slippage high just to force the trade through.

If the market moves past your slippage limit before the route executes, the swap can fail or refund. You may still lose gas. That is normal DeFi behavior, not something Rabby can prevent.

Click swap and approve the token if needed

  • Click “Swap” when the quote looks right.
    • If this is your first time using that token with the route, Rabby may ask you to approve USDC spending first.
    • The approval gives a contract permission to spend that token from your wallet.
    • Rabby should show the token, the spender, and the spending limit.
    • If the approval is unlimited or much larger than the swap amount, pause and decide whether you are comfortable with that.
    • After the approval confirms, return to prjx and continue the swap.

Approvals are one of the easiest places to get careless. A normal approval lets a DEX or bridge contract use the token you are swapping. A bad approval can let the wrong contract drain that token later.

Read Rabby’s signature insight before confirming

  • When Rabby opens, slow down and read the pre-transaction panel.
    • Look for the balance change preview. Rabby should show what token is leaving your wallet and what you are expected to receive.
    • Check the spender or contract name. For prjx bridge routes, Rabby may show a LI.FI contract on the source chain.
    • Review the gas estimate.
    • Look for any Rabby risk warnings. A warning does not always mean the swap is bad, but it does mean you should stop and understand it.
    • If the token, chain, contract, and amount look right, click “Confirm” in Rabby.

This is where Rabby is meaningfully better for beginners. It simulates the transaction and tries to show the likely result before you sign. That can help you catch the wrong chain, the wrong token, a strange spender, or a transaction that does not match what prjx showed on screen.

Use prjx as a bridge when the “to” chain is different

prjx is not just a same-chain swap app. If your “From” token is on Base and your “To” token is on HyperEVM, prjx treats the route as a cross-chain swap. Per the May 21, 2026 research brief, prjx routes these cross-chain swaps through LI.FI.

  • For a cross-chain swap, expect a few extra things.
    • The transaction may take longer than a normal same-chain swap.
    • The route may use a bridge provider behind LI.FI, such as Stargate, Across, Wormhole, deBridge, Hyperlane, Celer, Hop, or a native bridge.
    • The exact bridge depends on the route prjx and LI.FI choose.
    • You pay source chain gas and any bridge-related costs shown in the quote.
    • If the bridge fails or refunds, funds usually return on the source chain, minus gas.

A bridge has different trust assumptions than a simple same-chain DEX trade. You are not just swapping inside one pool. You are relying on the bridge route to move value from one chain to another. That does not mean “never use it.” It means you should read the route, start small, and avoid treating a bridge quote like an instant wallet transfer.

Why prjx is handy for Hyperliquid users

Hyperliquid users often need funds on HyperEVM. prjx can make that path simpler because the same screen can handle the source token, the destination chain, and the swap.

  • A beginner-friendly route looks like this:
    • Start with USDC on Base or Arbitrum in Rabby.
    • Open prjx.com.
    • Choose USDC on Base or Arbitrum in the “From” field.
    • Choose HYPE or USDC on HyperEVM in the “To” field.
    • Review the LI.FI route, estimated time, price impact, and network costs.
    • Approve the token if needed, then sign the bridge-and-swap transaction in Rabby.

The benefit is convenience. You do not need to manually bridge first, wait, open a second DEX, then swap again. The tradeoff is that you are trusting a newer prjx interface and the LI.FI bridge route underneath it. prjx is not as battle-tested as Uniswap, 1inch, or Matcha, and the research brief did not find public prjx audits or a public team page as of May 21, 2026.

Custom Gas Fees

In some cases you may need to increase your “gas” fee so that your transaction goes through faster.

How to confirm the swap worked

  • After the transaction confirms, check prjx, Rabby, and the block explorer.
    • prjx should show the route as completed.
    • Rabby should update your token balance on the destination chain.
    • If HYPE or USDC does not appear right away, switch Rabby to HyperEVM and refresh the token list.
    • You can also open the transaction hash on the source chain’s block explorer.
    • For cross-chain swaps, give the bridge time to finish before assuming something broke.

Congratulations, you just completed a prjx swap with Rabby.

Disclosure: this page contains a prjx referral link. If you trade through it, Easy as Pie DeFi may receive a referral benefit, at no extra cost to you.

Bottom line

prjx can be a useful shortcut when you want one app for swapping and bridging, especially if you are moving funds toward HyperEVM for Hyperliquid. Rabby does not remove DeFi risk, but its transaction preview gives you a better chance to catch the wrong chain, wrong token, strange approval, or suspicious contract before you sign.