Cross-chain · Polygon → Ethereum

Swap USDC from Polygon to USDT on Ethereum

Swap USDC from Polygon to USDT on Ethereum. Circle USDC leaves Polygon. Tether USDT is what can arrive on Ethereum. The issuer changes, and the gas coin on the far side is ETH.

Sell 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359, native Circle USDC on chain id 137. That is not USDC.e. Buy 0xdAC17F958D2ee523a2206206994597C13D831ec7, Tether on chain id 1. Polygon blocks are about 2 seconds. Ethereum blocks are about 12 seconds. Polygonscan shows the debit. Etherscan shows the credit. POL pays the source fee. Network notes are on Polygon.

Diagram for Swap USDC from Polygon to USDT on Ethereum
USDC leaves Polygon. USDT is what can arrive on Ethereum.

Native USDC is not the bridged copy

USDC.e at 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174 is the older bridged dollar on Polygon. This quote spends 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359. If the wallet shows USDC.e, you are on the wrong token. Polygonscan will show which contract the approval used.

Tether on Ethereum is not gas

0xdAC17F958D2ee523a2206206994597C13D831ec7 cannot pay Ethereum fees. You need ETH already on chain id 1 or the USDT sits still. This route does not deliver that ETH. A route that quotes native ETH is a different job.

Circle in, Tether out

Staying with Circle would mean Ethereum USDC at 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48. This page buys Tether instead. If a venue told you to deposit Circle USDC on Ethereum, this route is wrong even though both tokens target one dollar.

POL on the way out

Chain id 137 charges POL, the native coin, not USDC. The label for that gas is 0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE, and this quote does not sell it. Leave POL in the wallet. An approval of USDC plus the swap can be two transactions.

Legal

Risk disclosure

XAUConnect is a non-custodial swap aggregator. Digital assets are volatile and may lose value rapidly. Content on this page is educational and not investment advice. Verify every contract address on the official block explorer before approving a transaction.

Frequently asked questions

What is the best way to swap USDC from Polygon to USDT on Ethereum?

Sell 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359, native Circle USDC on chain id 137. That is not USDC.

I hold USDC.e. Is this the right contract?

No. USDC.e is 0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174. This route spends native Circle USDC at 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359 on chain id 137. Polygonscan shows the contract you approved. If the balance is the bridged copy, switch tokens before you sign. Native USDC and USDC.e are not one balance. Check Polygonscan before the allowance.

Will the USDT pay my Ethereum gas?

No. Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7 is not ETH. Chain id 1 charges ETH, and blocks there are about 12 seconds. That block time is not a finish time for the bridge. Keep ETH on Ethereum or the new USDT cannot move. About 12 second blocks are not a bridge finish time.

Where do I look up each side?

Polygonscan shows the Circle debit on chain id 137. Etherscan shows Tether at 0xdAC17F958D2ee523a2206206994597C13D831ec7. The pages do not share a balance. If you wanted Circle USDC on Ethereum instead, the contract is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 and this route is wrong. Tether is a different issuer. Do not deposit it where Circle was requested.

Live execution

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Open the swap page with this cross-chain route pre-selected, then connect your wallet on the source chain to quote and execute. You keep the keys.

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