Supported networks

LinkiSwap is currently a testnet demo. Everything works exactly as it will on mainnet, but the tokens are worthless — you're moving play money. This is intentional: it lets you try the whole flow safely.

Any pair of chains listed below can swap to any other. USDC is the common asset that always works cross-chain.

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Live today

Chain	Chain ID	Tokens
Optimism Sepolia	11155420	USDC, USDT
Base Sepolia	84532	USDC
Polygon Amoy	80002	USDC
Ethereum Sepolia	11155111	USDC

All four chains are connected all-to-all, so any of these are valid intents:

• USDC on OP Sepolia → USDC on Polygon Amoy
• USDC on Ethereum Sepolia → USDC on Base Sepolia
• USDT on OP Sepolia → USDC on Base Sepolia
• …and every other combination.

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How to add a chain to your wallet

Most wallets recognise these testnets natively. If yours doesn't, add them by hand:

Optimism Sepolia

• RPC URL: https://optimism-sepolia-rpc.publicnode.com
• Chain ID: 11155420
• Currency: ETH
• Explorer: https://sepolia-optimism.etherscan.io

Base Sepolia

• RPC URL: https://base-sepolia-rpc.publicnode.com
• Chain ID: 84532
• Currency: ETH
• Explorer: https://sepolia.basescan.org

Polygon Amoy

• RPC URL: https://polygon-amoy-bor-rpc.publicnode.com
• Chain ID: 80002
• Currency: POL
• Explorer: https://amoy.polygonscan.com

Ethereum Sepolia

• RPC URL: https://ethereum-sepolia-rpc.publicnode.com
• Chain ID: 11155111
• Currency: ETH
• Explorer: https://sepolia.etherscan.io

Or use chainlist.org — search the chain name, click Connect Wallet, and it will add itself.

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Where to get testnet gas

Testnet gas has no cost — you just need to grab some from a faucet.

Chain	Faucet
Optimism Sepolia	https://console.optimism.io/faucet
Base Sepolia	https://faucet.quicknode.com/base/sepolia
Polygon Amoy	https://faucet.polygon.technology (select Amoy + POL)
Ethereum Sepolia	https://cloud.google.com/application/web3/faucet/ethereum/sepolia

A single request gives you enough for dozens of swaps.

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Where to get testnet USDC

The USDC on these chains is not the real Circle USDC — it's a mock ERC-20 with a public mint function, deployed for LinkiSwap testing. You can:

1. Ask in the LinkiSwap community. The team can mint you a batch.
2. Mint your own if you're comfortable with a block explorer. Every USDC contract listed below has a mint(address, uint256) function you can call from Etherscan-style explorers. Six decimals: 1 USDC = 1_000_000 in the raw amount.

USDC contract addresses

Chain	USDC address
Optimism Sepolia	0x191688B2Ff5Be8F0A5BCAB3E819C900a810FAaf6
Base Sepolia	0x73c83DAcc74bB8a704717AC09703b959E74b9705
Polygon Amoy	0x8c1963bA445dd562Da0B6c6fbCa070921B3fa8E6
Ethereum Sepolia	0x8c1963bA445dd562Da0B6c6fbCa070921B3fa8E6

USDT (Optimism Sepolia only)

• USDT address: 0x8D13AE83C2D23518299bBbA47975731b88c844D8

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What isn't supported yet

You can type sentences involving mainnet chains and other tokens — the app will recognise them, but tell you they aren't executable. Today:

• Mainnet chains (Ethereum, Base, Optimism, Arbitrum, Polygon) — recognised, not live.
• Native ETH as an input — swaps must start from an ERC-20 (USDC or USDT).
• Solana and other non-EVM chains — recognised, not supported.
• ENS recipients (.eth names) — recognised, not supported. Use full 0x… addresses.
• Dollar amounts ($100) — not supported. Use token units.

Coverage grows over time. If a specific pair matters to you, let the team know.

→ Set up your wallet