Chapter 3: Chains, Bridges and Wrong Networks

Blockchains are separate networks

Ethereum, Polygon, BNB Chain, Arbitrum and others are separate environments. A token may exist on one network, on several networks, or as a bridged version. Choosing the wrong network is a common beginner mistake.

Stablecoin versions can differ

USDC, USDC.e and other stablecoin versions can look similar but behave differently. A pair may require one exact version on one exact chain. For Polygon swaps, the network and token version must match the pool.

Bridges add risk and waiting time

Bridges move value between chains, but they add extra steps, contracts and sometimes delays. They are useful tools, not invisible magic. Always check bridge source, destination, token version and fees.

Gas token matters

Every network needs its own gas token for transaction fees. On Polygon, users need POL for gas. Having USDC.e alone may not be enough to execute a swap.

The useful habit

Before sending funds, confirm chain, token version, receiving address and gas token. If any part is unclear, test with a small amount first.