Swap BNB on Polygon to WETH on Scroll

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What you need to know

BNB input identity and handling

BNB is classified as a native asset for this route. BNB uses a network-specific contract asset on Polygon. The recorded Polygon representation uses 18 decimal places. Native BNB can fund value and BSC gas, while tokenized BNB requires the source chain’s gas asset and contract handling.

From Polygon L1 into Scroll L2

Polygon source execution occurs on L1, while Scroll delivery occurs on a separate L2 ledger that settles to ethereum. POL pays source gas and ETH is the destination gas asset; identical-looking wallet addresses do not merge the balances or transaction histories.

WETH wrapped-token output check

WETH is a contract wrapper for ETH. It can be transferred as a token but cannot replace the native gas balance required by the network. On this route WETH is the destination token on Scroll. Its token balance, approvals, and contract transfer behavior are separate from the native coin used for network gas.

Scroll destination execution

Scroll is a L2 EVM network in the Ethereum ecosystem. ETH pays destination-side network gas on Scroll. EVM 0x account address A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll.

WETH output identity and receiving

WETH is classified as a wrapped asset for this route. WETH uses a wrapped contract asset on Scroll. The recorded Scroll representation uses 18 decimal places. WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas.

Polygon source execution

Polygon is a L1 EVM network in the Polygon ecosystem. POL pays source-side network gas on Polygon. EVM 0x account address A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1.

EVM-to-EVM execution boundary

Polygon and Scroll can use the same 0x address syntax, but they are separate networks with different chain identifiers, gas balances, token contracts, and transaction histories. The recorded settlement context includes ethereum, so L1 and L2 confirmation behavior should not be assumed identical.

Mistakes specific to BNB Polygon to WETH Scroll

Route-specific mistakes include sending on a network other than Polygon; using a destination that is not valid for Scroll; running out of POL before the source transaction is submitted; treating a wrapped token as the native gas asset. A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1. Native BNB can fund value and BSC gas, while tokenized BNB requires the source chain’s gas asset and contract handling. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll. WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas.

Private Route for BNB → WETH

Polygon wallet, token-transfer, contract, log, and gas activity remain public, and Scroll wallet, token-transfer, contract, log, and gas activity remain public. For this BNB on Polygon to WETH on Scroll path, Private Route is intended to reduce the direct visible relationship between activity around the source-side EVM 0x account address and destination-side EVM 0x account address; it does not hide either chain's public records.

  • Reduces the obvious link between the BNB deposit and WETH receipt
  • Compare standard and Private Route options for Polygon → Scroll
  • Shows what remains public on Polygon and Scroll before you deposit
Check Private Route availability →

Related routes

Swap BNB on Polygon to WETH on Scroll FAQs

What exactly leaves Polygon as BNB?

BNB is a contract representation on Polygon with 18 decimals at 0x5c4b7CCBF908E64F32e12c6650ec0C96d717f03F. POL, not BNB, pays gas unless both symbols are the same. A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1. Native BNB can fund value and BSC gas, while tokenized BNB requires the source chain’s gas asset and contract handling.

What exactly arrives on Scroll as WETH?

WETH is a contract representation on Scroll with 18 decimals at 0x5300000000000000000000000000000000000004. ETH, not WETH, pays gas unless both symbols are the same. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll. WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas.

Why does the BNB to WETH direction matter?

Native BNB can fund value and BSC gas, while tokenized BNB requires the source chain’s gas asset and contract handling. On receipt, WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas.

What changes between the source and destination asset roles?

BNB is the deposited native-asset input; WETH is the quoted token output. Source allowance or native-spend rules and destination wallet/representation checks are evaluated separately.

What should be matched before sending BNB?

Native BNB can fund value and BSC gas, while tokenized BNB requires the source chain’s gas asset and contract handling. A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll. WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas.

Can the wrapped asset pay native network gas?

No. WETH arrives as a token contract balance. It may need an explicit unwrap before becoming native ETH and cannot itself pay transaction gas. A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1. A Scroll receipt is an L2 native or contract balance whose proof settlement to Ethereum is a separate milestone; later activity uses ETH on Scroll.

What funds the Polygon source transaction?

POL is the native gas asset for Polygon. A Polygon PoS source uses its validator/checkpoint system and POL gas; its token contracts and checkpoints are separate from Ethereum L1. BNB is token-tracked and can need approval before transfer.

Can I swap BNB on Polygon to WETH on Scroll without KYC?

Requirements are checked for the live BNB Polygon to WETH Scroll quote. Verification requirements can depend on the provider, amount, jurisdiction, and current route. Sasquatch does not verify this route as universally no-KYC; check the live flow before continuing.

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